Step 1: The Beginning
Step 2: The Materials
Step 3: The Code
Step 4: The Assembly
Buttons
IR Sensor
Rotary Knob
Display
ESP32

Published August 18, 2023

Speaker System with ESP32

A speaker system that uses IOT technology to locally control it.

BeginnerShowcase (no instructions)4 hours3,019

Story

This project was directly from another creator by ResinChem. He goes much more in-depth into his procedure with a full article and video about it. All credit goes to him.

Article: https://resinchemtech.blogspot.com/2022/12/arylic-amp-mqtt.html

Video:

Step 1: The Beginning

This is my first real project with the help of my Dad. When summer started, I had another idea for a project that I wanted to work on (and still working on), which is an IOT birdhouse.

But my Dad wanted my help to expand his Home Assistant network, which already included the doorbell Ring display, measuring electricity usage throughout the house, locally controlling the washing machine, and many LED lights throughout the house. He controls all of that through his PC.

The next step was to create a speaker system that my Dad could use to play music, notify him if the washing machine was done, etc.

Step 2: The Materials

Here are the materials in order to make this.

From the article linked above

The main boards we'll be using are the Arylic Amp and ESP32.

The Arylic Amp is the main controller board dealing with the speakers. Taking in commands from the buttons, rotary knob, and ESP32.

Arylic Amp

The ESP32 is the controller board that deals with wifi and connecting to a central point to take information. It acts as the translator between the PC and Arylic Amp. I will give a deeper description of this later on.

ESP32

Step 3: The Code

ResGitHub's article has a GitHub page with multiple files. The main file called arylic_amp.ino is the file that's uploaded to the ESP32. It configures the ESP32 to connect to the wifi, establishes a connection with Home Assistant with MQTT (more on that later), and exchanges data both to and from each other.

Step 4: The Assembly

Before putting everything together and mashing it inside a box, we had to easily test and debug the components to see if they worked properly together. And to do that, we used breadboards and pin headers to easily connect wires to components.

Buttons

I first set up the button layout for the speaker system.

Shows buttons and IR sensor

There are 5 total buttons which include power on/off, volume up, volume down, mute, and mode switch. In the top right corner of the breadboard, the yellow wire is connected to the ground pin on the Arylic Amp board, while the white wire is connected to a pin called ADC_key.

ADC stands for Analog to Digital converter. Because there are multiple buttons connected to this circuit, the Arylic Amp board has to figure out which button is pressed. The board is programmed to recognize what button is pressed based on what voltage value the ADC_key pin measures. For each button, there are different values of resistors associated with it. And that means when one button is pressed, the resulting voltage is measured and the Arylic Amp board knows which function to carry out. This diagram from the manual shows what the Arylic Amp board knows which value it associates with what function.

Diagram that shows what buttons and resistors do what

Later on, we decided to only use 3 buttons for mode, mute, and power on/off (this one isn't listed here but ResinChem found it by accident).

IR Sensor

In the first picture, you can also see an IR sensor. It's connected to 3 pins on the Arylic Amp Board, which are ground, VCC, and IR.

The next parts we had to attach were the ESP32, rotary knob, and display.

Display, rotary knob, and ESP32

Rotary Knob

The rotary knob has 2 functions: changing the volume by rotating it, and switching screens on the display by pressing it. It has 5 pins in total; 2 of them tell the Arylic Amp board which direction it's rotating, the other two are the VCC and ground pins, and the final pin is the switch pin to know when the knob has been pressed. This GIF shows how the device knows which direction it's turning.

Display

The display's function is to show information to the user, such as current volume, current mode, mute and internet functionality, etc. Its pins include the normal VCC and ground pins, and 2 special pins called SDA and SCL. These pins are part of the I2C communication protocol. There are many kinds of communication protocols that let different components talk to each other and each one has its own uses and functionality. Other common protocols include UART and SPI.

The SDA pin stands for Serial Data. It's the connection that sends and receives data. The SCL pin stands for Serial Clock. It's the connection that regulates the time and speed for the data to be delivered.

All 4 of these pins of the display connected to the ESP32 itself and not the Arylic Amp.

ESP32

The main component that connects the Arylic Amp to Home Assistant is the ESP32. Home Assistant communicates to the ESP32 with an IOT communication protocol called MQTT (Message Queuing Telemetry Transport). An MQTT broker is set up in Home Assistant, which is just an interface for the user to send and receive data to whatever is connected. It's connected to the Arylic Amp for power as well as transmitting and receiving data from the buttons. The display and rotary knob are also connected to the ESP.

After connecting all the components together on a breadboard, there were a few debugging issues like not connecting the correct resistor or wire in the correct breadboard hole. But once everything worked as intended, we started finishing up this project.

The finishing test

The first step is taking this mess and soldering it onto a small solderable breadboard called an electrocookie. Here's what it looked like throughout the week.

My organized mess

After properly soldering everything together, the final step is fitting everything into a small container. We found one of our old Roku streaming players and used that to keep everything together.

We screwed on the small electrocookie board with the ESP32 and Arylic Amp board onto the bottom piece of the box (we had to use wood instead because we broke the bottom part of the original box while taking it apart).

It is not visible in this picture, but we cut out holes for the buttons, visual display, and rotary knob and attached it to the front side.

Top view: Speakers are connected to the green part

This is the finished project! We're really glad how it turned out. I was able to learn a lot from this from how microcontrollers work and communicate, to IOT communication and how to send and receive data. Something I'd like to try next time that adds on to this would be to connect the amp wirelessly to multiple speakers around the house and be able to use them individually or all together based on whatever task is done.

It works!!

Main Code Uploaded to ESP32

/*
 * Interface to Arylic Amp v4
 * Version: 0.28 - Add disable IR settings option to disable IR command processing due to rogue signals
 *               - Also added this as an MQTT command so it can be toggled from front end.
 * Last Update: 1/29/2023
 */
#include <WiFi.h>               
#include <ESPmDNS.h>              // https://github.com/espressif/arduino-esp32
#include <WebServer.h>           
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
#include <PubSubClient.h>
#include <FS.h>
#include <Wire.h>
#include <Adafruit_GFX.h>         // https://github.com/adafruit/Adafruit-GFX-Library
#include <Adafruit_SSD1306.h>     // https://github.com/adafruit/Adafruit_SSD1306
#include <IRremote.h>             // https://github.com/Arduino-IRremote/Arduino-IRremote
#include "Credentials.h"          // File must exist in same folder as .ino.  Edit as needed for project
#include "Settings.h"             // File must exist in same folder as .ino.  Edit as needed for project

//Display modes
#define SOURCE 1
#define VOLUME 2
#define TITLE 3
#define TRACK 4
#define MUTE 5
#define BLANK 6                  //BLANK should always be last in list so that button click 'wraps' from last item to first

//IR Commands 
struct IRCommands {
  uint16_t irCode;
  String uartCommand;
};

/* UPDATE COMMAND FOR YOUR REMOTE HERE:
   first value is the code returned, second value is the UART command to issue
   UART commands that only accept a numeric value (e.g treble, bass and balance), use ++ for increase and -- for decrease and 
   value will be increased or decreased by 1 within the permissible min/max values.
   Other commands may be added... just assure the UART command is valid.
*/
//==============================
IRCommands remoteCommands[] = {
  {16, "VOL:-;"},
  {17, "TRE:--;"},
  {18, "BAS:--;"},
  {19, "BAL:--;"},
  {20, "VOL:+;"},
  {21, "TRE:++;"},
  {22, "BAS:++;"},
  {23, "BAL:++;"},
  {65, "POP;"},  //toggles pause/play
  {64, "SYS:STANDBY;"},
  {68, "SRC:NET;"},
  {69, "SRC:BT;"},
  {88, "SRC:USB;"},
  {89, "SRC:USBDAC;"},
  {92, "MUT:T;"},  //toggles mute
  {93, "DISPMODE"}  //This is not a UART command, but local to change display home mode
};
//=============================

//GLOBAL VARIABLES
bool mqttConnected = false;       //Will be enabled if defined and successful connnection made.  This var should be checked upon any MQTT actin.
long lastReconnectAttempt = 0;    //If MQTT connected lost, attempt reconnenct
uint16_t ota_time = ota_boot_time_window;
bool initBoot = true;            // Used to hide OTA Update on display on initial boot
unsigned long currentMillis = 0;
unsigned long standbyTimer = 0;

//DISPLAY RELATED GLOBALS
byte dispMode = bootDispMode;    
byte prevdispMode = bootDispMode;
bool dispModeTempSource = true;
bool standbyMode = false;
unsigned long dispModeTemp_timer = 0;
String dispSource = "NET";
byte dispVolume = 50;
String dispMute = "OFF";
//Needed for IR remote command processing
int dispBass = 0;
int dispMidrange = 0;
int dispTreble = 0;
int dispBalance = 0;
String dispTitle = "N/A";
String dispTrack = "N/A";
String dispArtist = "N/A";
String dispAlbum = "N/A";

//BUTTON DEBOUNCE (Rotary knob click)
int dispBtnState;
int lastBtnState = HIGH;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 100;


//Setup Local Access point if enabled via WIFI Mode
#if defined(WIFIMODE) && (WIFIMODE == 0 || WIFIMODE == 2)
  const char* APssid = AP_SSID;        
  const char* APpassword = AP_PWD;  
#endif
//Setup Wifi if enabled via WIFI Mode
#if defined(WIFIMODE) && (WIFIMODE == 1 || WIFIMODE == 2)
  #include "Credentials.h"                    // Edit this file in the same directory as the .ino file and add your own credentials
  const char *ssid = SID;
  const char *password = PW;
#endif
//Setup MQTT if enabled - only available when WiFi is also enabled
#if (WIFIMODE == 1 || WIFIMODE == 2) && (MQTTMODE == 1)    // MQTT only available when on local wifi
  const char *mqttUser = MQTTUSERNAME;
  const char *mqttPW = MQTTPWD;
  const char *mqttClient = MQTTCLIENT;
  const char *mqttTopicSub = MQTT_TOPIC_SUB;
  //const char *mqttTopicPub = MQTT_TOPIC_PUB;
  //String strTopicPub = String(*mqttTopicPub);
#endif

WiFiClient espClient;
PubSubClient client(espClient);    
WebServer server;
//Define Display;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
//Setup IR Receiver
IRrecv irrecv(IR_RECV_PIN);
decode_results irresults;
  
// ============================================
//   MAIN SETUP
// ============================================
void setup() {
  // Serial monitor
  Serial.begin(115200);
  Serial.println("Booting...");
  //Serial communication to amp
  Serial2.begin(115200, SERIAL_8N1, RX_PIN, TX_PIN);
  Serial2.setTimeout(1000);

  //----------------
  //WiFi Connection
  //----------------
  WiFi.setSleep(false);  //Disable WiFi Sleep
  delay(200);
  // WiFi - AP Mode or both
#if defined(WIFIMODE) && (WIFIMODE == 0 || WIFIMODE == 2) 
  WiFi.hostname(WIFIHOSTNAME);
  WiFi.mode(WIFI_AP_STA);
  WiFi.softAP(APssid, APpassword);    // IP is usually 192.168.4.1
#endif
  // WiFi - Local network Mode or both
#if defined(WIFIMODE) && (WIFIMODE == 1 || WIFIMODE == 2) 
  byte count = 0;
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    // Stop if cannot connect
    if (count >= 60) {
      // Could not connect to local WiFi 
      Serial.println();
      Serial.println("Could not connect to WiFi.");     
      return;
    }
    delay(500);
    count++;
  }
  Serial.println();
  Serial.println("Successfully connected to Wifi");
  IPAddress ip = WiFi.localIP();
#endif   
  //-----------------------------------------
  // Setup MQTT - only if enabled and on WiFi  
  //-----------------------------------------
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
  byte mcount = 0;
  //char topicPub[32];
  client.setServer(MQTTSERVER, MQTTPORT);
  client.setCallback(callback);
  Serial.print("Connecting to MQTT broker.");
  while (!client.connected( )) {
    Serial.print(".");
    client.connect(mqttClient, mqttUser, mqttPW);
    if (mcount >= 60) {
      Serial.println();
      Serial.println("Could not connect to MQTT broker. MQTT disabled.");
      // Could not connect to MQTT broker
      return;
    }
    delay(500);
    mcount++;
  }
  mqttConnected = true;
  Serial.println();
  Serial.println("Successfully connected to MQTT broker.");
  client.subscribe(MQTT_TOPIC_SUB"/#");
  String outTopic = mqttTopicPub + "/mqtt";
  client.publish(outTopic.c_str(), "connected", true);
  //v0.28 - output initial IRMode status from settings since this isn't a UART command
  outTopic = mqttTopicPub + "/irmode";
  if (enableIR) {
    client.publish(outTopic.c_str(), "1");
  } else {
    client.publish(outTopic.c_str(), "0");
  }
#endif
  //-----------------------------
  // Setup OTA Updates
  //-----------------------------
  ArduinoOTA.setHostname(OTA_HOSTNAME);
  ArduinoOTA.onStart([]() {
    String type;
    if (ArduinoOTA.getCommand() == U_FLASH) {
      type = "sketch";
    } else { // U_FS
      type = "filesystem";
    }
    // NOTE: if updating FS this would be the place to unmount FS using FS.end()
  });
  ArduinoOTA.begin();
  // Setup handlers for web calls for OTAUpdate and Restart
  server.on("/restart",[](){
    server.send(200, "text/html", "<h1>Restarting...</h1>");
    delay(1000);
    ESP.restart();
  });
  server.on("/otaupdate",[]() {
    server.send(200, "text/html", "<h1>Ready for upload...<h1><h3>Start upload from IDE now</h3>");
    ota_flag = true;
    ota_time = ota_time_window;
    ota_time_elapsed = 0;
  });
  server.begin();

// ------------------------------------------------------
// Initialize Display and show splash screen for 2 seconds
// ------------------------------------------------------
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDR);
  display.display();
  delay(2000); // Pause for 2 seconds
  // Clear the buffer
  display.clearDisplay();
  // Set button (rotary know) for switching display mode
  pinMode(DISP_PIN, INPUT_PULLUP);
  // Set button for wake (wake from Standby - simulate button press)
  //pinMode(WAKE_PIN, OUTPUT);
  //digitalWrite(WAKE_PIN, LOW);  //Set to low
// Initialize IR Receiver
  irrecv.enableIRIn();  
  
  Serial.println("Staring main loop...");
  //Force status update
  Serial2.flush();
  Serial2.write("STA;");

 }

// =============================================================
// *************** MQTT Message Processing *********************
// =============================================================
void callback(char* topic, byte* payload, unsigned int length) {
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))

  payload[length] = '\0';
  String message = (char*)payload;
  String uartMsg;
  bool hasPayload = false;
  /*
   * Add any commands submitted here
   * Example:
   * if (strcmp(topic, MQTT_TOPIC_SUB"/mode")==0) {
   *   MyVal = message;
   *   Do something with MyVal
   *   return;
   * };
   */
  message.trim();
  if (message.length() > 0) {
    hasPayload = true;
  }
  //Amp control and commands (UART) 
  // These commands should be universal, regardless of current source
  if (strcmp(topic, MQTT_TOPIC_SUB"/source") == 0) {
    if (hasPayload) {
      uartMsg = "SRC:" + message + ";";
    } else {
      uartMsg = "SRC;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/system") == 0) {
    //Use these with caution!  Reset and recover could require reinitialization of your amp
    uartMsg = "SYS:" + message + ";";
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/wifireset") == 0) {
    Serial2.flush();
    Serial2.write("WRS;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/volume") == 0) {
    if (hasPayload) {
      uartMsg = "VOL:" + message + ";";
    } else {
      uartMsg = "VOL;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/mute")==0) {
    if (hasPayload) {
      uartMsg = "MUT:" + message + ";";
    } else {
      uartMsg = "MUT;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/bass") == 0) {
    if (hasPayload) {
      uartMsg = "BAS:" + message + ";";
    } else {
      uartMsg = "BAS;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/midrange") == 0) {
    if (hasPayload) {
      uartMsg = "MID:" + message + ";";
    } else {
      uartMsg = "MID:";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/treble") == 0) {
    if (hasPayload) {
      uartMsg = "TRE:" + message + ";";
    } else {
      uartMsg = "TRE;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/led") == 0) {
    if (hasPayload) {
      uartMsg = "LED:" + message + ";";
    } else {
      uartMsg = "LED;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/beep") == 0) {
    if (hasPayload) {
      uartMsg = "BEP:" + message + ";";
    } else {
      uartMsg = "BEP;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/voice") == 0) {
    if (hasPayload) {
      uartMsg = "PMT:" + message + ";";
    } else {
      uartMsg = "PMT;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/virtbass") == 0) {
    if (hasPayload) {
      uartMsg = "VBS:" + message + ";";
    } else {
      uartMsg = "VBS;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/pregain") == 0) {
    if (hasPayload) {
      uartMsg = "PRG:" + message + ";";
    } else {
      uartMsg = "PRG;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/balance") == 0) {
    if (hasPayload) {
      uartMsg = "BAL:" + message + ";";
    } else {
      uartMsg = "BAL;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/maxvol") == 0) {
    if (hasPayload) {
      uartMsg = "MXV:" + message + ";";
    } else {
      uartMsg = "MXV;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/poweronsource") == 0) {
    if (hasPayload) {
      uartMsg = "POM:" + message + ";";
    } else {
      uartMsg = "POM;";
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/preset") == 0) { 
    if (hasPayload) {
      uartMsg = "PST:" + message + ";";
    } else {
      uartMsg = "PST;";
    }
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/delay") == 0) {
    if (hasPayload) {
      uartMsg = "DLY:" + message + ";";
    } else {
      uartMsg = "DLY;";
    }
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/autoswitch") == 0) {
    if (hasPayload) {
      uartMsg = "ASW:" + message + ";";
    } else {
      uartMsg = "ASW;";
    }
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/syncvol") == 0) {
    if (hasPayload) {
      uartMsg = "VOS:" + message + ";";
    } else {
      uartMsg = "VOS;";
    }
    
  // These commands only work with certain sources (see documentation)
  } else if ((strcmp(topic, MQTT_TOPIC_SUB"/pause") == 0) || (strcmp(topic, MQTT_TOPIC_SUB"/play") == 0)) {
    Serial2.flush();
    Serial2.write("POP;");
    showTextParam("Command", "Pause/Play", 2);
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/stop") == 0) {
    Serial2.flush();
    Serial2.write("STP;");
    showTextParam("Command", "STOP", 3);
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/next") == 0) {
    Serial2.flush();
    Serial2.write("NXT;");
    showTextParam("Command", "NEXT", 3);
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/previous") == 0) {
    Serial2.flush();
    Serial2.write("PRE;");
    showTextParam("Command", "PREV", 3);
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/bluetooth") == 0) {
    if (hasPayload) {
      uartMsg = "BTC:" + message + ";";
    } else {
      uartMsg = "BTC;";  
    }
    Serial2.flush();
    Serial2.write(uartMsg.c_str());
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/loopmode") == 0) {
    uartMsg = "LPM:" + message + ";";
    Serial2.flush();
    Serial2.write(uartMsg.c_str());


  //Amp Status updates requests - these commands only request a state update, which will be published under related /stat topics
  //Any payloads are ignored
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/status") == 0) {
    Serial2.flush();
    Serial2.write("STA;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/version") == 0) {
    Serial2.flush();
    Serial2.write("VER;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/ethernet") == 0) {
    Serial2.flush();
    Serial2.write("ETH;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/wifi") == 0) {
    Serial2.flush();
    Serial2.write("WIF;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/internet") == 0) {
    Serial2.flush();
    Serial2.write("WWW;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/elapsed") == 0) {  //force elspsed time update (elapsed/total in msec)
    Serial2.flush();
    Serial2.write("ELP;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/playing") == 0) {
    Serial2.flush();
    Serial2.write("PLA;"); 
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/channel") == 0) {
    Serial2.flush();
    Serial2.write("CHN;");
  } else if (strcmp(topic,MQTT_TOPIC_SUB"/multiroom") == 0) {
    Serial2.flush();
    Serial2.write("MRM;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/audio") == 0) {
    Serial2.flush();
    Serial2.write("AUD;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/fixedvol") == 0) {
    Serial2.flush();
    Serial2.write("VOF;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/tracknum") == 0) {
    Serial2.flush();
    Serial2.write("PLI;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/devicename") == 0) {
    Serial2.flush();
    Serial2.write("NAM;");
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/network") == 0) {
    Serial2.flush();
    Serial2.write("NET;");
  //This final command just passed the payload directly as a UART message - payload must formatted properly, including trailing semi-colon
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/uart") == 0) {
    uartMsg = message;
    Serial2.flush();
    Serial2.write(uartMsg.c_str());

  //These are not UART commands, but other commands to enable/disable certain feature that are firmware only
  } else if (strcmp(topic, MQTT_TOPIC_SUB"/irmode") == 0) {
    if (hasPayload) {
      setIRMode(message.toInt());
    } else {
      setIRMode(99);  //just update status
    }
  }
#endif
};
// Reconnect to broker if connection lost (usually a result of a Home Assistant/broker/server reboot)
boolean reconnect() {
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
  if (client.connect(mqttClient, mqttUser, mqttPW)) {
    // Once connected, publish an announcement...
    String outTopic = mqttTopicPub + "/mqtt";
    client.publish(outTopic.c_str(), "connected", true);
    // ... and resubscribe
    client.subscribe(MQTT_TOPIC_SUB"/#");
  }
  return client.connected();
#endif
}

// ===============================================================
//   MAIN LOOP
// ===============================================================
void loop() {
  //Handle OTA updates when OTA flag set via HTML call to http://ip_address/otaupdate

  if (ota_flag) {
    if (initBoot) {
      initBoot = false;
    } else {
      showOTAUpdate();
    }
    uint16_t ota_time_start = millis();
    while (ota_time_elapsed < ota_time) {
      ArduinoOTA.handle();  
      ota_time_elapsed = millis()-ota_time_start;   
      delay(10); 
    }
    ota_flag = false;
  }
  //Handle any web calls
  server.handleClient();

  // Reconnect to MQTT if enabled and not connected
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
    if (!client.connected()) {
      long now = millis();
      if (now - lastReconnectAttempt > 60000) {   //attempt reconnect once per minute. Drop usually a result of Home Assistant/broker server restart
        lastReconnectAttempt = now;
        // Attempt to reconnect
        if (reconnect()) {
          lastReconnectAttempt = 0;
        }
      }
    } else {
      // Client connected
      client.loop();
    }
#endif
  // Process IR if enabled
  if (enableIR) {
  //Look for IR Code Received if enabled
    if (irrecv.decode()) {
    
      uint16_t ir_code = irrecv.decodedIRData.command;
      processIRCommand(ir_code);
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
    client.publish(MQTT_TOPIC_PUB"/ircode", String(ir_code).c_str(), true);
#endif
      delay(250);

      irrecv.resume();
    }
  }
  //Rotary Knob Click Process
  currentMillis = millis();
  int curBtnState = digitalRead(DISP_PIN);
  //Debounce
  if (curBtnState != lastBtnState) {
    lastDebounceTime = currentMillis;
  }

  if ((currentMillis - lastDebounceTime) > debounceDelay) {
    if (curBtnState != dispBtnState) {
      dispBtnState = curBtnState;
    
      if (dispBtnState == LOW) {
        if (dispMode == BLANK) {
          dispMode = 1;
        } else {
         dispMode ++;
        }
        prevdispMode = dispMode;
      }  
    }
  }
  lastBtnState = curBtnState;
  
  if (standbyMode && (currentMillis < standbyTimer)) {  //Don't process incoming data for 5 seconds after putting in standby (keeps display off)
    if (Serial2.available() > 0) {
      String ignoreData = Serial2.readStringUntil('\n');
    }
  } else {
    if (Serial2.available() > 0) {
      standbyMode = false;
      String ampData = Serial2.readStringUntil('\n');
      ampData.trim();
      //Handle power down of display when amp reports SYS:STANDBY
      if (ampData.indexOf("STANDBY") > 0) {
        while (Serial2.available() > 0) {
          ampData  = Serial2.readStringUntil('\n');
          delay(500);
        }
        display.clearDisplay();
        display.display(); 
        standbyMode = true;
        standbyTimer = currentMillis + 5000;
        //Publish message with source of STANDBY
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
        client.publish(MQTT_TOPIC_PUB"/source", "STANDBY", true);
#endif
      } else { 
        standbyMode = false;
        updateMQTT(ampData);
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
        client.publish(MQTT_TOPIC_PUB"/uart", ampData.c_str(), true);
#endif
      }
    }
  }
  //Update display
  if (!standbyMode) {
    if (currentMillis > (dispModeTemp_timer + dispTempDisplay_duration)) {
      switch (dispMode) {
        case SOURCE:
          showSource();
          break;
        case VOLUME:
          //showVolume();
          showNumberParam("Volume", dispVolume);
          break;
        case MUTE:
          showMute();
           break;
        case TITLE:
          //showTitle();
          showTextParam("Title", dispTitle, 2);
          break;
        case TRACK:
          //showTrack();
          showTextParam("Track Num", dispTrack, 3);
          break;
        default:
          display.clearDisplay();
          display.display(); 
          break;
      }
      dispModeTemp_timer = 0;
      dispModeTempSource = false;
    }
  }  
}

// ====================================
//  Misc Functions
// ====================================
// This is needed to UART Hex-returned values (NAM, TIT, ART, ALB)
String hexToAscii( String hex )
{
  uint16_t len = hex.length();
  String ascii = "";

  for ( uint16_t i = 0; i < len; i += 2 )
    ascii += (char)strtol( hex.substring( i, i+2 ).c_str(), NULL, 16 );
    
  return ascii;
}

// --------------------------------
//  Handle enable/disable custom IR
//    (since this is not a UART command)
//  Updates both MQTT and display
// ---------------------------------
void setIRMode(byte statcode) {
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
  String topic = mqttTopicPub + "/irmode";
  String payload = "0";
  //If stat code > 0, enable IR otherwise disable
  if (statcode > 0) {
    enableIR = 1;
    payload = "1";
  } else if (statcode == 0) {
    enableIR = 0;
    payload = "0";    
    //Clear last retained IR code (if any)
    client.publish((mqttTopicPub + "/ircode").c_str(), "0", true);
  }
  client.publish(topic.c_str(), payload.c_str(), true);
  showBooleanParam("IR Recvr", enableIR);

#endif
}

// -------------------------
// Process IR codes received
// -------------------------
void processIRCommand(uint16_t ircode) {
  for (int i=0; i<sizeof remoteCommands/sizeof remoteCommands[0]; i++) {

    if (remoteCommands[i].irCode == ircode) {
      String tempCmd = remoteCommands[i].uartCommand;

      //Must handle commands that expect a numeric value and won't accept "+" or "-".. and validate range
      //Treble
      if (tempCmd.startsWith("TRE:--")) {
        if (dispTreble > -10) {
          tempCmd.replace("--", String(dispTreble - 1));
        } else {
          tempCmd = "TRE:-10;";
        }
      } else if (tempCmd.startsWith("TRE:++")) {
        if (dispTreble < 10) {
           tempCmd.replace("++", String(dispTreble + 1));   
        } else {
          tempCmd = "TRE:10;";
        }
     //Bass
     } else if (tempCmd.startsWith("BAS:--")) {
        if (dispBass > -10) {
          tempCmd.replace("--", String(dispBass - 1));
        } else {
          tempCmd = "BAS:-10;";
        }
     } else if (tempCmd.startsWith("BAS:++")) {
        if (dispBass <  10) {
          tempCmd.replace("++", String(dispBass + 1));
        }
     //Balance (-100 to 100)   
     } else if (tempCmd.startsWith("BAL:--")) {
       if (dispBalance > -100 ) {
        tempCmd.replace("--", String(dispBalance - 1));
       } else {
        tempCmd = "BAL:-100;";
       }
     } else if (tempCmd.startsWith("BAL:++")) {
       if (dispBalance < 100) {
         tempCmd.replace("++", String(dispBalance + 1));
       } else {
        tempCmd = "BAL:100";
       }
     }

     if (tempCmd == "DISPMODE") {
       //this is a local command, not a UART command. Increase display mode by 1
        if (dispMode == BLANK) {
          dispMode = 1;
        } else {
          dispMode ++;
        }
        prevdispMode = dispMode;
       
       break; 
     } else {
        Serial2.flush();
        //Serial2.write((remoteCommands[i].uartCommand).c_str());
        Serial2.write(tempCmd.c_str());
        //Update display for those commands that do not return a UART value
        if (tempCmd == "POP;") {
          showTextParam("Command", "Pause/Play", 2);
        } else if (tempCmd == "STP;") {
          showTextParam("Command", "STOP", 3);
        } else if (tempCmd == "NXT;") {
          showTextParam("Command", "NEXT", 3);
        } else if (tempCmd == "PRE;") {
          showTextParam("Command", "PREV", 3);
        }
        break; 
     }
    }
  }
}

// ====================================
//  MQTT Message Processing
// ===================================
void updateMQTT(String uartData) {
  //Incoming data may be a single value or a list of semi-colon delimited values
  //All data returned consists of a three character topic, followed by a colon and the value
  //This proc also calls the process to update the display, so it should remain enabled even if MQTT disabled
  int dataLen = uartData.length();
  int intSemiPos = uartData.indexOf(';');
  int intLastPos = 0;
  String strTopic;
  String strMessage;
  String uartTopic;
  if (dataLen > 0) {
    uartTopic = uartData.substring(0,3);
    if (uartTopic == "STA") {
      //Must handle differently to split multiple values
      updateAmpStatus(uartData);
    } else {  
      while (intSemiPos > 0) {
        if ((uartTopic == "NAM")) {  //hexed value - must convert to ASCII
          strMessage = hexToAscii(uartData.substring(4, intSemiPos));
         } else if ((uartTopic == "CHN") || (uartTopic == "MRM")) {
          strMessage = decodeUartValue(uartTopic, uartData.substring(4, intSemiPos));
        } else {
          strMessage = uartData.substring(4, intSemiPos);           //UART value/response 
        }
        strTopic = mqttTopicPub + "/" + getFriendlyTopic(uartTopic, strMessage);  //Get friendly name from UART message (topic)
        
       // strMessage = uartData.substring(4, intSemiPos);           //UART value/response
#if defined(MQTTMODE) && (MQTTMODE == 1 && (WIFIMODE == 1 || WIFIMODE == 2))
        client.publish(strTopic.c_str(), strMessage.c_str(), true);
#endif
        intLastPos = intSemiPos + 1;
        intSemiPos = uartData.indexOf(';', intLastPos);
      }  
    }
  }
}

String getFriendlyTopic(String uartTopic, String uartValue) {
  //Gets friendly/topic name for MQTT Publish
  //Also updates display where applicable
  String outVal="unknown";
  String dispVal = "?";
  if (uartTopic == "VER") {
    outVal = "version";
    showTextParam("Version", uartValue, 2);
  } else if (uartTopic == "WWW") {
    outVal = "internet";
    //dispWWWconn = uartValue.toInt();
    showBooleanParam("Internet", uartValue.toInt());
  } else if (uartTopic == "AUD") {
    outVal = "audio";
    //dispAudio = uartValue.toInt();
    showBooleanParam("Audio", uartValue.toInt());
  } else if (uartTopic == "SRC") {
    outVal = "source";
    dispSource = uartValue;
    showSource();
  } else if (uartTopic == "VOL") {
    outVal = "volume";
    dispVolume = uartValue.toInt();
    showNumberParam("Volume", dispVolume);
    //showVolume();
  } else if (uartTopic == "MUT") {
    outVal = "mute";
    if (uartValue == "1") {
      dispMute = "ON";
      dispMode = MUTE;
    } else {
      dispMute = "OFF";
      dispMode = prevdispMode;
    }
    showMute();
  } else if (uartTopic == "BAS") {
    outVal = "bass";
    dispBass = uartValue.toInt();
    showNumberParam("Bass", dispBass);
  } else if (uartTopic == "MID") {
    outVal = "midrange";
    dispMidrange = uartValue.toInt();
    showNumberParam("Midrange", dispMidrange);
  } else if (uartTopic == "TRE") {
    outVal = "treble";
    dispTreble = uartValue.toInt();
    showNumberParam("Treble", dispTreble);
  } else if (uartTopic == "BTC") {
    outVal = "btconnect";
    //dispBTconn = uartValue.toInt();
    showBooleanParam("Bluetooth", uartValue.toInt());
  } else if (uartTopic == "PLA") {
    outVal = "playing";
    showBooleanParam("Playing", uartValue.toInt());
  } else if (uartTopic == "CHN") {
    outVal = "channel";
    showTextParam("Channel", uartValue, 2);
  } else if (uartTopic == "MRM") {
    outVal = "multiroom";
    showTextParam("Multi-room", uartValue, 2);
  } else if (uartTopic == "LED") {
    outVal = "led";
    //dispLED = uartValue.toInt();
    showBooleanParam("LED", uartValue.toInt());
  } else if (uartTopic == "BEP") {
    outVal = "beep";
    //dispBeep = uartValue.toInt();
    showBooleanParam("Key Beep", uartValue.toInt());
  } else if (uartTopic == "VBS") {
    outVal = "virtbass";
    //dispVirtbass = uartValue.toInt();
    showBooleanParam("Virt. Bass", uartValue.toInt());
  } else if (uartTopic == "LPM") {
    outVal = "loopmode";
    //dispLoopmode = uartValue;
    showTextParam("Loop mode", uartValue, 2);
  } else if (uartTopic == "NET") {
    outVal = "network";
    //dispNetwork = uartValue.toInt();
    showBooleanParam("Network", uartValue.toInt());
  } else if (uartTopic == "ETH") {
    outVal = "ethernet";
    //dispETHconn = uartValue.toInt();
    showBooleanParam("Ethernet", uartValue.toInt());
  } else if (uartTopic == "WIF") {
    outVal = "wifi";
    //dispWIFIconn = uartValue.toInt();
    showBooleanParam("WIFI", uartValue.toInt());
  } else if (uartTopic == "PMT") {
    outVal = "voice";
    //dispVoice = uartValue.toInt();
    showBooleanParam("Voice Pmpt", uartValue.toInt());
  } else if (uartTopic == "PRG") {
    outVal = "pregain";
    //dispPregain = uartValue.toInt();
    showBooleanParam("Pregain", uartValue.toInt());
  } else if (uartTopic == "DLY") {
    outVal = "delay";
    showNumberParam("Delay", uartValue.toInt());
  } else if (uartTopic == "MXV") {
    outVal = "maxvol";
    //dispMaxvol = uartValue.toInt();
    showNumberParam("Max. Vol", uartValue.toInt());
  } else if (uartTopic == "ASW") {
    outVal = "autoswitch";
    showBooleanParam("Auto-switch", uartValue.toInt());
  } else if (uartTopic == "POM") {
    outVal = "poweronsource";
    //dispPOM = uartValue;
    showTextParam("PowerOn Scr", uartValue, 2);
  } else if (uartTopic == "VND") {
    outVal = "vendor";
    showTextParam("Vendor", uartValue, 2);
  } else if (uartTopic == "ELP") {
    outVal = "elasped";
    showTextParam("Elaspsed", uartValue, 2);
  } else if (uartTopic == "VOS") {
    outVal = "syncvol";
    showBooleanParam("Vol Sync", uartValue.toInt());
  } else if (uartTopic == "BAL") {
    outVal = "balance";
    dispBalance = uartValue.toInt();
    showNumberParam("Balance", dispBalance);
    //showBalance();
  } else if (uartTopic == "VOF") {
    outVal = "fixedvol";
    showBooleanParam("Fixed Vol", uartValue.toInt());
  } else if (uartTopic == "PLI") {
    outVal = "tracknum";
    dispTrack = uartValue;
    showTextParam("Track Num", dispTrack, 2);
    //showTrack();
  } else if (uartTopic == "PST") {
    outVal = "preset";
    showNumberParam("Preset", uartValue.toInt()); 

  } else if (uartTopic == "NAM") {
    outVal = "devicename";
    showTextParam("Device name", uartValue, 2);
  } else if (uartTopic == "TIT") {
    outVal = "title";
    dispTitle = uartValue;
    showTextParam("Title", dispTitle, 2);
  } else if (uartTopic == "ART") {
    outVal = "artist";
    showTextParam("Artist", uartValue, 2);
  } else if (uartTopic == "ALB") {
    outVal = "album";
    showTextParam("Album", uartValue, 2);
  } else {
    outVal = uartTopic;
  }

  return outVal;
}

String decodeUartValue(String uartTopic, String uartCode) {
  String retVal;
  if (uartTopic == "CHN") {
    if (uartCode == "S") {
      retVal = "Stereo";
    } else if (uartCode = "L") {
      retVal = "Left";
    } else if (uartCode = "R") {
      retVal = "Right";
    } else {
      retVal = "Unknown";
    }
  } else if (uartTopic == "MRM") {
...

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Credits

Ryne Gonzales

1 project • 2 followers

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Speaker System with ESP32

Speaker System with ESP32

Story

Step 1: The Beginning

Step 2: The Materials

Step 3: The Code

Step 4: The Assembly

Buttons

IR Sensor

Rotary Knob

Display

ESP32

Code

Main Code Uploaded to ESP32

Credits

Ryne Gonzales

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