LED panel

We made an LED panel that reacts to temperature, force, and sound.

BeginnerFull instructions provided6 hours163

Things used in this project

Hardware components

Adafruit 32x32 RGB LED Matrix Panel

Temperature Sensor

Adafruit Microphone Amplifier Breakout

Adafruit Flora RGB Neopixel LEDs- Pack of 4

Software apps and online services

Particle Build Web IDE

Google Sheets

Google Cloud IoT Core

Story

We decided on doing an LED panel after seeing different music reactive LED strips. We needed to use 3 sensors so we decided on force, sound, and temperature. The temperature sensor determines the color of the LEDs. The sound sensor will determine how many LEDs light up. The force sensor or the sound sensor can trigger the panel to light up.

https://docs.google.com/spreadsheets/d/1HLJV2XOispPV1r-BNjhlJH9Oi75WmgmERAm0RoevHIc/edit?usp=sharing

^^This is the google spreadsheet where data is logged^^

In the youtube video a potentiometer was used to simulate noise changes. In the code the LED dimming is based off of a percentage of max sensor value which is configured at the beginning of the code.

This wiring configuration uses a 32x32 LED Panel instead of a dual LED.

This is the dual LED wiring configuration

Code

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT_Particle.h>

#define DHTPIN A0
#define DHTTYPE DHT11
#define SNDPIN A1
#define FRCPIN A2
#define R1PIN D3
#define B1PIN D4
#define R2PIN D5
#define B2PIN D6
#define UPDATE 500ms

//Change this to the max expected value of sound input
float soundMax = 4096;
//Change this to the max expected value of force input
float forceMax = 4096;

DHT dht(DHTPIN, DHT11, 8);

void setup() {
    Particle.publish("Testing logging");

    dht.begin();
    
    pinMode(SNDPIN, INPUT);
    
    pinMode(FRCPIN, INPUT);
    
    pinMode(R1PIN, OUTPUT);
    pinMode(B1PIN, OUTPUT);
    pinMode(R2PIN, OUTPUT);
    pinMode(B2PIN, OUTPUT);
}

void loop() {
    int temp = dht.getTempCelcius();     // read temperature
    
    Particle.publish("Temperature", String(temp));
    
    int sound = analogRead(SNDPIN);
    
    Particle.publish("Sound", String(sound));
    
    int force = analogRead(FRCPIN);
    
    Particle.publish("Force", String(force));
    
    String out = String::format("{\"temperature\":%d,\"sound\":%d,\"force\":%d}",temp, sound, force);
    
    //Posts to a webhook linked to a google webapp script
    Particle.publish("blob", out , PRIVATE, WITH_ACK);
    
    float soundFactor = sound/soundMax;
    float forceFactor = force/forceMax;
    
    setRB(soundFactor * (temp*10), soundFactor * (255 - (temp*10)), R1PIN, B1PIN);
    
    delay(UPDATE);
    
    setRB(forceFactor * (temp*10), forceFactor * (255 - (temp*10)), R2PIN, B2PIN);
    
    delay(UPDATE);
}

void setRB(int red, int blue, int pinR, int pinB) {
    if(red < 0) {
        red = 0;
    }
    if(red > 255) {
        red = 255;
    }
    if(blue < 0) {
        blue = 0;
    }
    if(blue > 255) {
        blue = 255;
    }
    analogWrite(pinR, red);
    analogWrite(pinB, blue);
}

function doPost(e) {

  //Return if null
  if( e == undefined ) {
    Logger.log("no data");
    return HtmlService.createHtmlOutput("need data");
  }

  //Parse the JSON data
  var event = JSON.parse(e.postData.contents);
  var data = JSON.parse(event.data);

  //Get the last row without data
  var sheet = SpreadsheetApp.getActiveSheet();
  var lastRow = Math.max(sheet.getLastRow(),1);
  sheet.insertRowAfter(lastRow);

  //Get current timestamp
  var timestamp = new Date();

  //Insert the data into the sheet
  sheet.getRange(lastRow + 1, 1).setValue(event.published_at);
  sheet.getRange(lastRow + 1, 2).setValue(data.temperature);
  sheet.getRange(lastRow + 1, 3).setValue(data.sound);
  sheet.getRange(lastRow + 1, 4).setValue(data.force);

  SpreadsheetApp.flush();
  return HtmlService.createHtmlOutput("post request received");
}

Credits

Alyson Witte

1 project • 3 followers

Jordon Waters

1 project • 3 followers

Thanks to Yazeed Hawari.

LED panel