IoT Smart Wallet (with Firebeetle ESP32 and Arduino IDE)

// ----------------------------
// Add libraries
// ----------------------------
#include <WiFi.h>             // Library for Wi-Fi
#include <WiFiMulti.h>        // Library for multiple Wi-Fi connections
#include <WiFiClientSecure.h> // Library for creating a https client
#include <ArduinoJson.h>      // Library for reading data from json
#include <Wire.h>             // Library for I2C communication to OLED display
#include "esp_deep_sleep.h"   // Library for ESP32 deep sleep
#include "SH1106.h"           // Library for OLED display (https://github.com/squix78/esp8266-oled-ssd1306)

// ----------------------------
// Configurations
// ----------------------------

const char* ssid1     = "XXXXXX";    // Wi-Fi router SSID
const char* password1 = "YYYYYY"; // Wi-Fi router  password

const char* ssid2     = "XXXXXX";       // Wi-Fi rounter SSID
const char* password2 = "YYYYYY";   // Wi-Fi router password

String spreadSheetID = "ZZZZZZ";  // ID from Google spreadsheet
String key = "?key=WWWWWW";            // Google API key

const size_t bufferSize = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(5) + JSON_OBJECT_SIZE(3) + 100;  // buffer for json message

#define SCL_PIN D5 // ESP32 pin connected to OLED display SCL pin
#define SDA_PIN D3 // ESP32 pin connected to OLED display SDA pin

#define Threshold 400   // Touch sensor sensitivity



// ----------------------------

String getString = "GET /v4/spreadsheets/" + spreadSheetID + "/values/"; 

WiFiMulti WiFiMulti;

WiFiClientSecure wificlient; // Create https client

SH1106 display(0x3c, SDA_PIN, SCL_PIN); // Start OLED display
  
RTC_DATA_ATTR int bootCount = 0; // Store boot count


// ----------------------------
// Setup
// ----------------------------

void setup() {

  Serial.begin(115200); // Start serial communication

  // Initialising the display
  display.init();
  display.clear();
  display.displayOn();
  display.flipScreenVertically();
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_16);
  display.drawString(64, 0, F("IoT wallet"));
  display.setFont(ArialMT_Plain_10);
  display.drawString(64, 18, F("By igorF2"));
  display.display();

  delay(500);

  // Increment boot number and print it every reboot
  ++bootCount;
  Serial.println("Boot number: " + String(bootCount));
  
  Connect_to_Wifi(); // Connect Wi-Fi network
  delay(100);

  touchAttachInterrupt(T0, callback, Threshold);  // Enable touch sensor wake up
  esp_deep_sleep_enable_touchpad_wakeup();        // Enable touch sensor wake up

  btStop(); // Turn off bluetooth for saving battery
}



// ----------------------------
// Main Loop
// ----------------------------

void loop() {

  Serial.println("Reading Google Spreadsheet data...");
  readGoogleSheet(); // Read Google Sheet data and display on OLED display

  Serial.println("Going to sleep now...");
  display.displayOff();
  esp_deep_sleep_start(); // Start sleeping
  WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery

  
}

// ----------------------------


// ----------------------------
// Auxiliary functions
// ----------------------------

// Connect Wi-Fi network
void Connect_to_Wifi()
{

  // We start by connecting to a WiFi network
  WiFiMulti.addAP(ssid1, password1);
  WiFiMulti.addAP(ssid2, password2);

  Serial.println();
  Serial.print("Wait for WiFi... ");

  String displayText = "connecting";
  while (WiFiMulti.run() != WL_CONNECTED) {
    Serial.print(".");
    displayText += ".";
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 0, displayText);
    delay(100);
  }

  // Display IP if connection successful
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

}


// Executed when touch sensor activated
void callback(){
  // placeholder callback function
  
  Serial.println("touch");
  //WiFi.mode(WIFI_ON); //turn off WiFi for saving battery
}


// Read Google Spreadsheet values and update OLED display
void readGoogleSheet(){
  boolean empty = false; // identifies if the last entry of the spreadsheet was read
  int row = 2; // row of the spreadsheet to be read
  while (!empty) {
    if (wificlient.connect("sheets.googleapis.com", 443) == true) // Try to connect Google APIs server at port 443 (https)
    {
        String toSend = getString; // GET string to be sent (columns from A to E)
        toSend += "A";
        toSend += row;
        toSend += ":";
        toSend += "E";
        toSend += row;
        
        // Cells to be read from the spreadsheet
        toSend += key; // Add API key
        toSend += " HTTP/1.1"; // End of GET instruction

        wificlient.println(toSend); // Send GET to server
        wificlient.println("Host: sheets.googleapis.com");
        wificlient.println();

        // Check HTTP status
        char status[32] = {0};
        wificlient.readBytesUntil('\r', status, sizeof(status));
        if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
          Serial.print(F("Unexpected response: "));
          Serial.println(status);
          return;
        }

        // Skip HTTP headers
        char endOfHeaders[] = "\r\n\r\n";
        if (!wificlient.find(endOfHeaders)) {
          Serial.println(F("Invalid response"));
          return;
        }
        wificlient.readBytesUntil('\r', status, sizeof(status));

        // Create buffer
        DynamicJsonBuffer jsonBuffer(bufferSize);

        // Store values and convert to float
        JsonObject& root = jsonBuffer.parseObject(wificlient);
        String currency = root["values"][0][0];
        String amountStr = root["values"][0][1];
        String tickerStr = root["values"][0][2];
        String valueStr = root["values"][0][3];
        String changeStr = root["values"][0][4];
        float amount = amountStr.toFloat();
        float ticker = tickerStr.toFloat();
        float value = valueStr.toFloat();
        float change = changeStr.toFloat();

        // Update display
        if (currency != "") {
          Serial.println("Response:");
          Serial.println(currency);
          Serial.println(amount);
          Serial.println(ticker);
          Serial.println(value);
          Serial.println(change);

          display.clear();
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.setFont(ArialMT_Plain_10);
          display.drawString(64, 0, String(amount) + currency);
          display.setFont(ArialMT_Plain_16);
          display.drawString(64, 20, String(value,2) + "BRL");
          display.setFont(ArialMT_Plain_10);
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.drawString(64, 48, String(ticker,2) + "BRL"+"/"+currency+" ("+change+")");
          display.display();
        }
        else {
          empty = true;
        }
        wificlient.stop();  // Stop connection to the server
      }
      else
      {
        Serial.println("Connection failured");
      }
      row++;
    }
}

// ----------------------------
// Add libraries
// ----------------------------
#include <WiFi.h>             // Library for Wi-Fi
#include <WiFiMulti.h>        // Library for multiple Wi-Fi connections
#include <WiFiClientSecure.h> // Library for creating a https client
#include <ArduinoHttpClient.h>// Library for crating a http client
#include <ArduinoJson.h>      // Library for reading data from json
#include <Wire.h>             // Library for I2C communication to OLED display and Accelerometer
#include "SH1106.h"           // Library for OLED display (https://github.com/squix78/esp8266-oled-ssd1306)


// ------------------------------------------------------------------------------------
// Configurations
// ------------------------------------------------------------------------------------
// The following will have to be updated according to your hardware and accounts
// ------------------------------------------------------------------------------------

// Wi-Fi network
const char* ssid1     = "XXXXXX";    // Wi-Fi router SSID
const char* password1 = "YYYYYY"; // Wi-Fi router  password
const char* ssid2     = "XXXXXX";       // Wi-Fi rounter SSID
const char* password2 = "YYYYYY";   // Wi-Fi router password

// Hardware
#define SCL_PIN D5 // ESP32 pin connected to OLED display SCL pin
#define SDA_PIN D3 // ESP32 pin connected to OLED display SDA pin

// Google API
String spreadSheetID = "ZZZZZZ";  // ID from Google spreadsheet
String key = "?key=WWWWWW";            // Google API key
const size_t bufferSize = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(5) + JSON_OBJECT_SIZE(3) + 100;  // buffer for json message
String getString = "GET /v4/spreadsheets/" + spreadSheetID + "/values/"; 

// Other
#define Threshold 400   // Touch sensor sensitivity
#define TIMEZONE  3 // Current time zone. Used for correction of server time

// ----------------------------

// ----------------------------
// Global variables
// ----------------------------

// Time
String TimeDate = ""; // Variable used to store the data received from the server
int hours; // Current hour
int minutes; // Current minute
int seconds; // Current second
int seconds0;

// WiFi
WiFiMulti WiFiMulti;
WiFiClientSecure wificlient; // Create https client

// Display
SH1106 display(0x3c, SDA_PIN, SCL_PIN); // Start OLED display

// Flags
boolean googleIt = false;

// Quotes
String array[] = { 
  "The safe way to double\nyour money is to fold it\nover once and put it in\nyour pocket\n- Kin Hubbard", 
  "Be saving, but not at the\ncost of all liberality. Have\nthe soul of a king and the\nhand of a wise economist.\n- Joseph Joubert",
  "Look everywhere you can\nto cut a little bit from your\nexpenses. It will all add up\nto a meaningful sum.\n- Suze Orman", 
  "The quickest way to\ndouble your money is to\nfold it in half and put it in\nyour back pocket.\n- Will Rogers",
  "A budget is telling your\nmoney where to go instead\nof wondering where it went\n- John C. Maxwell",
  "You must learn to save\nfirst and spend afterwards.\n- John Poole",
  "Balancing your money is\nthe key to having enough.\n- Elizabeth Warren",
  "Saving must become a\npriority, not just a thought.\nPay yourself first.\n- Dave Ramsey",
  "By definition, saving for\nanything requires us to not\nget things now so that we\ncan get bigger ones later.\n- Jean Chatzky",
  "The art is not in making\nmoney, but in keeping it.\n- Anonymous",
  "He who will not economize\nwill have to agonize.\n- Confucius",
  "The easiest way to save\nmoney is to waste less\nenergy.\n- Barack Obama",
  "A simple fact that is hard\nto learn is that the time to\nsave money is when you\nhave some.\n- Joe Moore",
  "Saving is a very fine thing.\nEspecially when your\nparents have done it\nfor you.\n- Winston Churchill",
  "Money looks better in the\nbank than on your feet.\n- Sophia Amoruso",
  "Wealth consists not in\nhaving great possessions,\nbut in having few wants.\n- Epictetus",
  "If we command our wealth,\nwe shall be rich and free.\nIf our wealth commands\nus, we are poor indeed.\n- Edmund Burke",
  "When a man has learned\nto live without money, he\nthought, a few rubles can\ngo a long way.\n- Dan Millman",
  "Spend not where you may\nsave; spare not where you\nmust spend.\n- John Ray",
  "Save a little money each\nmonth and at the end of\nthe year you'll be surprised\nat how little you have.\n- Ernest Haskins",
  "A man is usually more\ncareful of his money than\nhe is of his principles.\n- Ralph Waldo Emerson",
  "If you can count your\nmoney,you don't have\na billion dollars.\n- J. Paul Getty",
  "There is a gigantic\ndifference between\nearning a great deal of\nmoney and being rich.\n- Marlene Dietrich",
  "Saving requires us to not\nget things now so that we\ncan get bigger ones later.\n- Jean Chatzky",
  "Never spend your money\nbefore you have earned it.\n- Thomas Jefferson",
  "All days are not same.\nSave for a rainy day. When\nyou dont work, savings\nwill work for you.\n- M.K. Soni",
  "A penny saved is\na penny earned.\n- Benjamin Franklin",
  "If you cannot save\nmoney, the seeds of\ngreatness are not in you.\n- W. Clement Stone",
  "A man who both spends\nand saves money is the\nhappiest man, because\nhe has both enjoyments.\n- Samuel Johnson",
  "You must gain control\nover your money or the\nlack of it will forever\ncontrol you.\n- Lydia Sweatt",
  "Saving comes too late\nwhen you get to the\nbottom.\n- Seneca",
  "Stop buying things\nyou don't need to\nimpress people you\ndon't even like.\n- Suze Orman",
  "A man is rich in\nproportion to the things\nhe can afford to let alone.\n- Henry David Thoreau",
  "Beware of little expenses.\nA small leak will sink a\ngreat ship.\n- Benjamin Franklin",
  "People suddenly know\nhow to use money when\nthere are none left.\n- Bangambiki Habyarimana",
  "Save one-third,\nlive on one-third,\nand give away one-third.\n- Angelina Jolie",
  "Do not save what is\nleft after spending,\nbut spend what is left\nafter saving.\n- Warren Buffet",
  "If you would be wealthy,\nthink of saving as well\nas getting.\n- Benjamin Franklin",
  "A wise person should\nhave money in their head,\nbut not in their heart.\n- Jonathan Swift",
  "Money is usually attracted,\nnot pursued.\n- Jim Rohn",
  "Many folks think they\narent good at earning\nmoney, when what they\ndont know is how to use it.\n- Frank A. Clark",
  "That's 49 cents of milk\nspilt over the table!\nSomebody's gonna drink\nthat!\n- Julius Rock",
};


// ----------------------------
// Setup
// ----------------------------
void setup() {

  Serial.begin(115200); // Start serial communication

  // Initializing the display
  display.init();
  display.clear();
  display.displayOn();
  display.flipScreenVertically();
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_16);
  display.drawString(64, 0, F("IoT wallet"));
  display.setFont(ArialMT_Plain_10);
  display.drawString(64, 18, F("By igorF2"));
  display.display();

  // Connect Wi-Fi network
  Connect_to_Wifi(); 
  delay(100);

  touchAttachInterrupt(T0, callback, Threshold);  // Enable touch sensor wake up

  getTime();
  showTime();
  seconds0 = millis();
  
  btStop(); // Turn off bluetooth for saving battery 
}



// ----------------------------
// Main Loop
// ----------------------------

void loop() {

  if ((millis() - seconds0) > 60000) {
      Connect_to_Wifi();
      getTime();
      // display clock
      showTime();
      seconds0 = millis();
      WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery
      Serial.println("WiFi disabled...");
  }
  
  if (googleIt == true) {
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 20, "Connecting...");
    showTime();
    display.display();
    Connect_to_Wifi();
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 0, array[random(0, 41)]);
    display.display();
    delay(2000);
    Serial.println("Reading Google Spreadsheet data...");
    readGoogleSheet(); // Read Google Sheet data and display on OLED display
    googleIt = false;
    WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery
    Serial.println("WiFi disabled...");
  }
}
// ----------------------------


// ----------------------------
// Auxiliary functions
// ----------------------------

// Connect Wi-Fi network
void Connect_to_Wifi()
{
  WiFi.mode(WIFI_STA);
  
  // We start by connecting to a WiFi network
  WiFiMulti.addAP(ssid1, password1);
  WiFiMulti.addAP(ssid2, password2);

  Serial.println();
  Serial.print("Wait for WiFi... ");

  String displayText = "connecting";
  while (WiFiMulti.run() != WL_CONNECTED) {
    Serial.print(".");
    displayText += ".";
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 0, displayText);
    delay(100);
  }

  // Display IP if connection successful
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}


// Executed when touch sensor activated
void callback(){
  // placeholder callback function
  
  Serial.println("touche");
  googleIt = true;
  //WiFi.mode(WIFI_ON); //turn off WiFi for saving battery
}

// Read Google Spreadsheet values and update OLED display
void readGoogleSheet(){
  boolean empty = false; // identifies if the last entry of the spreadsheet was read
  int row = 2; // row of the spreadsheet to be read
  while (!empty) {
    if (wificlient.connect("sheets.googleapis.com", 443) == true) // Try to connect Google APIs server at port 443 (https)
    {
        String toSend = getString; // GET string to be sent (columns from A to E)
        toSend += "A";
        toSend += row;
        toSend += ":";
        toSend += "E";
        toSend += row;
        
        // Cells to be read from the spreadsheet
        toSend += key; // Add API key
        toSend += " HTTP/1.1"; // End of GET instruction

        wificlient.println(toSend); // Send GET to server
        wificlient.println("Host: sheets.googleapis.com");
        wificlient.println();

        // Check HTTP status
        char status[32] = {0};
        wificlient.readBytesUntil('\r', status, sizeof(status));
        if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
          Serial.print(F("Unexpected response: "));
          Serial.println(status);
          return;
        }

        // Skip HTTP headers
        char endOfHeaders[] = "\r\n\r\n";
        if (!wificlient.find(endOfHeaders)) {
          Serial.println(F("Invalid response"));
          return;
        }
        wificlient.readBytesUntil('\r', status, sizeof(status));

        // Create buffer
        DynamicJsonBuffer jsonBuffer(bufferSize);

        // Store values and convert to float
        JsonObject& root = jsonBuffer.parseObject(wificlient);
        String currency = root["values"][0][0];
        String amountStr = root["values"][0][1];
        String tickerStr = root["values"][0][2];
        String valueStr = root["values"][0][3];
        String changeStr = root["values"][0][4];
        float amount = amountStr.toFloat();
        float ticker = tickerStr.toFloat();
        float value = valueStr.toFloat();
        float change = changeStr.toFloat();

        // Update display
        if (currency != "") {
          Serial.println("Response:");
          Serial.println(currency);
          Serial.println(amount);
          Serial.println(ticker);
          Serial.println(value);
          Serial.println(change);

          display.clear();
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.setFont(ArialMT_Plain_10);
          display.drawString(64, 0, String(amount) + currency);
          display.setFont(ArialMT_Plain_16);
          display.drawString(64, 20, String(value,2) + "BRL");
          display.setFont(ArialMT_Plain_10);
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.drawString(64, 48, String(ticker,2) + "BRL"+"/"+currency+" ("+change+")");
          display.display();
          delay(300);
        }
        else {
          empty = true;
        }
        wificlient.stop();  // Stop connection to the server
      }
      else
      {
        Serial.println("Connection failured");
      }
      row++;
    }
}

//Get current time Google server
void getTime() {

  WiFiClient client;
  while (!!!client.connect("google.com", 80)) {
    Serial.println("connection failed, retrying...");
  }

  client.print("HEAD / HTTP/1.1\r\n\r\n");

  delay(500); //wait a few milisseconds for incoming message

   //if there is an incoming message
   if(client.available()){
     while(client.available()){
       if (client.read() == '\n') {    
         if (client.read() == 'D') {    
           if (client.read() == 'a') {    
             if (client.read() == 't') {    
               if (client.read() == 'e') {    
                 if (client.read() == ':') {    
                   client.read();
                   String theDate = client.readStringUntil('\r');
                   client.stop();

                   TimeDate = theDate.substring(7);
                   Serial.println(TimeDate);
                   // time starts at pos 14
                   String strCurrentHour = theDate.substring(17,19);
                   String strCurrentMinute = theDate.substring(20,22);
                   String strCurrentSecond = theDate.substring(23,25);
                   Serial.println(strCurrentHour);
                   Serial.println(strCurrentMinute);
                   Serial.println(strCurrentSecond);
                   hours = strCurrentHour.toInt();
                   hours = hours - TIMEZONE;
                   if (hours < 0) {
                    hours += 24;
                   }
                   minutes = strCurrentMinute.toInt();
                   seconds = strCurrentSecond.toInt();
                 }
               }
             }
           }
         }
       }
     }
   }
   //if no message was received (an issue with the Wi-Fi connection, for instance)
   else{
     seconds = 0;
     minutes += 1;
     if (minutes > 59) {
       minutes = 0;
       hours += 1;
       if (hours > 11) {
         hours = 0;
       }
     }
   }
   
}

void showTime(){
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_16);
  display.drawString(64, 20, String(hours) +":"+String(minutes)); 
  display.display();
}

// ----------------------------
// Add libraries
// ----------------------------
#include <WiFi.h>             // Library for Wi-Fi
#include <WiFiMulti.h>        // Library for multiple Wi-Fi connections
#include <WiFiClientSecure.h> // Library for creating a https client
#include <ArduinoHttpClient.h>// Library for crating a http client
#include <ArduinoJson.h>      // Library for reading data from json
#include <Wire.h>             // Library for I2C communication to OLED display and Accelerometer
//#include "esp_deep_sleep.h"   // Library for ESP32 deep sleep
#include "SH1106.h"           // Library for OLED display (https://github.com/squix78/esp8266-oled-ssd1306)


// ------------------------------------------------------------------------------------
// Configurations
// ------------------------------------------------------------------------------------
// The following will have to be updated according to your hardware and accounts
// ------------------------------------------------------------------------------------

// Wi-Fi network
const char* ssid1     = "XXXXXX";    // Wi-Fi router SSID
const char* password1 = "YYYYYY"; // Wi-Fi router  password
const char* ssid2     = "XXXXXX";       // Wi-Fi rounter SSID
const char* password2 = "YYYYYY";   // Wi-Fi router password

// Hardware
#define SCL_PIN D5 // ESP32 pin connected to OLED display SCL pin
#define SDA_PIN D3 // ESP32 pin connected to OLED display SDA pin
TwoWire I2Ctwo = TwoWire(1); // I2C port for the accelerometer
#define SCL1_PIN 21 // ESP32 pin connected to accelerometer SCL pin
#define SDA1_PIN 22 // ESP32 pin connected to accelerometer SDA pin

// Google API
String spreadSheetID = "ZZZZZZ";  // ID from Google spreadsheet
String key = "?key=WWWWWW";            // Google API key
const size_t bufferSize = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(5) + JSON_OBJECT_SIZE(3) + 100;  // buffer for json message
String getString = "GET /v4/spreadsheets/" + spreadSheetID + "/values/"; 

// Thingspeak API
String thingspeakKey = "UUUUUU"; // Thingspeak API key

// Other
#define Threshold 400   // Touch sensor sensitivity
#define stepThreshold 180   // Step counter sensitivity
#define TIMEZONE  3 // Current time zone. Used for correction of server time

// ----------------------------

// ----------------------------
// Global variables
// ----------------------------

// Time
String TimeDate = ""; // Variable used to store the data received from the server
int hours; // Current hour
int minutes; // Current minute
int seconds; // Current second
int seconds0;

// WiFi
WiFiMulti WiFiMulti;
WiFiClientSecure wificlient; // Create https client

// Display
SH1106 display(0x3c, SDA_PIN, SCL_PIN); // Start OLED display

// MPU 6050 accelerometer
const int MPU = 0x68;  // MPU6050 I2C address
int AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ; // Variables from the accelerometer
int steps = 0; // Number of steps
int AcX0 = 0;
int AcY0 = 0;

// Flags
boolean googleIt = false;
boolean stepDown = false;

// Quotes
String array[] = { 
  "The safe way to double\nyour money is to fold it\nover once and put it in\nyour pocket\n- Kin Hubbard", 
  "Be saving, but not at the\ncost of all liberality. Have\nthe soul of a king and the\nhand of a wise economist.\n- Joseph Joubert",
  "Look everywhere you can\nto cut a little bit from your\nexpenses. It will all add up\nto a meaningful sum.\n- Suze Orman", 
  "The quickest way to\ndouble your money is to\nfold it in half and put it in\nyour back pocket.\n- Will Rogers",
  "A budget is telling your\nmoney where to go instead\nof wondering where it went\n- John C. Maxwell",
  "You must learn to save\nfirst and spend afterwards.\n- John Poole",
  "Balancing your money is\nthe key to having enough.\n- Elizabeth Warren",
  "Saving must become a\npriority, not just a thought.\nPay yourself first.\n- Dave Ramsey",
  "By definition, saving for\nanything requires us to not\nget things now so that we\ncan get bigger ones later.\n- Jean Chatzky",
  "The art is not in making\nmoney, but in keeping it.\n- Anonymous",
  "He who will not economize\nwill have to agonize.\n- Confucius",
  "The easiest way to save\nmoney is to waste less\nenergy.\n- Barack Obama",
  "A simple fact that is hard\nto learn is that the time to\nsave money is when you\nhave some.\n- Joe Moore",
  "Saving is a very fine thing.\nEspecially when your\nparents have done it\nfor you.\n- Winston Churchill",
  "Money looks better in the\nbank than on your feet.\n- Sophia Amoruso",
  "Wealth consists not in\nhaving great possessions,\nbut in having few wants.\n- Epictetus",
  "If we command our wealth,\nwe shall be rich and free.\nIf our wealth commands\nus, we are poor indeed.\n- Edmund Burke",
  "When a man has learned\nto live without money, he\nthought, a few rubles can\ngo a long way.\n- Dan Millman",
  "Spend not where you may\nsave; spare not where you\nmust spend.\n- John Ray",
  "Save a little money each\nmonth and at the end of\nthe year you'll be surprised\nat how little you have.\n- Ernest Haskins",
  "A man is usually more\ncareful of his money than\nhe is of his principles.\n- Ralph Waldo Emerson",
  "If you can count your\nmoney,you don't have\na billion dollars.\n- J. Paul Getty",
  "There is a gigantic\ndifference between\nearning a great deal of\nmoney and being rich.\n- Marlene Dietrich",
  "Saving requires us to not\nget things now so that we\ncan get bigger ones later.\n- Jean Chatzky",
  "Never spend your money\nbefore you have earned it.\n- Thomas Jefferson",
  "All days are not same.\nSave for a rainy day. When\nyou dont work, savings\nwill work for you.\n- M.K. Soni",
  "A penny saved is\na penny earned.\n- Benjamin Franklin",
  "If you cannot save\nmoney, the seeds of\ngreatness are not in you.\n- W. Clement Stone",
  "A man who both spends\nand saves money is the\nhappiest man, because\nhe has both enjoyments.\n- Samuel Johnson",
  "You must gain control\nover your money or the\nlack of it will forever\ncontrol you.\n- Lydia Sweatt",
  "Saving comes too late\nwhen you get to the\nbottom.\n- Seneca",
  "Stop buying things\nyou don't need to\nimpress people you\ndon't even like.\n- Suze Orman",
  "A man is rich in\nproportion to the things\nhe can afford to let alone.\n- Henry David Thoreau",
  "Beware of little expenses.\nA small leak will sink a\ngreat ship.\n- Benjamin Franklin",
  "People suddenly know\nhow to use money when\nthere are none left.\n- Bangambiki Habyarimana",
  "Save one-third,\nlive on one-third,\nand give away one-third.\n- Angelina Jolie",
  "Do not save what is\nleft after spending,\nbut spend what is left\nafter saving.\n- Warren Buffet",
  "If you would be wealthy,\nthink of saving as well\nas getting.\n- Benjamin Franklin",
  "A wise person should\nhave money in their head,\nbut not in their heart.\n- Jonathan Swift",
  "Money is usually attracted,\nnot pursued.\n- Jim Rohn",
  "Many folks think they\narent good at earning\nmoney, when what they\ndont know is how to use it.\n- Frank A. Clark",
  "That's 49 cents of milk\nspilt over the table!\nSomebody's gonna drink\nthat!\n- Julius Rock",
};


// ----------------------------
// Setup
// ----------------------------
void setup() {

  Serial.begin(115200); // Start serial communication

  // Initializing the display
  display.init();
  display.clear();
  display.displayOn();
  display.flipScreenVertically();
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_16);
  display.drawString(64, 0, F("IoT wallet"));
  display.setFont(ArialMT_Plain_10);
  display.drawString(64, 18, F("By igorF2"));
  display.display();

  // Initializing accelerometer
  I2Ctwo.begin(21,22,100000);
  I2Ctwo.beginTransmission(MPU);
  I2Ctwo.write(0x6B);
  I2Ctwo.write(0); 
  I2Ctwo.endTransmission(true);
  calibrate();
  delay(500);

  // Connect Wi-Fi network
  Connect_to_Wifi(); 
  delay(100);

  touchAttachInterrupt(T0, callback, Threshold);  // Enable touch sensor wake up
  //esp_deep_sleep_enable_touchpad_wakeup();        // Enable touch sensor wake up

  getTime();
  seconds0 = millis();
  
  btStop(); // Turn off bluetooth for saving battery 
}



// ----------------------------
// Main Loop
// ----------------------------

void loop() {

  readSteps();
  delay(50); // Wait 50 ms

  if ((millis() - seconds0) > 60000) {
      Connect_to_Wifi();
      getTime();
      // display clock
      showTime();
      seconds0 = millis();
      sendToThingspeak();
      steps = 0;
      WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery
      Serial.println("WiFi disabled...");
  }

  //Serial.println("Going to sleep now...");
  //display.displayOff();
  //esp_deep_sleep_start(); // Start sleeping
  //WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery
  
  if (googleIt == true) {
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 20, "Connecting...");
    showTime();
    display.display();
    Connect_to_Wifi();
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 0, array[random(0, 41)]);
    display.display();
    delay(2000);
    Serial.println("Reading Google Spreadsheet data...");
    readGoogleSheet(); // Read Google Sheet data and display on OLED display
    googleIt = false;
    WiFi.mode(WIFI_OFF); //turn off WiFi for saving battery
    Serial.println("WiFi disabled...");
  }
}
// ----------------------------


// ----------------------------
// Auxiliary functions
// ----------------------------

// Connect Wi-Fi network
void Connect_to_Wifi()
{
  WiFi.mode(WIFI_STA);
  
  // We start by connecting to a WiFi network
  WiFiMulti.addAP(ssid1, password1);
  WiFiMulti.addAP(ssid2, password2);

  Serial.println();
  Serial.print("Wait for WiFi... ");

  String displayText = "connecting";
  while (WiFiMulti.run() != WL_CONNECTED) {
    Serial.print(".");
    displayText += ".";
    display.clear();
    display.setTextAlignment(TEXT_ALIGN_CENTER);
    display.setFont(ArialMT_Plain_10);
    display.drawString(64, 0, displayText);
    delay(100);
  }

  // Display IP if connection successful
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}


// Executed when touch sensor activated
void callback(){
  // placeholder callback function
  
  Serial.println("touche");
  googleIt = true;
  //WiFi.mode(WIFI_ON); //turn off WiFi for saving battery
}

// Read Google Spreadsheet values and update OLED display
void readGoogleSheet(){
  boolean empty = false; // identifies if the last entry of the spreadsheet was read
  int row = 2; // row of the spreadsheet to be read
  while (!empty) {
    if (wificlient.connect("sheets.googleapis.com", 443) == true) // Try to connect Google APIs server at port 443 (https)
    {
        String toSend = getString; // GET string to be sent (columns from A to E)
        toSend += "A";
        toSend += row;
        toSend += ":";
        toSend += "E";
        toSend += row;
        
        // Cells to be read from the spreadsheet
        toSend += key; // Add API key
        toSend += " HTTP/1.1"; // End of GET instruction

        wificlient.println(toSend); // Send GET to server
        wificlient.println("Host: sheets.googleapis.com");
        wificlient.println();

        // Check HTTP status
        char status[32] = {0};
        wificlient.readBytesUntil('\r', status, sizeof(status));
        if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
          Serial.print(F("Unexpected response: "));
          Serial.println(status);
          return;
        }

        // Skip HTTP headers
        char endOfHeaders[] = "\r\n\r\n";
        if (!wificlient.find(endOfHeaders)) {
          Serial.println(F("Invalid response"));
          return;
        }
        wificlient.readBytesUntil('\r', status, sizeof(status));

        // Create buffer
        DynamicJsonBuffer jsonBuffer(bufferSize);

        // Store values and convert to float
        JsonObject& root = jsonBuffer.parseObject(wificlient);
        String currency = root["values"][0][0];
        String amountStr = root["values"][0][1];
        String tickerStr = root["values"][0][2];
        String valueStr = root["values"][0][3];
        String changeStr = root["values"][0][4];
        float amount = amountStr.toFloat();
        float ticker = tickerStr.toFloat();
        float value = valueStr.toFloat();
        float change = changeStr.toFloat();

        // Update display
        if (currency != "") {
          Serial.println("Response:");
          Serial.println(currency);
          Serial.println(amount);
          Serial.println(ticker);
          Serial.println(value);
          Serial.println(change);

          display.clear();
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.setFont(ArialMT_Plain_10);
          display.drawString(64, 0, String(amount) + currency);
          display.setFont(ArialMT_Plain_16);
          display.drawString(64, 20, String(value,2) + "BRL");
          display.setFont(ArialMT_Plain_10);
          display.setTextAlignment(TEXT_ALIGN_CENTER);
          display.drawString(64, 48, String(ticker,2) + "BRL"+"/"+currency+" ("+change+")");
          display.display();
          delay(300);
        }
        else {
          empty = true;
        }
        wificlient.stop();  // Stop connection to the server
      }
      else
      {
        Serial.println("Connection failured");
      }
      row++;
    }
}

// Read sensor and add to steps count
void readSteps() {
  I2Ctwo.beginTransmission(MPU);
  I2Ctwo.write(0x3B);  // starting with register 0x3B (ACCEL_XOUT_H)
  I2Ctwo.endTransmission(false);
  I2Ctwo.requestFrom(MPU,14,true);  // Request reading

  // Store readings
  AcX=I2Ctwo.read()<<8|I2Ctwo.read();
  AcY=I2Ctwo.read()<<8|I2Ctwo.read();
  
  float amplitude;
  amplitude = sqrt((AcX-AcX0)^2 + (AcY-AcY0)^2);

  if (amplitude < stepThreshold) {
    stepDown = true;
  }

  if ((amplitude >= stepThreshold) && stepDown) {
    stepDown = false;
    steps++; 
  }

  display.clear();
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_10);
  display.drawString(64, 20, "Step count:");
  display.setFont(ArialMT_Plain_16);
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.drawString(64, 48, String(steps));
  showTime();
  display.display();
}


void calibrate() {
  I2Ctwo.beginTransmission(MPU);
  I2Ctwo.write(0x3B);  // starting with register 0x3B (ACCEL_XOUT_H)
  I2Ctwo.endTransmission(false);
  I2Ctwo.requestFrom(MPU,14,true);  // Request reading

  // Store readings
  AcX0=I2Ctwo.read()<<8|I2Ctwo.read();
  AcY0=I2Ctwo.read()<<8|I2Ctwo.read();
}


//Get current time Google server
void getTime() {

  WiFiClient client;
  while (!!!client.connect("google.com", 80)) {
    Serial.println("connection failed, retrying...");
  }

  client.print("HEAD / HTTP/1.1\r\n\r\n");

  delay(500); //wait a few milisseconds for incoming message

   //if there is an incoming message
   if(client.available()){
     while(client.available()){
       if (client.read() == '\n') {    
         if (client.read() == 'D') {    
           if (client.read() == 'a') {    
             if (client.read() == 't') {    
               if (client.read() == 'e') {    
                 if (client.read() == ':') {    
                   client.read();
                   String theDate = client.readStringUntil('\r');
                   client.stop();

                   TimeDate = theDate.substring(7);
                   Serial.println(TimeDate);
                   // time starts at pos 14
                   String strCurrentHour = theDate.substring(17,19);
                   String strCurrentMinute = theDate.substring(20,22);
                   String strCurrentSecond = theDate.substring(23,25);
                   Serial.println(strCurrentHour);
                   Serial.println(strCurrentMinute);
                   Serial.println(strCurrentSecond);
                   hours = strCurrentHour.toInt();
                   hours = hours - TIMEZONE;
                   if (hours < 0) {
                    hours += 24;
                   }
                   minutes = strCurrentMinute.toInt();
                   seconds = strCurrentSecond.toInt();
                 }
               }
             }
           }
         }
       }
     }
   }
   //if no message was received (an issue with the Wi-Fi connection, for instance)
   else{
     seconds = 0;
     minutes += 1;
     if (minutes > 59) {
       minutes = 0;
       hours += 1;
       if (hours > 11) {
         hours = 0;
       }
     }
   }
   
}

void showTime(){
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.setFont(ArialMT_Plain_10);
  display.drawString(64, 0, String(hours) +":"+String(minutes)); 
}


// Read Google Spreadsheet values and update OLED display
void sendToThingspeak(){  
  String stringToSend = "GET https://api.thingspeak.com/update?api_key=" + thingspeakKey + "&field1=" + String(steps);
  Serial.println(stringToSend);
  WiFiClient wificlient;
  wificlient.connect("api.thingspeak.com", 80);
  delay(300);
  wificlient.println(stringToSend); // Send GET to server   
  delay(500);
}