Automated Shower Boiler

#include <math.h>
#include <CurieBLE.h>
#include <Wire.h>
#include "rgb_lcd.h"

rgb_lcd lcd;

const int colorR = 255;
const int colorG = 0;
const int colorB = 0;
const int B = 4275;
const int R0 = 100000;
const int pinTempSensor = A3;
const int relayPin = 13; 
const int ledPin = 12;
int Greenled = 8;

BLEPeripheral blePeripheral; // create peripheral instance

BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // create service

// create switch characteristic and allow remote device to read and write
BLECharCharacteristic switchChar("19B10001-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(relayPin, OUTPUT); // use the relay on pin 13 as an output
  pinMode(ledPin, OUTPUT);
  pinMode(Greenled, OUTPUT);
  // set the local name peripheral advertises
  blePeripheral.setLocalName("LEDCB");
  // set the UUID for the service this peripheral advertises
  blePeripheral.setAdvertisedServiceUuid(ledService.uuid());

  // add service and characteristic
  blePeripheral.addAttribute(ledService);
  blePeripheral.addAttribute(switchChar);

  // assign event handlers for connected, disconnected to peripheral
  blePeripheral.setEventHandler(BLEConnected, blePeripheralConnectHandler);
  blePeripheral.setEventHandler(BLEDisconnected, blePeripheralDisconnectHandler);

  // assign event handlers for characteristic
  switchChar.setEventHandler(BLEWritten, switchCharacteristicWritten);
// set an initial value for the characteristic
  switchChar.setValue(0);

  // advertise the service
  blePeripheral.begin();
  Serial.println(("Bluetooth device active, waiting for connections..."));

// set up the LCD's number of columns and rows:
    lcd.begin(16, 1);
    
    lcd.setRGB(colorR, colorG, colorB);
    
    delay(1000);
}

void loop() {

    // poll peripheral
  blePeripheral.poll();

  // put your main code here, to run repeatedly:
      int a = analogRead(pinTempSensor);
      float R = 1023.0/((float)a)-1.0;
      R = 100000.0*R;

      float temperature=1.0/(log(R/100000.0)/B+1/298.15)-273.15;

       if (temperature < 20) {
    // turn LED on:
    digitalWrite(relayPin, HIGH);
    digitalWrite(Greenled, LOW);
  } else {
    // turn LED off:
    digitalWrite(relayPin, LOW);
    digitalWrite(Greenled, HIGH);
  }
      Serial.print("temperature= ");
      Serial.println(temperature);
      delay(1000);

    // Print a message to the LCD.
      lcd.print(" Temperature: ");
      lcd.print(temperature);
}

void blePeripheralConnectHandler(BLECentral& central) {
  // central connected event handler
  Serial.print("Connected event, central: ");
  Serial.println(central.address());
}

void blePeripheralDisconnectHandler(BLECentral& central) {
  // central disconnected event handler
  Serial.print("Disconnected event, central: ");
  Serial.println(central.address());
}

void switchCharacteristicWritten(BLECentral& central, BLECharacteristic& characteristic) {
  // central wrote new value to characteristic, update LED
  Serial.print("Characteristic event, written: ");

  if (switchChar.value()) {
    Serial.println("LED on");
    digitalWrite(ledPin, HIGH);
    digitalWrite(relayPin, HIGH);
  } else {
    Serial.println("LED off");
    digitalWrite(ledPin, LOW);
    digitalWrite(relayPin, LOW);
  }
    // scroll 13 positions (string length) to the left
    // to move it offscreen left:
    for (int positionCounter = 0; positionCounter < 13; positionCounter++) {
        // scroll one position left:
        lcd.scrollDisplayLeft();
        // wait a bit:
        delay(100);
    }

    // scroll 29 positions (string length + display length) to the right
    // to move it offscreen right:
    for (int positionCounter = 0; positionCounter < 29; positionCounter++) {
        // scroll one position right:
        lcd.scrollDisplayRight();
        // wait a bit:
        delay(100);
    }

    // scroll 16 positions (display length + string length) to the left
    // to move it back to center:
    for (int positionCounter = 0; positionCounter < 16; positionCounter++) {
        // scroll one position left:
        lcd.scrollDisplayLeft();
        // wait a bit:
        delay(100);
    }

    // delay at the end of the full loop:
    delay(150);
}