Maquina_Cafe_v_18.05.26_beta.ino

int ThermistorPin = A0;
int Vo;
float R1 = 5000;       // 5000 47Kohms
float logR2, R2, T, Tc;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
const int ButtonCoffee  = 12;     // pushbutton
const int RelayCoffee   = 10;     // green led
const int RelayBoiler   = 11;     // red led
const int LedError      = 9;      // yellow led
int buttonState      = 0;     // current state of the button
int lastButtonState  = 0;     // previous state of the button
int ledState         = 0;     // remember current led state

void setup() {
  pinMode(ButtonCoffee, INPUT);   // button coffee
  pinMode(RelayCoffee, OUTPUT);   // green led
  pinMode(RelayBoiler, OUTPUT);   // red led
  pinMode(LedError, OUTPUT);      // yellow led
  pinMode(LedPower, OUTPUT);      // white led
  digitalWrite (RelayBoiler, LOW);
  digitalWrite (RelayCoffee, LOW);
  digitalWrite (LedError, LOW);
}

void loop() {
  Boiler();
  Coffee();
}

void Boiler() {
  Vo = analogRead(ThermistorPin);
  R2 = R1 * (1023.0 / (float)Vo - 1.0);
  logR2 = log(R2);
  T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
  Tc = T - 273.15;
  if ( Tc > 0 && Tc < 78 ) // cold
{
  digitalWrite (RelayBoiler, HIGH);
  digitalWrite (LedError, LOW);
}
  else if ( Tc > 80 ) // hot
{
  digitalWrite (RelayBoiler, LOW);
  digitalWrite (LedError, LOW);
}
  else if ( Tc < 0 ) // error
{
  digitalWrite (RelayBoiler, LOW);
  digitalWrite (LedError, HIGH);
}
  delay(200); // delay between ntc readings
}

void Coffee() {
  buttonState = digitalRead(ButtonCoffee);
  if (buttonState != lastButtonState)
{
  if (buttonState == 1)
{
  if(ledState == 1) ledState=0;
  else            ledState=1;
}
  lastButtonState = buttonState;
}
  digitalWrite(RelayCoffee, ledState);
  delay(20);  //debouncing
}