Heat pump control with buttons

Other Hardware Home Automation
3

#include <Arduino.h>
#include <HeatpumpIR.h> // GitHub - ToniA/arduino-heatpumpir: An Arduino library to control split-unit heatpumps over Infrared
#include <Button.h> // Arduino Playground - Button Library

/*

This is a project I did for my my friend's summer cottage (he was previously using the MideaRelayControl sketch).
He has an alarm system with some extra relays which can be controlled via GSM SMS messages. With two relays
we can have four heatpump states:

  • relay 1 OFF and relay 2 in any state: heatpump OFF
  • relay 1 ON and relay 2 OFF: heatpump ON, normal heating state
  • relay 1 ON and relay 2 ON: heatpump ON, maintenance heating (FP mode on Midea's remote)

The IR led is driven by a transistor amplifier. I used 2 ohms as the resistor. I might sound
very small, but also the led operates on very short bursts. For example Panasonic uses 2 ohm
resistor for the IR led on its remotes.
*/

#define IR_HEADER_MARK 3500
#define IR_HEADER_SPACE 1800
#define IR_BIT_MARK 420
#define IR_ONE_SPACE 1350
#define IR_ZERO_SPACE 470
#define IR_PAUSE_SPACE 10000

// Heatpump states
const byte heatpumpOff = 0;
const byte heatpumpNormal = 1;
const byte heatpumpMaintenance = 2;

Button relay1 = Button(11, INPUT_PULLUP); // Heatpump ON-OFF state
Button relay2 = Button(12, INPUT_PULLUP); // FP mode (maintenance heating at 8 degrees C) ON-OFF state

IRSenderPWM irSender(9); // IR led on Duemilanove digital pin 9, using Arduino PWM

byte heatpumpState = heatpumpOff;

void sendRaw(char *symbols)
{
irSender.space(0);
irSender.setFrequency(38);

while (char symbol = *symbols++)
{
switch (symbol)
{
case '1':
irSender.space(IR_ONE_SPACE);
irSender.mark(IR_BIT_MARK);
break;
case '0':
irSender.space(IR_ZERO_SPACE);
irSender.mark(IR_BIT_MARK);
break;
case 'W':
irSender.space(IR_PAUSE_SPACE);
break;
case 'H':
irSender.mark(IR_HEADER_MARK);
break;
case 'h':
irSender.space(IR_HEADER_SPACE);
irSender.mark(IR_BIT_MARK);
break;
}
}

irSender.space(0);
}

void setup(){
Serial.begin(9600);
delay(500);
Serial.println(F("Starting..."));
}

void loop(){

if (relay1.isPressed()) {
// Normal heating operation
if (!relay2.isPressed() && heatpumpState != heatpumpNormal) {
Serial.println(F("Normal heating operation"));

  Serial.println(F("* Sending power OFF"));
  sendRaw("Hh0100000000000100000001110010000000000000000000000000000001100000WHh01000000000001000000011100100000000000000001001000101000000000011000111000000000000000000111000000000111000000000000000010010001000000000000000001010011");
  delay(15 * 1000); // 15 seconds, to allow full shutdown

  Serial.println(F("* Sending normal heat command"));
  sendRaw("Hh0100000000000100000001110010000000000000000000000000000001100000WHh01000000000001000000011100100000000000001001001001010100000000011000010100000000000000000111000000000111000000000000000010010001000000000000000010001000");
  heatpumpState = heatpumpNormal;

// Maintenance heating operation
} else if (relay2.isPressed() && heatpumpState != heatpumpMaintenance) {
  Serial.println(F("Maintenance heating operation"));

  Serial.println(F("* Sending power OFF"));
  sendRaw("Hh0100000000000100000001110010000000000000000000000000000001100000WHh01000000000001000000011100100000000000000001001000101000000000011000111000000000000000000111000000000111000000000000000010010001000000000000000001010011");
  delay(15 * 1000); // 15 seconds, to allow full shutdown

  Serial.println(F("* Switching to maintenance heating"));
  sendRaw("Hh0100000000000100000001110010000000000000000000000000000001100000WHh01000000000001000000011100100000000000001001001000101000000000011000111000000000000000000111000000000111000000000000000010010001000000000000000011010011");

  heatpumpState = heatpumpMaintenance;
}

// Power OFF
} else if (!relay1.isPressed() && heatpumpState != heatpumpOff) {
heatpumpState = heatpumpOff;
Serial.println(F("Sending power OFF"));
sendRaw("Hh0100000000000100000001110010000000000000000000000000000001100000WHh01000000000001000000011100100000000000000001001000101000000000011000111000000000000000000111000000000111000000000000000010010001000000000000000001010011");
}

delay(500); // 0.5 seconds delay
}