Designing a General Purpose Heat Pump Controller

[buffalobillpatrick]

Whew! took hours, lots of stuff don't work in a ISR (Interrupt Service Routine)
delay(x) , lcd.print, &
biggest pain was
Compiler was optimizing out various "delay for loops" that I tried, even with index declaired volatile.
I wanted about 30 sec. delay between Compressor off & water pumps off.
analogRead didn't optimize out!

This WORKS!

//done in setup:   attachInterrupt(1, Stop_Compressor_ISR, RISING);// Attach Interrupt 

    // (IRQ1 is on Digital Pin 3) Pin 3 going high (+) sets Interrupt 1
    // This is Master signal to STOP HP Compressor, by denergizing R3
    // with a short power cycle to Solar pump, which picks a relay
    // N/O point connects Arduino +5v to Digital Pin 3
    // Digital Pin 3 has a 10K pulldown resistor to Gnd.
    // This allows the water pumps to continue after Compressor is off	     
    // After a delay the master will power off this Slave Arduino
    //	This would be a normal ending sequence for HP satisfying Load 
   	     
void Stop_Compressor_ISR()	     
{			
//#define Max_Long_int_number   2147483647 
#define Big_number               250000

  long Z;
  int Y;
  
  detachInterrupt(1);   
  
  digitalWrite (HP_RLY_R3,                  HIGH); //Compressor OFF
  
  for (Z = 0; Z < Big_number; Z++) {analogRead(1);}  //delay about 30 sec.  
  
  digitalWrite (HP_RLY_R2,                  HIGH); //Pumps OFF  
  digitalWrite (ALIVE_RLY_R1,               HIGH); //Alive OFF

  do{Y = Y;} while (Y == Y);  //hang forever
}