power/power.ino

/*
 * Power: Activate a relay to simulate pressing the power button of a PC
 * A Raspberry Pi or clone must be attached to I2C.
 * TODO: add IR support
 */

#include <IRremote.h>
#include <Wire.h>

const int RECV_PIN = 11;
const int ledPin = 13;
int incomingByte = 0;

IRrecv irrecv(RECV_PIN);

decode_results results;

void setup()
{
  Serial.begin(9600);
  // In case the interrupt driver crashes on setup, give a clue
  // to the user what's going on.
  Serial.println("Enabling IRin");
  irrecv.enableIRIn(); // Start the receiver
  Serial.println("Enabled IRin");
  pinMode(12, OUTPUT);
  digitalWrite(12, LOW);

  pinMode(7, INPUT);
  
  // i2c code
  Wire.begin(0x8);                // join i2c bus with address #8
  Wire.onReceive(receiveEvent); // register event
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW); // turn it off
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.println(results.value);
    if(results.value == 16580863) {
      pressTheButton();
    }
    irrecv.resume(); // Receive the next value
  }
  delay(100);
  if(digitalRead(7)) { // In case the user presses the original power button
    pressTheButton();
    delay(1000);
  }
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
    if(incomingByte == 120) {
      pressTheButton();
    }
  }
  //pressTheButton();
}



void receiveEvent(int howMany) {
  Serial.println("event");
  while (Wire.available()) { // loop through all but the last
    int c = Wire.read(); // receive byte as a character
    if(c == 120) {
      pressTheButton();
    }
    
  }
  
}
       
void pressTheButton() {
  if(millis() > 5000) { // Avoid any bootup false inputs
    digitalWrite(12, HIGH); // toggle relay for power button for 0.5 sec
    digitalWrite(ledPin, HIGH);
    sei();      //Enables interrupts
    delay(500);   //Wait 1 second
    //cli(); 
    //delay(500);
    digitalWrite(12, LOW);
    digitalWrite(ledPin, LOW);
    Serial.println("button pressed!");
  }
}