Complete code after Post 1

post1complete.nut

// Adapted from:
// http://techgurka.blogspot.com/2013/04/quick-temperature-graph-using-electric.html
 
class TemperatureSensor {
    i2cPort = null;
    constructor(port) {
        i2cPort = port;
        i2cPort.configure(CLOCK_SPEED_100_KHZ);
    }
    // Retrieve temperature (from local sensor) in deg F
    function getTemperature(unit) {
        i2cPort.write(0x90, "");
        i2cPort.write(0x90, "0");
 
        // Wait for conversion to finish
        imp.sleep(0.05);
        local data = i2cPort.read(0x90, "\x00", 2);
        if (data == null) {
            server.log("Error reading TMP102");
            return null;
        }
 
        // Remove two's complement if negative temperature
        local degrees = data[0];
        if (degrees & 0x80)
            degrees = -((degrees - 1) ^ 0xFF);
            
        // Calculate no of steps. Each step is 0.0625 degrees centigrades
        local steps = degrees * 16 + (data[1] >> 4);
        
        local temperature = steps * 0.0625;
        if (unit == 'F')
            temperature = temperature * 9 / 5 + 32;
        
        return temperature;
    }
}
 
setPoint <- 68;
sensor <- TemperatureSensor(hardware.i2c12);
 
function updateTemp() {
 
  // Read the ambient temperature
  temp <- readTemp();
 
  // If it's below what it should be, turn on the heat.
  if (temp < setPoint) {
  	heatOn();
  } else {
  	// If it's not below, that means it's above. Turn the heat on!
  	heatOff();
  }
}
        
function mainLoop() {
   updateTemp();
   // in 60 seconds, call mainLoop again
   imp.wakeup(60, mainLoop);
}
 
function readTemp() {
	server.log("reading temperature: ");
	temp <- sensor.getTemperature('F');
	server.log(temp);
	return temp;
}
 
 
// heatControlWire lets us control pin1 of the electric imp.
heatControlWire <- hardware.pin5;
 
// Configure it so that 1 = 3.3v and 0 = 0v.
heatControlWire.configure(DIGITAL_OUT);
 
function heatOn() {
	// debug message so you know what the imp is doing
	server.log("heat is on");
	heatControlWire.write(1);
}
 
function heatOff() {
	server.log("heat is off");
	heatControlWire.write(0);
}
 
mainLoop();