#!/usr/bin/python

import RPi.GPIO as GPIO
from time import sleep

# pins for the LEDs
pin_g = 22
pin_y = 27
pin_r = 17
pin_fan = 14

# temperature thresholds in Celsius
low = 55
mid = 65
high = 75

GPIO.setmode(GPIO.BCM)
GPIO.setup(pin_g, GPIO.OUT, initial=GPIO.LOW)
GPIO.setup(pin_y, GPIO.OUT, initial=GPIO.LOW)
GPIO.setup(pin_r, GPIO.OUT, initial=GPIO.LOW)
GPIO.setup(pin_fan, GPIO.OUT, initial=GPIO.LOW)

try:
    tfile = open('/sys/class/thermal/thermal_zone0/temp')
    while True:
        tfile.seek(0)
        temp = float(tfile.read()) / 1000
        print temp

        GPIO.output(pin_g, temp > low)
        GPIO.output(pin_y, temp > mid)
        GPIO.output(pin_r, temp > high)
        GPIO.output(pin_fan, temp > mid)

        sleep(1);
except:
    print "exiting"
finally:
    tfile.close()
    GPIO.cleanup()