# Can enable debug output by uncommenting:
#import logging
#logging.basicConfig(level=logging.DEBUG)

import time

import Adafruit_GPIO.SPI as SPI
import MAX6675.MAX6675 as MAX6675

from simple_pid import PID
kP =150
kI = 5
kD = 1

setpoint = 580
pid = PID(kP, kI, kD, setpoint)
loop_size = int(3000)
pid.output_limits = (0, loop_size)    # output value will be between 0 and  5000


# Raspberry Pi software SPI configuration.
CLK = 3
CS  = 14
DO  = 4
sensor = MAX6675.MAX6675(CLK, CS, DO)

relayPin = 2

import RPi.GPIO as GPIO    # Import Raspberry Pi GPIO library
GPIO.setwarnings(False)    # Ignore warning for now
GPIO.setmode(GPIO.BCM)   # Use physical pin numbering
GPIO.setup(relayPin, GPIO.OUT, initial=GPIO.LOW)   # Set pin 8 to be an output pin and set initial value to low (off)

# Define a function to convert celsius to fahrenheit.
def c_to_f(c):
        return c * 9.0 / 5.0 + 32.0
        
print('Press Ctrl-C to quit.')
try:
    while True:
        temp = c_to_f(sensor.readTempC())
        start_milli_time = int(round(time.time() * 1000))
        current_milli_time = int(round(time.time() * 1000))	
        current_loop_end = start_milli_time + loop_size

        while current_milli_time < current_loop_end:
		        temp = c_to_f(sensor.readTempC())
		        output = pid(temp)
		        if current_milli_time < start_milli_time + output:
			        GPIO.output(relayPin, GPIO.HIGH)
		        else:
			        GPIO.output(relayPin, GPIO.LOW)
		        current_milli_time = int(round(time.time() * 1000))
		        time.sleep(0.3)
		        print("Temp: {0:.2f}, PWR: {1:.2f}, {2}".format(temp, output, GPIO.input(relayPin)))
except:
    GPIO.output(relayPin, GPIO.LOW)
    print("Exiting properly")