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# import modules
import RPi.GPIO as GPIO
import time
# initialise variables
device_file = '/sys/bus/w1/devices/28-00000400aaf8/w1_slave'
# initialise LEDs array [GPIO_ID]
leds = [18,17,27,22,23,24,25] # 32 16 8 4 2 1 0.5
# initialise GPIO for LEDs
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
for led in leds:
GPIO.setup(led, GPIO.OUT)
# read thermometer
def read_temp_raw():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines
def temp_updates():
lines = read_temp_raw()
# check that it hasn't failed to read in some way
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
# get temperature string from lines read from device
temp_string = float(str(lines[1].split("t=",1)[1]))
# round temp to nearest 0.5
temp = round(temp_string / 1000.0*2.0)/2.0
# set 0.5 LED value
if str(temp)[-1] == "5":
GPIO.output(leds[6], 1)
else:
GPIO.output(leds[6], 0)
# turn temp into binary, string, remove "0b", pad with 0s
temp = str(bin(int(temp))).replace("0b","").zfill(6)
# set LED states
for i in range(6):
GPIO.output(leds[i], int(temp[i]))
while True:
temp_updates()
time.sleep(1)
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