Inital commit

1 files changed, 45 insertions, 0 deletions

diff --git a/thermo.py b/thermo.py
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+++ b/thermo.py
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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)