Revision of fancontrol.py

mga revised this gist 1 year ago. Go to revision

2 files changed, 90 insertions

fancontrol.py(file created)

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1	+	#! /usr/bin/python
2	+	# PWM fan speed controller
3	+
4	+	import RPi.GPIO as GPIO
5	+	import time
6	+	import signal
7	+	import sys
8	+	import os
9	+
10	+	# Configuration
11	+	FAN_PIN = 14 # BCM pin used to drive PWM fan
12	+	WAIT_TIME = 10 # [s] Time to wait between each refresh
13	+	PWM_FREQ = 25 # [kHz] 25kHz for Noctua PWM control
14	+
15	+	# Configurable temperature and fan speed
16	+	MIN_TEMP = 35
17	+	MAX_TEMP = 65
18	+	FAN_LOW = 40
19	+	FAN_HIGH = 100
20	+	FAN_OFF = 0
21	+	FAN_MAX = 100
22	+
23	+	# Get CPU's temperature
24	+	def getCpuTemperature():
25	+	res = os.popen('vcgencmd measure_temp').readline()
26	+	temp =(res.replace("temp=","").replace("'C\n",""))
27	+	#print("temp is {0}".format(temp)) # Uncomment for testing
28	+	print("temp:", temp)
29	+	return temp
30	+
31	+	# Set fan speed
32	+	def setFanSpeed(speed):
33	+	print("speed:", speed)
34	+	fan.start(speed)
35	+	return()
36	+
37	+	# Handle fan speed
38	+	def handleFanSpeed():
39	+	temp = float(getCpuTemperature())
40	+	# Turn off the fan if temperature is below MIN_TEMP
41	+	if temp < MIN_TEMP:
42	+	setFanSpeed(FAN_OFF)
43	+	#print("Fan OFF") # Uncomment for testing
44	+	# Set fan speed to MAXIMUM if the temperature is above MAX_TEMP
45	+	elif temp > MAX_TEMP:
46	+	setFanSpeed(FAN_MAX)
47	+	#print("Fan MAX") # Uncomment for testing
48	+	# Caculate dynamic fan speed
49	+	else:
50	+	step = (FAN_HIGH - FAN_LOW)/(MAX_TEMP - MIN_TEMP)
51	+	temp -= MIN_TEMP
52	+	setFanSpeed(FAN_LOW + ( round(temp) * step ))
53	+	#print(FAN_LOW + ( round(temp) * step )) # Uncomment for testing
54	+	return ()
55	+
56	+	try:
57	+	# Setup GPIO pin
58	+	GPIO.setwarnings(False)
59	+	GPIO.setmode(GPIO.BCM)
60	+	GPIO.setup(FAN_PIN, GPIO.OUT, initial=GPIO.LOW)
61	+	fan = GPIO.PWM(FAN_PIN,PWM_FREQ)
62	+	setFanSpeed(FAN_OFF)
63	+	# Handle fan speed every WAIT_TIME sec
64	+	while True:
65	+	handleFanSpeed()
66	+	time.sleep(WAIT_TIME)
67	+
68	+	except KeyboardInterrupt: # trap a CTRL+C keyboard interrupt
69	+	setFanSpeed(FAN_HIGH)
70	+	#GPIO.cleanup() # resets all GPIO ports used by this function

fancontrol.sh(file created)

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1	+	#! /bin/sh
2	+	# fancontrol starter script
3	+
4	+	# Carry out specific functions when asked to by the system
5	+	case "$1" in
6	+	start)
7	+	echo "Starting fancontrol.py"
8	+	/usr/local/bin/fancontrol.py &
9	+	;;
10	+	stop)
11	+	echo "Stopping fancontrol.py"
12	+	pkill -f /usr/local/bin/fancontrol.py
13	+	;;
14	+	*)
15	+	echo "Usage: /etc/init.d/fancontrol.sh {start\|stop}"
16	+	exit 1
17	+	;;
18	+	esac
19	+
20	+	exit 0

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