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GPIO fan control script #444

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merged 3 commits into from Jun 21, 2016
Merged

GPIO fan control script #444

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50027d4
Merge pull request #1 from cyoung/master
egid Jun 21, 2016
43c0da7
adding @helno's GPIO fan control script.
Jun 21, 2016
837c6ec
adding fancontrol to the root user's dir; no automation at this time.
Jun 21, 2016
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34 changes: 34 additions & 0 deletions image/fancontrol.py
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@@ -0,0 +1,34 @@
#!/usr/bin/python
# @Author Ryan Dewsbury (helno)
#
# This script throttles a fan based on CPU temperature.
#
# It expects a fan that's externally powered, and uses GPIO pin 11 for control.

import RPi.GPIO as GPIO
import time
import os

# Return CPU temperature as float
def getCPUtemp():
cTemp = os.popen('vcgencmd measure_temp').readline()
return float(cTemp.replace("temp=","").replace("'C\n",""))

GPIO.setmode(GPIO.BOARD)
GPIO.setup(11,GPIO.OUT)
GPIO.setwarnings(False)
p=GPIO.PWM(11,1000)
PWM = 50

while True:

CPU_temp = getCPUtemp()
if CPU_temp > 40.5:
PWM = min(max(PWM + 1, 0), 100)
p.start(PWM)
elif CPU_temp < 39.5:
PWM = min(max(PWM - 1, 0), 100)
p.start(PWM)
time.sleep(5)

GPIO.cleanup()
3 changes: 3 additions & 0 deletions image/mkimg.sh
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Expand Up @@ -53,6 +53,9 @@ cp -f interfaces mnt/etc/network/interfaces
#custom hostapd start script
cp stratux-wifi.sh mnt/usr/sbin/
chmod 755 mnt/usr/sbin/stratux-wifi.sh
#fan/temp control script
cp fancontrol.py mnt/root/
chmod 755 mnt/root/fancontrol.py

#isc-dhcp-server config
cp -f isc-dhcp-server mnt/etc/default/isc-dhcp-server
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