place fan_control.service in /etc/systemd/system and then:
$ sudo systemctl enable fan_control
$ sudo systemctl start fan_control
Created
April 29, 2019 20:10
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raspberry pi fan control
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| import wiringpi | |
| import time | |
| from subprocess import PIPE, Popen | |
| def init_fan(): | |
| wiringpi.pwmSetMode(0) # PWM_MODE_MS = 0 | |
| wiringpi.wiringPiSetupGpio() | |
| wiringpi.pinMode(18, 2) # pwm only works on GPIO port 18 | |
| wiringpi.pwmSetClock(6) # this parameters correspond to 25kHz | |
| wiringpi.pwmSetRange(128) | |
| def fan_set(percent): | |
| wiringpi.pwmWrite(18, int((percent/100.0)*128)) | |
| def get_cpu_temperature(): | |
| """get cpu temperature using vcgencmd""" | |
| process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE) | |
| output, _error = process.communicate() | |
| return float(output[output.index(b'=') + 1:output.rindex(b"'")]) | |
| desired_temperature = 52.0 | |
| fan_speed = 100 | |
| sum = 0 | |
| p_temp = 15 | |
| i_temp = 0.4 | |
| def get_fan_speed(actual_temperature): | |
| global fan_speed,sum | |
| diff = actual_temperature - desired_temperature | |
| sum = sum + diff | |
| pDiff = diff * p_temp | |
| iDiff = sum * i_temp | |
| fan_speed = pDiff + iDiff | |
| if fan_speed > 100: | |
| fan_speed = 100 | |
| if fan_speed < 10: | |
| fan_speed = 0 | |
| if sum > 100: | |
| sum = 100 | |
| if sum < -100: | |
| sum = -100 | |
| return fan_speed | |
| init_fan() | |
| control = 0 | |
| while True: | |
| temp = get_cpu_temperature() | |
| control = get_fan_speed(temp) | |
| fan_set(control) | |
| # print(control, temp) | |
| time.sleep(1) |
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| [Unit] | |
| Description=PWM fan control | |
| After=network.target | |
| [Service] | |
| ExecStart=/usr/bin/python3 fan_control.py | |
| WorkingDirectory=/home/pi/bin | |
| StandardOutput=inherit | |
| StandardError=inherit | |
| Restart=always | |
| User=root | |
| [Install] | |
| WantedBy=multi-user.target |
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