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Diffstat (limited to 'rpi-temp-control.py')
| -rw-r--r-- | rpi-temp-control.py | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/rpi-temp-control.py b/rpi-temp-control.py new file mode 100644 index 0000000..d99824a --- /dev/null +++ b/rpi-temp-control.py @@ -0,0 +1,60 @@ +#!/usr/bin/env python3 + +## +# rpi-temp-control +# +# +# +# Matt Kohls + +import subprocess +from gpiozero import Motor +from pid import PID +from time import sleep + +# Defaults +TEMP_TARGET = float(47.0) +FAN_PIN = 17 # Pin the fan control is tied to +DUMMY_PIN = 18 # Any unused pin. Used to setup Motor from gpiozero +MIN_FAN_SPEED = 80 / 100 + +## Grabs Temperature of GPU/CPU +# +# @return temperature of GPU/CPU +def grab_temp(): + try: + file = open("/sys/class/thermal/thermal_zone0/temp", "r") + val = int(file.readline()) / 1000 + file.close() + return val + except: + print("Error reading from thermal zone") + return 0 + +# Initial loop setup +ploop = PID(1, 1, .02, Integrator_max=100, Integrator_min=0, Set_Point=TEMP_TARGET) +cycle = 1 +fan = Motor(FAN_PIN, DUMMY_PIN) +fan.forward(cycle) +last_duty_cycle = 0 +last_temp = 0 + +while True: + sleep(1) + temp = grab_temp() + print(temp) + cycle_change = (ploop.update(temp)) * -1 + cycle = (100 + int(cycle_change)) / 100 # Since fan.forward() wants a number between 0 and 1 + + if cycle <= .2: + cycle = 0 + elif cycle > 1: + cycle = 1 + elif cycle < MIN_FAN_SPEED: + cycle = MIN_FAN_SPEED + + if cycle == 0: + fan.stop() + elif last_duty_cycle != cycle: + fan.forward(cycle) + last_duty_cycle = cycle
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