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94
fanctrl.py
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94
fanctrl.py
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import RPi.GPIO as GPIO
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import signal
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import sys
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from gpiozero import CPUTemperature
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import time
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from pathlib import Path
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import configparser
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# initializing GPIO, setting mode to BOARD.
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# Default pin of fan is physical pin 8, GPIO14
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Fan = 8
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GPIO.setwarnings(False)
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GPIO.setmode(GPIO.BOARD)
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GPIO.setup(Fan, GPIO.OUT)
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def handle_exit(signum, frame):
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print(f"Signal {signum} received, setting fan to 100%")
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p.ChangeDutyCycle(100)
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time.sleep(0.5) # waiting to ensure that PWM is set
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p.stop()
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GPIO.cleanup()
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sys.exit(0)
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#initialize GPIO
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p = GPIO.PWM(Fan, 50)
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p.start(0)
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signal.signal(signal.SIGTERM, handle_exit)
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signal.signal(signal.SIGINT, handle_exit) # optional (Ctrl+C)
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def read_config():
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confparser = configparser.ConfigParser()
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f = Path("/boot/config.txt")
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if f.is_file():
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confparser.read('/boot/config.txt')
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else:
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f = Path('/boot/firmware/config.txt')
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if f.is_file():
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confparser.read('/boot/firmware/config.txt')
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return confparser
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confparser = read_config()
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def parse_config():
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confparser = read_config()
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stages= []
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stage0_temp = float(confparser['fan']['fan_temp0_temp'])
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stage0_speed = float(confparser['fan']['fan_temp0_speed'])
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stage1_temp = float(confparser['fan']['fan_temp1_temp'])
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stage1_speed = float(confparser['fan']['fan_temp1_speed'])
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stage2_temp = float(confparser['fan']['fan_temp2_temp'])
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stage2_speed = float(confparser['fan']['fan_temp2_speed'])
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stages.append({'temp': stage0_temp,'speed': stage0_speed})
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stages.append({'temp': stage1_temp,'speed': stage1_speed})
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stages.append({'temp': stage2_temp,'speed': stage2_speed})
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return stages
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stages = parse_config()
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print(f'stages={stages}')
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try:
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stage= oldstage = 0
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print(f'stage={stage}')
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while True:
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cpu = CPUTemperature()
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temperature = cpu.temperature
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#print(f'temperature={temperature}/{temp}')
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if temperature < stages[0]['temp']:
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stage = 0
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elif temperature > stages[1]['temp'] and temperature < stages[2]['temp']:
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stage = 1
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elif temperature > stages[2]['temp']:
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stage = 2
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if stage != oldstage:
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oldstage = stage
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print(f'stage={stage},temperature={temperature}°C')
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p.ChangeDutyCycle(stages[stage]['speed'])
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time.sleep(0.2)
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except KeyboardInterrupt:
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pass
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finally:
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# ensure on exit that fan runs full speed
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p.ChangeDutyCycle(100)
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p.stop()
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GPIO.cleanup()
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