65774dbeaa
Add support for a network display, and for a coolin fan. Note that at the moment we support one and only one coolin fan, along with the CPU fan.
46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
import RPi.GPIO as GPIO
|
|
import time
|
|
|
|
WAIT_TIME = 1
|
|
|
|
class GetCaseFanSpeed:
|
|
TACH = 18
|
|
PULSE = 2
|
|
def __init__( self, tachPin = TACH):
|
|
self._tachPin = tachPin
|
|
self._rpm = 0
|
|
self._t = time.time()
|
|
self.GPIO = GPIO
|
|
self.GPIO.setmode( self.GPIO.BCM )
|
|
self.GPIO.setwarnings( False )
|
|
self.GPIO.setup( self._tachPin, self.GPIO.IN, pull_up_down=self.GPIO.PUD_UP )
|
|
self.GPIO.add_event_detect( self._tachPin, self.GPIO.FALLING, self._calcRPM )
|
|
|
|
def __del__( self ):
|
|
self.GPIO.cleanup()
|
|
|
|
def _calcRPM( self, n ):
|
|
dt = time.time() - self._t
|
|
if dt < 0.005: return # Reject spuriously short pulses
|
|
|
|
freq = 1 / dt
|
|
self._rpm = (freq / GetCaseFanSpeed.PULSE) * 60
|
|
self._t = time.time()
|
|
|
|
@property
|
|
def RPM( self ):
|
|
return self._rpm
|
|
|
|
if __name__ == "__main__":
|
|
|
|
fanSpeed = GetCaseFanSpeed()
|
|
|
|
try:
|
|
for i in range( 10 ):
|
|
print( f"{fanSpeed.RPM:.0f} RPM" )
|
|
time.sleep( 2 )
|
|
|
|
except KeyboardInterrupt:
|
|
GPIO.cleanup()
|
|
|
|
|