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doc for sensors

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petrucci4prez 2017-06-18 15:31:02 -04:00
parent dc8ff22ed8
commit 61201da8c6
1 changed files with 12 additions and 0 deletions
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sensors.py
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@ -1,3 +1,6 @@
'''
IR and magnetic sensors
'''
import RPi.GPIO as GPIO import RPi.GPIO as GPIO
import logging, time import logging, time
from functools import partial from functools import partial
@ -14,6 +17,15 @@ logger.setLevel(logging.INFO)
INIT_DELAY = 60 INIT_DELAY = 60
def _lowPassFilter(pin, targetVal, period=0.001): def _lowPassFilter(pin, targetVal, period=0.001):
'''
Crude implementation of an LPF for a binary signal. This exists to filter
out voltage spikes that are induced by mains current fuctuations.
Basically uses a timed loop to determine if a pin is changing within a
given period. If a change occurs within period, this is considered 'high
frequency' and the function returns False. If not, the pin is evaluated with
a target value, which returns a boolean result that can be used elsewhere
'''
divisions = 10 divisions = 10
sleepTime = period/divisions sleepTime = period/divisions