64 lines
2.3 KiB
Python
64 lines
2.3 KiB
Python
# SPDX-FileCopyrightText: 2020 Eva Herrada for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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import time
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import math
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from adafruit_circuitplayground import cp
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brightness = 0
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# List that holds the last 10 z-axis acceleration values read from the accelerometer.
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# Used for the n=10 moving average
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last10 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
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# List that holds the last 50 z-axis acceleration values read from the accelerometer.
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# Used for the n=50 moving average
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last50 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
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consecutive_triggers = 0
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cp.pixels.fill((255, 0, 0))
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light_on = False
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while True:
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x, y, z = cp.acceleration
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# moving average n=10, not super smooth, but it substantially lowers the amount of noise
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last10.append(z)
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last10.pop(0)
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avg10 = sum(last10)/10
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# moving average n=50, very smooth
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last50.append(z)
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last50.pop(0)
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avg50 = sum(last50)/50
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# If the difference between the moving average of the last 10 points and the moving average of
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# the last 50 points is greater than 1 m/s^2, this is true
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if avg10 - avg50 > 1:
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if consecutive_triggers > 3: # Is true when avg10-avg50 > 1m/s^2 at least 3 times in a row
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# Detects shake. Due to the very low shake threshold, this alone would have very low
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# specificity. This was mitigated by having it only run when the acceleration
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# difference is greater than 1 m/s^2 at least 3 times in a row.
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if not cp.shake(shake_threshold=10):
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# Set brightness to max, timestamp when it was set to max, and set light_on to true
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cp.pixels.brightness = 1
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start = time.monotonic()
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light_on = True
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consecutive_triggers += 1 # increase it whether or not the light is turned on
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# light_on variable is for short circuiting. Not really necessary, just makes things run faster
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elif not light_on or time.monotonic() - start > 0.4:
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# Sine wave used for the color breathing effect.
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# Max brightness can be adjusted with the coefficient.
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cp.pixels.brightness = abs(math.sin(brightness)) * 0.5
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brightness += 0.05
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consecutive_triggers = 0
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light_on = False
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time.sleep(0.02)
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