Feather M4 Express used as signal generator and colour source for demonstrating sensor plotter on CLUE.
A Feather M4 Express board was enlisted to aid the demonstration of the sensor plotter in the video on the previous page. It provided:
- alternating red, green blue light from the onboard NeoPixel for the CLUE's APDS-9960 colour sensor;
- two analogue signals from A0 and A1 which were connected to the #0 and #1 pads on the CLUE using some test hooks.
Its SAMD51 (M4) processor is useful here as it has 2 DACs.
The code running on the board was very short and simply typed in over the serial console on CircuitPython's REPL.
import audioio, audiocore, board, neopixel, time
dacpair = audioio.AudioOut(board.A0,
right_channel=board.A1)
filename = "adafruit-spinning-logo-plot-2chan.wav"
wav_file = open(filename, "rb")
samples = audiocore.WaveFile(wav_file)
samples.sample_rate = 500
dacpair.play(samples, loop=True)
pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
# Loop forever showing r, g, b while the
# DACs continue to loop the samples from wav file
while True:
pixel[0] = (255, 0, 0) # red
time.sleep(0.5)
pixel[0] = (0, 255, 0) # green
time.sleep(0.5)
pixel[0] = (0, 0, 255) # blue
time.sleep(0.5)
Wav files are typically used for audio but they can be used for any signal. In this case the adafruit-spinning-logo-plot-2chan.wav has two signals following the top and bottom outline of the Adafruit logo, spinning 1/5th of a revolution in total across five frames.
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