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.
Download:
file
import audioio, 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 = audioio.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.
Adafruit Feather M4 Express - Featuring ATSAMD51
PRODUCT ID: 3857
It's what you've been waiting for, the Feather M4 Express featuring ATSAMD51. This Feather is fast like a swift, smart like an owl, strong like a ox-bird (it's half ox,...
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Basic Multi-Color Micro SMT Test Hooks (6-pack)
PRODUCT ID: 4322
Testing and debugging is a challenging step in board manufacturing. It can be super tricky on a fully populated PCB. So how can you test connections when you have an assortment of...
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