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embedded

Experiments with embedded devices. This repository contains Arduino sketches and accompanying Python scripts.

led-on-input.ino

Usage:

  • Connect to serial port at 115200 baud
  • Send A to flash blue LED
  • Send B to flash green LED
  • Send C to flash red LED

ble.ino | bleak.py

Usage:

  • Scan for devices to find the device you want to connect to
  • Update BLE_DEVICE_ADDRESS variable
  • Currently hardcoded to read BLE Characteristics of certain handler numbers at src/bleak.py#L25
  • Uses an asyncio.Queue for collecting notifications. This is in preparation to feed data into an ML workflow for training

acc-serial.ino | acc_serial.py

Usage:

  • Much simpler sketch for transmitting acc data over serial
  • Has more bandwidth for higher sampling rate as well

audio-serial.ino | mic_serial.py

  • Transmit 16-bit integer PCM from the Nicla Voice through serial port
  • This was particarly tricky to figure out because:
    • Arduino docs suggests that PDM library can be used, which is not the case
    • Audio samples are only accessible through NDP.extractData. Moreover, NDP will only be initialised if all 3 synpkg are successfully loaded
    • This means that your Nicla Voice will always boot with a bunch of shit printed into the Serial port, which you need to kill
  • Requires pyserial module

References