Northwestern Micro:bit v2 starter code + implemented driver code for an ultrasonic theremin

Built a theremin which uses ultrasonic sensors to determine pitch rather than electromagnetic fields.

Wrote driver code for interfacing with a speaker, ultrasonic sensor, joystick, capacitive touch sensor, and 3 x 3 LED display. Some of which are programmed with event-driven architectures.

This repository has applications and board initialization that connects to the build system provided by nrf52x-base.

Requirements

1. Various tools

   • build-essential (make)
   • git
   • python3
   • pyserial (sudo apt install python3-serial)

2. ARM cross-compiler toolchain: gcc-arm-none-eabi toolchain

   On Ubuntu:

   sudo apt install gcc-arm-none-eabi
   

   On MacOS:

   brew tap ArmMbed/homebrew-formulae
   brew update
   brew install ARMmbed/homebrew-formulate/arm-none-eabi-gcc
   

3. JTAG programming tools: OpenOCD

   On Ubuntu:

   sudo apt install openocd
   

   On MacOS:

   brew install open-ocd
   

Installation

• Clone the repository
• Change directory into the repository
• git submodule update --init --recursive (this will take a couple minutes to complete)

Building and loading applications

To build an application, use make inside of the application's directory.

make flash uploads the application to the board using JTAG.

Getting print data

The Micro:bit v2 prints information through a serial port at 38400 baud. You can connect with any serial terminal, but miniterm comes with pyserial and works pretty well for this.

$ pyserial-miniterm /dev/ttyACM0 38400