Smart Bike | Northwestern Micro:bit v2 Base

By Jackson Bremen, Evan Waite, Sengdao Inthavong

We created an embedded system to track a rider’s performance on a bike using a Micro:bit and modern sensors.

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

Requirements

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

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

On Ubuntu:

cd /tmp \
&& wget -c https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2020q2/gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2 \
&& tar xjf gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2 \
&& sudo mv gcc-arm-none-eabi-9-2020-q2-update /opt/gcc-arm-none-eabi-9-2020-q2-update \
&& rm gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2 \
&& sudo ln -s /opt/gcc-arm-none-eabi-9-2020-q2-update/bin/* /usr/local/bin/.

On MacOS:

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

JTAG programming tools: Segger JLink

Pick the correct package for your OS under "Software and documentation pack".
Update the JTAG firmware on your Micro:bit v2

Follow the instructions here: https://www.segger.com/products/debug-probes/j-link/models/other-j-links/bbc-microbit-j-link-upgrade/

(You can later restore the original firmware with the instructions here: https://microbit.org/get-started/user-guide/firmware/)

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.