Pinewood Derby Speedometer

Implements a simple speedometer for the 2024 Cub Scouts Pinewood Derby just because.

Parts

• Adafruit HUZZAH32 - ESP32 Feather (overview, product)
• Adafruit 7-Segment LED FeatherWings (overview, product)
• Adafruit LSM6DSOX + LIS3MDL FeatherWing - Precision 9-DoF IMU (overview, product)
• A3144E Hall Effect Sensor

Setup

Prerequisites

• arduino-cli
• python3 (>=3.10)
• make
• (optional) direnv

Instructions

For environments with nix, simply run nix-shell to setup the development environment. In the absense of nix, the manual instructions below may be followed instead.

Manual

• arduino-cli core update-index --additional-urls https://espressif.github.io/arduino-esp32/package_esp32_index.json
• arduino-cli core update-index - Update the core index
• arduino-cli core install esp32:esp32 - Install the core for the ESP32
• python3 -m pip install -r requirements.txt - Install the ESP32 prerequisites

References

• arduino-esp32 - Arduino core for the ESP32
• ESP32 Arduino Core’s documentation
• ESP32 Datasheet
• Arduino CLI
• FreeRTOS.org
• FreeRTOS esp32
• A3141, A3142, A3143, and A3144