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Wren

Wren is a compact altimeter capable of fitting in a standard 18mm model rocket. It is designed to be assembled by JLCPCB for as low of a price as possible. The altitude, velocity and acceleration are sampled and saved at 50Hz. The battery should last for tens of hours while waiting for a launch and is charged through USB-C

Hardware

A 12mm x 34mm 4 layer PCB, designed to only use components from JLCPCB's stock. Single sided assembly with only a debug connector and battery pads (and branding of course ;) ) on the back.

  1. MCU: An nRF52833, small package, USB PHY and incredibly low power.

  2. Accelerometer: A LIS2DH rotated 45° allowing it to measure accelerations up to 22.5G instead of the typical 16G limit.

  3. Barometer: A BMP388 for altitude measurements, better options available but limited by availability for PCB assembly

  4. Flash Memory: 4Mbit of onboard flash. Should log ~4 flights at 50Hz

  5. Battery: LiPo charging at 30mA

Software

The onboard firmware is being developed using Rust with the Embassy framework. The dashboard is written in Python