OpenDragy - Open-Source High-Precision 10Hz GPS Performance Timer

Pushing the boundaries of performance.

This is the official 3D printable enclosure for OpenDragy, an open-source vehicle performance timer. Pair this hardware with our completely free Flutter companion app to track a variety of tests with incredible precision.

OpenDragy utilizes high-rate 10Hz binary u-blox GPS telemetry, a 100Hz IMU accelerometer, and zero-crossing interpolation to give you millisecond-level accuracy that rivals commercial performance timers.

✨ Features of OpenDragy

• High-Precision 10Hz GPS: Reads binary u-blox navigation packets 10 times per second directly from the GPS chipset for pinpoint speed and position tracking.

• Real-Time G-Force Logging: Streams live 100Hz accelerometer data directly to the companion app for instant G-force mapping and acceleration curves.

• Zero-Crossing Interpolation: Interpolates exact launch times down to the millisecond.

• Auto-Armed Launch: Automatically starts recording when you hit 3.0 km/h, bypassing GPS drift.

• Fleet Management & Analytics: Manage vehicle profiles and view interactive slope, elevation, and G-force charts in the app.

🛠 Hardware Required (BOM)

To build this, you will need the following off-the-shelf electronics:

• ESP32-S3 Mini Development Board

• QUESCAN G10A-F30 UBX M10 GPS Module

• BMI160 Accelerometer/Gyroscope IMU Module

• Magnets: 4x 10x3mm Neodymium disc magnets (for enclosure and mounting base)

• Fasteners: 4x M3x8mm screws and 2x M3x4mm screws

• Adhesive: Double-sided mounting tape (VHB) for securing the magnetic base to your dashboard

🔗 Links & Firmware

• Source Code & Firmware: GitHub Repository

• Project Website: OpenDragy Official Site

Print Instructions / Settings

• Material: ASA (Highly recommended to withstand high temperatures on a hot car dashboard!)

• Layer Height: 0.2mm

• Infill: 20%

• Wall Loops (Perimeters): 3