gSENSOR

An open-source high-g accelerometer project based on ESP32-C3 and ADXL375.

Overview

gSENSOR is designed for measuring high-g accelerations (up to ±200g) with real-time display and wireless data streaming. Perfect for impact testing, vibration analysis, and other applications requiring high-g measurement.

Features

• High-g Measurement: ADXL375 accelerometer with ±200g range
• Real-time Display: Round LCD showing live X, Y, Z values and magnitude
• BLE Streaming: Wireless data transmission at 20Hz to companion app
• USB Serial Output: 100Hz CSV data stream for logging
• Peak Tracking: Monitor and reset peak acceleration values
• Android App: Companion app for visualization, recording, and data export

Hardware

• MCU: ESP32-2424S012 (ESP32-C3 with 1.28" round LCD)
• Accelerometer: ADXL375 (±200g, I2C interface)
• Display: GC9A01 round LCD (240x240)

Wiring

ADXL375	ESP32-2424S012
VCC	3.3V
GND	GND
SDA	GPIO4
SCL	GPIO5

Project Structure

gSENSOR/
├── Firmware/           # ESP32 PlatformIO project
│   ├── src/           # Source code
│   ├── include/       # Header files
│   └── platformio.ini # Build configuration
├── gSENSOR-Android/   # Android companion app
│   ├── app/           # App source code
│   └── Dockerfile     # Docker build environment
└── 3D_Printed_Parts/  # Enclosure STL files

Building

Firmware

cd Firmware
pio run
pio run -t upload

Android App

Using Docker:

cd gSENSOR-Android
docker build -t gsensor-android-build .
docker run --rm --user root -e GRADLE_USER_HOME=/tmp/gradle \
  -v "$(pwd):/app" -w /app gsensor-android-build \
  sh -c "./gradlew assembleDebug --no-daemon --project-cache-dir=/tmp/project-cache"

APK output: gSENSOR-Android/app/build/outputs/apk/debug/app-debug.apk

BLE Protocol

Service UUID: 12345678-1234-5678-1234-56789abcde00

Characteristic	UUID	Description
Accel Data	...de01	20-byte packet: timestamp(4) + x(4) + y(4) + z(4) + magnitude(4)
Peak Value	...de02	Peak magnitude tracking
Control	...de03	Commands: 0x01=reset peak, 0x02=reset filters

License

MIT License

Author

Giorgio Gilestro

• Email: giorgio@gilest.ro
• GitHub: https://github.com/gilestrolab/gSensor