Yeah Hand Web App

Web app and backend bridge for controlling the Yeah Hand robotic/prosthetic hand.

System Architecture

This project has two main layers:

Firmware layer

• Written in C/C++
• Runs on the ESP32 inside the robotic hand
• Controls the motors/fingers
• Receives command strings such as PINCH 50

Web/backend layer

• Written in JavaScript/TypeScript
• Runs on a PC/server, not on the hand
• Provides the browser interface
• Sends commands from the web app to the hand over Bluetooth/serial

The file backend/services/BluetoothService.js belongs to the backend layer. It is not firmware code.

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Backend Bluetooth Service (WIP)

The current Bluetooth service simulates the connection and command flow so the backend structure can be tested without the physical hand.

Requirements

• Node.js v20 recommended
• npm

Setup

npm install

Run the simulated Bluetooth test

node backend/test/bluetoothTest.js

Expected Output

Connecting to Bluetooth device...
Simulated Bluetooth connection established.
Sending command to hand: PINCH 50
Disconnecting from Bluetooth device...
Bluetooth connection closed.