Owon B41t web interface

Javascript interface for digital multimeter OWON B41T+

Test it here in your browser: Github webpage

Requirements

• It requires a modern browser with Javascript Bluetooth enabled (tested with Chrome and Edge)
• Bluetooth BLE 4.0+ hardware interface
• Check bluetooth first with Chrome browser: chrome://bluetooth-internals

I tested with TP-Link UB400 adapted module on Desktop Windows 10.

Owon meters protocol

B41T+ follows B35 protocol, which is described here : https://github.com/DeanCording/owonb35

Basically every BT notification contains 3 int16:

• one identifying the active measure, the number of decimals, and the units
• one identifying the measure type (hold/auto/max/min...) * this one is not parsed at the moment *
• one containing the displays digits with most significant bit used as sign bit

Bluetooth with Javascript

Reference document : Web Bluetooth