Build a BLE Environmental Sensor with M5Stack + Web Bluetoot

In this video, we build a wireless environmental sensing device using the M5Stack Atom S3 and an ESP32. It broadcasts live temperature, humidity, and pressure data over Bluetooth Low Energy (BLE) using the GATT Environmental Sensing Service. We then connect to it using Web Bluetooth in Chrome — no app required!

You’ll learn:

• How to configure BLE GATT services and characteristics

• How to read sensor data from the SHT40 and BMP280

• How to build a simple real-time web dashboard using Web Bluetooth

Perfect for IoT, smart home, or DIY sensor networks. Compatible with most modern browsers and Android tablets.