The Bluetooth module wants 3.3v logic levels so that is taken into account. The image above shows a buffer chip doing the conversion, but the Fritzing schematic on the post uses a voltage divider.

Verify the Bluetooth Module Can Receive Data Ensure that your HC-06 module can receive data using Arduino's built-in Serial class. You can find detailed information here: Serial Input Basics - Arduino ...

Creating a Bluetooth-controlled device with an Arduino Uno and an HC-05 Bluetooth module enables control of lights or even relays to manage AC appliances wirelessly using an Android smartphone.

This project uses some sensors and Arduino to design and implement the Affordable Smart ECG Monitoring System. ECG monitoring is now becoming part of everyday life. Through ECG characteristics such as ...

The board is based on the uBlox Bluetooth module including a 64 MHz Arm Cortex M4F core from Nordic Semiconductor running Mbed OS, an OS for Arm-based embedded systems which allows simultaneous ...