Bl12-a3 Bluetooth -

void setup() Serial.begin(9600); bt.begin(9600); // Match BL12-A3 default baud Serial.println("BL12-A3 ready");

1. Introduction The BL12-A3 is a compact, low-power, and highly integrated Bluetooth 4.0 (BLE) module designed for short-range wireless communication. It is widely adopted in Internet of Things (IoT) projects, smart home devices, wireless sensor networks, and educational microcontroller prototyping. The module acts as a transparent serial data bridge, converting UART (Universal Asynchronous Receiver-Transmitter) signals to Bluetooth signals and vice versa. This makes it exceptionally easy to use with platforms like Arduino, ESP32, STM32, and Raspberry Pi. bl12-a3 bluetooth

Common AT commands (entered after sending +++ with guard times before and after): void setup() Serial

Always verify your vendor’s datasheet, as pin assignments and command sets may vary slightly between manufacturers. When in doubt, start with the factory default 9600 baud and use a USB-to-TTL adapter to test the module independently before integrating it into a larger system. End of write-up. The module acts as a transparent serial data