Bl12-a3 — Bluetooth

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

You can find the BL12-A3 Bluetooth on Amazon, eBay, AliExpress, and at electronics discount retailers. Prices typically range from . bl12-a3 bluetooth

The BL12-A3 Bluetooth module is versatile and can be used in a wide range of applications, including: Common AT commands (entered after sending +++ with

#include <SoftwareSerial.h>

| Pin | Name | Direction | Function | |-----|------|-----------|----------| | 1 | VCC | Input | 3.3V DC power input | | 2 | GND | Power | Ground reference | | 3 | TXD | Output | Transmits serial data from module to host (e.g., to Arduino RX) | | 4 | RXD | Input | Receives serial data from host to module (e.g., from Arduino TX) | | 5 | RTS | Input | Request to Send (hardware flow control) – often left unconnected | | 6 | CTS | Output | Clear to Send – often left unconnected | including: #include &lt