Add wireless Bluetooth serial communication to your Arduino or microcontroller project with this HC-05 module. It replaces wired serial connections, letting you communicate wirelessly with phones, computers, GPS modules, and other Bluetooth devices. Configurable as either master or slave via AT commands, with a default baud rate of 9600 and pairing code 1234. The onboard LED indicates connection status. Key Features Bluetooth 2.0 – Classic Bluetooth with CSR chip Master or Slave Mode – Configurable via AT commands Serial Replacement – Wireless UART communication 10m Range – Class 2 Bluetooth Wide Baud Range – 4800 to 1,382,400 bps Low Power – 8mA when connected Onboard Regulator – 3.3V LDO included Status LED – Visual connection indicator Specifications Bluetooth – v2.0 + EDR Frequency – 2.4GHz ISM band Operating Voltage – 3.3V (2.7V–4.2V) Current – 35mA pairing, 8mA connected TX Power – +6 dBm Sensitivity – -85 dBm Default Baud – 9600 Default PIN – 1234 Dimensions – 37mm × 15mm Pinout STATE – Connection status RXD – Serial receive TXD – Serial transmit GND – Ground VCC – Power (3.3V–4.2V) EN – Enable pin Ideal For Arduino wireless serial projects Bluetooth remote control Wireless data logging Phone-to-microcontroller communication Package Contents 1× HC-05 Bluetooth module
