Electrifier HC-05 Bluetooth Module UART Serial 2.4GHz for DIY Projects | Master and slave modes via AT commands, onboard push button, 3.3V logic level, default 9600 baud, 6-pin breakout header

Adding wireless serial communication to a microcontroller project usually means either a tangle of cables or an expensive radio link. The Electrifier HC-05 Bluetooth module solves this in one board: it converts standard UART serial data to Bluetooth, letting any development board or TTL serial device exchange data with a smartphone, PC, or a second HC-05 module without a physical connection. At its core is the CSR BC417 Bluecore chipset running Bluetooth v2.0 with EDR on the 2.4GHz ISM band, with adaptive frequency hopping and an integrated PCB trace antenna handling the radio side. The module sits on a ZS-040 breakout board that accepts 3.6V to 6V input through onboard regulation, while all signal pins operate at 3.3V logic — pair it directly with 3.3V systems, or add a simple resistor divider on the RXD line for 5V development boards. Six clearly labelled pins (EN, VCC, GND, TXD, RXD, State) and a solder-ready male header make wiring straightforward. The onboard push button enters AT command mode, where you can rename the device, change the pairing code, adjust the baud rate from its 9600 default, or switch between slave and master roles — meaning the same board can either accept connections from a phone or actively pair with another HC-05. That flexibility makes it a fit for wireless robot and RC car control, home automation triggers, sensor data logging, GPS telemetry, and college or hobby embedded projects across India's maker community. It suits students building their first Bluetooth link just as well as engineers prototyping a serial-cable replacement. Every Electrifier module is produced in ISO-certified manufacturing facilities and covered by a one-year warranty, backed by the Electrifier brand assurance.