HC-05 ZS-040 Bluetooth Module — Master/Slave, UART

HC-05 ZS-040 Bluetooth Module — Master/Slave, UART

The HC-05 ZS-040 is the most popular Bluetooth serial module for Arduino and microcontroller projects. Unlike the HC-06 (slave only), the HC-05 can be configured as both Bluetooth master and slave via AT commands — enabling device-to-device Bluetooth connections without a smartphone. Communicates via UART serial at 3.3V logic (5V tolerant on most boards), making it compatible with virtually any microcontroller.

Key Specifications

• Bluetooth: v2.0 + EDR | Range: up to 10m (Class 2)
• Mode: Master / Slave (configurable via AT commands)
• Interface: UART | Default baud rate: 9600bps
• Operating voltage: 3.3V | I/O: 3.3V / 5V compatible
• Pairing: Default PIN: 1234 | Configurable via AT commands
• Compliance: RoHS compliant

Why Choose This?

• ✅ Master + Slave modes — connect two HC-05 modules together without a smartphone
• ✅ AT command configurable — change baud rate, name, PIN and mode via serial terminal
• ✅ UART serial interface — transparent wireless serial, works with any microcontroller
• ✅ 5V tolerant — connect directly to Arduino Uno TX/RX without level shifter

Typical Applications

• Wireless serial communication between Arduino boards
• Smartphone-to-Arduino Bluetooth control apps
• RC robot and drone wireless control
• Wireless sensor data transmission

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