HC-05 AT Commands Tutorial | Complete Arduino Bluetooth Master Slave Setup
HC-05 AT Commands Tutorial | Complete Arduino Bluetooth Master Slave Setup
In this video, we do a complete and in-depth tutorial on the HC-05 Bluetooth module AT Command Mode. You’ll learn how to configure the HC-05 using AT commands, change its name, baud rate, password, role (Master/Slave), bind devices, and set up automatic Bluetooth communication between two Arduino UNOs.
This tutorial covers:
✅ What is HC-05 AT Command Mode
✅ Difference between Data Mode and AT Mode
✅ Default HC-05 settings
✅ How to enter AT Command Mode correctly
✅ AT command responses (OK, ERROR(0), ERROR(1), No response)
✅ Change Bluetooth name using AT+NAME
✅ Change role using AT+ROLE (Master / Slave)
✅ Configure baud rate using AT+UART
✅ Restore factory settings using AT+ORGL
✅ Bind two HC-05 modules using AT+BIND
✅ Configure connection mode using AT+CMODE
✅ Complete Arduino to Arduino Bluetooth communication project
✅ Wireless LED brightness control using potentiometer
We also demonstrate a practical example where two Arduino boards communicate wirelessly using two HC-05 modules — one configured as Master and the other as Slave.
If you're learning Arduino and want to fully understand how the HC-05 works internally, this video is for you.
📌 Recommended: Watch our previous HC-05 introduction video for complete understanding.
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