![]() ![]() Every serial data given to this pin will be broadcasted/ transmitted via Bluetooth. Everything received via Bluetooth will be given out by this pin as serial data. Ground pin of the module, connect to system ground. LOW – Connection Mode, HIGH – AT command mode. This pin is used to toggle between Connection Mode and AT command mode. You can get a quick overview of the Bluetooth standard here. ![]() ![]() This is the reason why we’re still using Bluetooth in our day to day lives. The Bluetooth protocol operates at 2.4GHz in the same unlicensed ISM frequency band where RF protocols like ZigBee and WiFi also exist. Who wouldn’t want to control all the appliances in their home with just a touch of a button on your smartphone? Wireless technology has expanded tremendously over the past few decades, and Bluetooth wireless technology is one of a kind, the process of transmission and reception of data between two devices has become super easy with the help of Bluetooth technology. Learn how to set up an app on your smartphone to access the microcontroller via Bluetooth.Build the circuit step by step to implement the above using the HC-05 Bluetooth module and AT89C51 microcontrollers.Learn to write a C program to control a peripheral device connected via a relay to 8051 based on the data received from the smartphone via Bluetooth.Interface the HC-05 Bluetooth module with an 8051 and use it to control a couple of LEDs via a relay.Here’s what you’ll be able to accomplish by the end of this post: ![]()
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