Then upload the code to Arduino Uno Please make sure the Rx and Tx pin of HC-05 remove from Arduino Uno while uploading. ![]() You can see the complete code in the code section of this article. Operating Voltage: 4V to 6V (Typically +5V).Here we operate this module in Data Mode. If that pin set as "HIGH" the module is in AT command mode. When the enable pin is "LOW" the HC-05 is in Data Mode. One is Data mode and other is AT command mode. ![]() So we can interface this module with any microcontroller which supports USART. The module communicate with the help of USART (Universal Synchronous/Asynchronous Receiver/Transmitter ) at the baud rate of 9600. ![]() Because it operates Serial Port Protocol (SSP). We can use it with most micro controllers. HC-05 is a Bluetooth module which can communicate in two way.
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