AT Commands are sent to the module serially using a USB-to-TTL cable or an Arduino.įor AT command the interfacing with Arduino RX pin of Arduino must be connected with the Rx pin of HC-05 and Tx pin of Arduino is connected to Tx pin of HC-05. If you want to change name and password of your HC-05 you must configure it with AT commands. Your HC-05 Bluetooth module may have default name and password. Now we will configure the HC-05 with the help of AT command. To simplify our tutorial, we will not use the voltage divider rule but it is recommended to 3.3V otherwise your Rx pin may be damaged. To do that you can use the voltage divider rule. Communication range: up to 10 meters (depending on the environment).Operating Current: less than 40mA (at 3.3V).
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