![]() You will not see the command you enter repeated back to you in the Serial Monitor, you will only see the OK responses. You should see an OK response in the Serial Monitor for each command. ![]() You can enter AT commands in lower or upper case. Just send AT again and it should then respond OK. It is all right if the response you see to the first AT command is ERROR. Enter AT on the send line and click Send. Set the Line Ending to Both NL & CR and baud rate to 38400. The LED on the transceiver will blink slowly to indicate it is in programming mode and it is listening for commands at baud rate to 38400. After power up you can release the button. Hold the Key button on the Bluetooth transceiver down while you connect the Arduino to the computer to power it up. You could also use an FTDI adapter to program the transceiver. We are just using the USB-to-serial adapter on the UNO to communicate with the Bluetooth transceiver. The UNO can be running a sketch that does nothing with the Serial port, such as the Blink sketch, or you can connect the Reset pin to GND to make the UNO main processor do nothing. The schematic and picture show the wiring and show using an UNO for this. You can see more in String Table.Set the Bluetooth transceiver to 57600 baud, and give it a name and password so you can pair it with your computer and communicate with the Pro Mini. "Z" is represent the ON state of Switch 1 and "z" is represent the OFF state of Switch 1. ![]() After pairing back to App and turn on "Switch 1".Īfter paring the indicator LED in the HC-05 will stop continuous blinking and blink the same LED with some delay. Click that and pair the HC-05 with your phone. Which shows the character corresponding to each button. After installation Open the app then you can see the string table. Now we need install an App in Smartphone. After turn on the Arduino Uno, The indicator LED in the HC-05 will start blinking continuously Otherwise you may encounter with some problem to upload the code.Ĭonnection is completed. 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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