HC12 baud rate

HC12 change baud rate code
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Download the .zip file below. Extract it and open the code in Arduino IDE. Make the connections as in the schematic, select the COM and uplaod the code to the Arduino. Open the monitior at 9600 baud rate and send the AT comands. "

Downlaod HC12 baud rate change code (last update 29/09/2018)

arduino hc12 baud rate change tutorial

Or copy the code from below!

/*Code to change the HC-12 baud rate
 * Arduino  |   HC-12
  D11           TxD
  D10           RxD
  GND           GND
  GND           SET
  5V            VCC
SoftwareSerial hc12(11, 10);

void setup() 
digitalWrite(7,LOW); // enter AT command mode
hc12.print(F("AT+C001")); // set to channel 1 
digitalWrite(7,LOW);// enter transparent mode
void loop() 
if(Serial.available()) hc12.write(;
if(hc12.available()) Serial.write(;

 * 1. Change Baud Rate:
Enter “AT+Bxxxx” to change baud rate to xxxx bps.
Example: Enter “AT+B19200” and the module will work at baud rate 19200 bps and return “OK+B19200”.
The available values of xxxx are: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200.
The default baud rate is 9600 bps.
 * 2. Change Communication Channel:
Enter “AT+Cyyy” to change communication channel to yyy.
Example: Enter “AT+C021” and the module will change to channel 021 and return “OK+C021”.
The available values of yyy are: 001, 002, 003, …, 127.
The default channel is 001.
 * 3. Factory Reset:
Enter “AT+DEFAULT” and the module will reset to default settings and return “OK+DEFAULT”.


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