HC-12 connecting to HC-05

Projects Networking, Protocols, and Devices
1

Hello, I have been working in a project where I transmit data with HC-12 to a base station with HC-12 receiver. I was able to get the data, but I also want to display this data to an android phone. I am thinking of using an HC-05 bluetooth module. Do you think this would work? Btw I am using the Software Serial Library.Thanks!

2

Yes! The setup will work!

3

GolamMostafa:
Yes! The setup will work!

Would still this work with different baud rates? for hc-12 I m using 9600 while 38400 for the hc-05 as default. attached here is the code. However, I wasn't able to print out the data in the serial monitor and no data was sent by the bluetooth. but when I comment the line BTSerial.begin(38400) it prints out the receiving data. attached here is my code. Thanks.

receive-send.ino (2.89 KB)

4

Read the how to use this forum stickies to post your code in the proper manner, clicking code tags </>. You will have to use a separate serial port for the HC-05. The default communications speed of HC-05 is 9600.

5

@OP

Make simple test as per following steps and then add your ideas/complexities.

1. UNO with H12 via Software Serial Port (SUART Port); UNO-SM (Serial Monitor) via UART Port; UNO and NANO via HC12 + HC12.

2. NANO with H12 via SUART Port; NANO-SM via UART Port; NANO with Android via SUART based HC05.

Codes for UNO: (untested)

#include<SoftwareSerial.h>
SoftwareSerial SUART(10, 11); //SRX = DPin-10. STX = DPin-11

void setup()
{
   Serial.begin(9600);
   SUART.begin(9600)
} 

void loop()
{
   SUART.print('A')
   delay(1000);     //
}

Codes for NANO: (untested)

#include<SoftwareSerial.h>
SoftwareSerial SUARTHC12(10, 11);
SoftwareSerial SUARTHC5(4, 5);

void setup()
{
   Serial.begin(9600);
   SUARTHC12.begin(9600);
   SUARTHC5.begin(9600);
}

void loop()
{
   bytr n = SUARTHC12.available();
   if(n !=0)
   {
       byte x = SUARTHC12.read(); //read from HC12
       Serial.write(x);     //check tha A has appeared on SM
       SUARTHC5.write(x);              //check that A has appeared on the screen of Android Phone
    }
}

3. Upload the above sketches into UNO and NANO and check that the results above appeared as expected.

Please, post the results.

BTW; Connevt STX-pin of NANO with RX-pin Bluetooth using a voltage divider. RX-pin of BT is not 5V tolerant.