Can't find HC-12 module

Projects Programming
1

Hello, I have an Arduino UNO connected to an HC-12 bluetooth module like this:

962×1034 76.9 KB

The goal is to communicate between RPi3 and the Arduino with bluetooth.
I'm running it with this code:

#include <SoftwareSerial.h>

char data = 0;            //Variable for storing received data
void setup()
{
    Serial.begin(9600);   //Sets the baud for serial data transmission                             
    pinMode(13, OUTPUT);  //Sets digital pin 13 as output pin

}
void loop()
{
   if(Serial.available() > 0)      // Send data only when you receive data:
   {
      data = Serial.read();        //Read the incoming data & store into data
      Serial.print(data);          //Print Value inside data in Serial monitor
      Serial.print("\n");        
      if(data == '1')              // Checks whether value of data is equal to 1
         digitalWrite(13, HIGH);   //If value is 1 then LED turns ON
      else if(data == '0')         //  Checks whether value of data is equal to 0
         digitalWrite(13, LOW);    //If value is 0 then LED turns OFF
   }
}

The problem is I can't find my HC12 module with my Android or my Raspberry PI.
Any help would be apreciated! :slight_smile:

2

Your code is either junk, or it is incomplete - or possibly both. You have called for Software serial but you are not using it.

Your procedure to use Android is probably very different to that for Raspberry Pi. I assume Raspberry doesn't have a master bluetooth built-in and you need another like that on Arduino, and they both need to be configured to talk to each other. Have you done that? Bluetooth does/should not need to be configured to talk to Android. Can Android see it when the power is connected?

I suggest you leave Raspberry out of the game until you know what you are doing.

All of the above assumes that your "HC-12 bluetooth module" is indeed a bluetooth module, and I'm not sure about that. If in fact it isn't, I guess that goes quite some way to explain why Android cannot see it.

3

Any help would be apreciated!

It may be unrealistic to expect the Arduino to power the bluetooth module, especially from the 3.3V pin. Which module do you have?

4

Some resellers claim HC-12 is Bluetooth but in fact, it's NOT. So that's logical you can't see it on Android.
If you want to control a "robot" (eg) at long distance, you have to build 2 devices: one for the robot with the HC-12 and a second one, near the Android, which have a HC-12 (so receving data from the robot) and a HC-05 (which is a real Bluetooth module) to communicate with the Android.

5

PedroStil:
The goal is to communicate between RPi3 and the Arduino with bluetooth.

As others have said, the HC-12 is not a Bluetooth module.

Dont know if they are avaialble on all the ISM bands, but my HC-12s are on 433Mhz.

6

PedroStil:
The problem is I can't find my HC12 module with my Android or my Raspberry PI.

I normally use a torch. And it is usually in the rear left corner of the third drawer. Under the box of screws.

...R

7

Hi,
Welcome to the forum.
If you look at the title of the article you got the diagram and read the article, it will tell you what you have,

www.14core.com/wiring-the-hc11-hc12-434433mhz-transceiver/

Tom... :slight_smile: