How to transfer data using Wire.h header and i2c protocol? Below the code it's only transferring address and not transferring data. Help me

[dulamsuren]

I'm taking Clock data(SCL) from A5 and SDA from A4 port in Arduino UNO board. The code below is used to transfer 8 bit signal and illustrating signal on oscilloscope. The problem is that the 8 bit data vis not transferring and only transferring address bits. Please help me.

#include <Wire.h>

void setup()
{
  
Wire.begin();

 // join i2c bus (address optional for master)

}
//byte x = 0;

void loop(){
  
Wire.beginTransmission(170);
  Wire.write(1);
Wire.write(0x07); // sends five bytes
Wire.endTransmission(); // stop transmitting

/*x++;        // increment value
  if (x == 127) { // if reached 64th position (max)
    x = 0;    // start over from lowest value
  }*/
delay(10);
}

[DrDiettrich]

@dulamsuren

The problem is that the 8 bit data vis not transferring and only transferring address bits.

The transmission is aborted because no slave responded.
For testing purpose a broadcast (address 0) may work?

[GolamMostafa]

1. Connect UNO and NANO/UNO as per following diagram using I2C Bus. Don't forget to install the pull-up resistors.

2. Upload the following sketch (your one) in UNO-Master.

#include <Wire.h>

void setup()
{
    Wire.begin();
}

void loop()
{
  Wire.beginTransmission(170);
  Wire.write(1);
  Wire.write(0x07); // 
  Wire.endTransmission(); // stop transmitting
  delay(1000);  //test interval
}

3. Upload the following sketch in NANO/UNO-Slave.

#include <Wire.h>
volatile bool flag = false;
byte myData[2];

void setup()
{
  Serial.begin(9600);
  Wire.begin(170);
  Wire.onReceive(receiveEvent);
}

void loop()
{
  if(flag == true)
  {
    Serial.println(myData[0]); //shows: 1 (01)
    Serial.println(myData[1]); //shows: 7 (07)
    flag = false;
  }
}

void receiveEvent(int howMany)
{
  for(int i = 0; i<howMany; i++)
  {
    myData[i] = Wire.read();
  }
  flag = true;
}

4. Check that Serial Monitor of Slave shows: 1 and 7.

[dulamsuren]

thank you