Sending a value with range (0-1023) in arduino to another arduino

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1

Is there possible to not using Serial tx rx to do the communication? The serial communication between arduino is kind of trouble due to the maximum transmission size of 1 byte , and i need the value cost at least 2 byte.

2

you can transmit a 16bt integer in binary as two bytes and a float as four bytes
see post #11 of
Java to Arduino - transmit float as 4 bytes

3

hk199899:
Is there possible to not using Serial tx rx to do the communication? The serial communication between arduino is kind of trouble due to the maximum transmission size of 1 byte , and i need the value cost at least 2 byte.

You can use lowByte and highByte

void loop()
{
  static int number = 0;

  Serial.write(highByte(number));
  Serial.write(lowByte(number));

  number++;

  if (number == 1024)
    number = 0;
  delay(100);
}

Recombine at the other side.

4

sterretje:
the combination of two byte is like this?

void loop()

{
  byte higherbyte , lowerbyte;
  int number;

higherbyte = Serial.read();
  lowerbyte = Serial.read();

number = (higherbyte<<8)+lowerbyte;

}

5

some sample code

// encode 16 bit int as two bytes and decode

void setup() {
   Serial.begin(115200);
   Serial.setTimeout(60*60*1000ul);
}

// encode 16 bit unsigned integers data into two bytes (characters)
void intEncode(byte ch[2], const unsigned int data)
{
     ch[0]= (data>>8) & 0xff;   // top byte of data
     ch[1]=data & 0xff;         // lower 8 bits of data
 }

// decode the above data
void intDecode(const byte ch[10], unsigned int *data)
{
    *data=(ch[0] << 8) | ch[1];
}

void loop() {
            unsigned int i, x={0},y;
            byte ch[2];
            Serial.print("enter an unsigned int ? ");
            x=Serial.parseInt();
            intEncode(ch, x);           // encode int as two bytes
            Serial.print("\nencoded characters ");
            for(i=0;i<2;i++)            // print the bytes
               { Serial.print(" " ); Serial.print(ch[i], HEX);}
            intDecode(ch, &y);          // decode bytes to an int
            Serial.print("\ndecoded data ");
            Serial.println(y);
}

a run gives

enter an unsigned int ? 67
encoded characters  0 43
decoded data 67
enter an unsigned int ? 7896
encoded characters  1E D8
decoded data 789625678
enter an unsigned int ? 
encoded characters  64 4E
decoded data 25678