Single Line Communication

One Wire Communication

What you need?

• minumum 2 Arduinos

• Jumper wires

The code is so short that I did not make a library. Interruption ensures that messages are read. Reading does not work while sending. I will continue to develop, this is just a demo. The bits are sent every 50 microseconds. In front of it, a bit of signal prepares for the reading of the arduino. The data can be read from the variable "data". And messaging is possible as follows.

transmit(val); //val is a byte-type variable

The default communication pin is pin 2 because most Arduino board pin 2 supports interruption.

It is important that the ground is connected to the Aruinos.

Circuit

Arduino 1 Arduino 2

pin 2------------pin 2

GND------------GND

If you are interested in more interesting projects, then follow me and see my previous projects.

#define pin 2
byte data;
void setup()
{
 Serial.begin(9600);
 begin();            //prep. the comm.
}
void loop()
{
 transmit(42);      //send number 42
 delay(500);
}
/*
  ############################
  #  #####   #        #####  #
  # ##       #       #       #
  #  ####    #      #        #
  #     ##   #       #       #
  # #####    #####    #####  #
  ############################
    by Turai Botond
*/
void begin()
{
 pinMode(pin, INPUT);
 attachInterrupt(digitalPinToInterrupt(pin), _inmsg, RISING);
}
void _inmsg()
{
 detachInterrupt(digitalPinToInterrupt(pin));
 if (digitalRead(pin) == 1)
 {
   while (digitalRead(pin) == 1)
   {}
   delayMicroseconds(75);
   for (int i = 0; i < 8; i++)
   {
     bitWrite(data, i, digitalRead(pin));
     delayMicroseconds(50);
   }
 }
 attachInterrupt(digitalPinToInterrupt(pin), _inmsg, RISING);
}
void transmit(byte dat)
{
 detachInterrupt(digitalPinToInterrupt(pin));
 pinMode(pin, OUTPUT);
 digitalWrite(pin, 1);
 delayMicroseconds(50);
 digitalWrite(pin, 0);
 delayMicroseconds(50);
 for (int i = 0; i < 8; i++)
 {
   digitalWrite(pin, bitRead(dat, i));
   delayMicroseconds(50);
 }
 delayMicroseconds(200);
 pinMode(pin, INPUT);
 attachInterrupt(digitalPinToInterrupt(pin), _inmsg, RISING);
}

Have fun :)