This tutorial will show you how to make two ARDUINO Microcontroller boards serial communicate with each other…

Click on video below for full tutorial..

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ARDUINO Sketches:

Transmitter:

int val;
#define button 2
void setup() {
Serial.begin(9600);
pinMode(button,INPUT);
}

void loop() {
val = digitalRead(button);
if (val == HIGH)
{
Serial.write(100);
delay(250);
}
}

Receiver:

#define led 2
int val;
int pos = 0;
void setup() {
Serial.begin(9600);
pinMode(led,OUTPUT);

}

void loop() {
if (Serial.available() > 0)
{
val = Serial.read();
if (val == 100 && pos == 0)
{
digitalWrite(led, HIGH);
pos = 1;
}
else if (val == 100 && pos == 1)
{
digitalWrite(led, LOW);
pos = 0;
}

}
}