oneBit Send

int buttonPin = 2; //digital pin 2
int lastRead = LOW;

void setup(){
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH); //turn on internal pull-up resistor

  Serial.begin(9600);
}




void loop(){
  sendReading(); //send reading from button
}



void sendReading(){
  //read the digital pin, send a value only if it has changed
  int buttonValue = digitalRead(buttonPin);

  //We ONLY want to send changes so the serial buffer does not overflow with unneeded values
  if(buttonValue == HIGH && buttonValue != lastRead){
    send(1);
    lastRead = buttonValue;
  }
  else if(buttonValue != lastRead){
    lastRead = buttonValue;
    send(0);
  }
}


void send(int value){
  value = constrain(value, 0, 255);
  Serial.write(value);
}