EnigmaCypher7:
I'll assume that the code above is on the master.
I know it's inellegant, but this is the way I'd do it to test the idea.
Connect pins 2 on the master to pins 6 (set as input) on the slave, through a 1K resistor.
Connect pins 3 on the master to pins 7 (set as input) on the slave, through a 1K resistor.
(to avoid confusion I've used different pins, but you could use any available)
code for the slave
if (digitalRead(pin6)==HIGH){ //look to see what level master pin 2 is at
digitalWrite(LEDpin,HIGH); //turn on LED
digitalWrite(pin7, HIGH); //signal back to master pin 3 that job done.
}
else{
digitalWrite(LEDpin,LOW); //turn off LED
digitalWrite(pin7, LOW); //signal back to master pin 3 that job done.
}
For master
switch (inByte) {
\\ Light up a Led on slave as a Test
case 'q':
digitalWrite(2, HIGH);
delay (1); //Give time for the slave to reply
if(digital read(3)==HIGH){ //Look at slave's pin 7 to see if job done
Serial.println("Slave's LED On");
}
break;
case 'w':
digitalWrite(2, LOW);
delay (1); //Give time for the slave to reply
if(digital read(3)==LOW){ //Look at slave's pin 7 to see if job done
Serial.println("Slave's LED Off");
}
break;