// allows for simultaneous connection of a NC tool offset length probe 
// and the basic NO 3 axis touch plate probe with the Blackbox X32 CNC controller.

// Wire Arduino output 4 to probe input on the X32. Power the Arduino using 5v from  
// the X32 probe connection. Ground the Arduino to the X32 Probe ground connection.
// Do not apply any other power source to the Arduino or Arduino input circuitry.

// The 5v supply to the LED is for demonstration purposes only; the LED represents X32 touch input.

void setup() {
  
  //configure input pins and enable the internal pull-up resistor
  pinMode(2, INPUT_PULLUP); //TLO Probe NC
  pinMode(3, INPUT_PULLUP); //3 Axis Touch Plate Probe NO
  
  //configure output pins
  pinMode(4, OUTPUT); //TLO & Probe NO - Connect to X32 Probe Input
  }

void loop() {
  //read the input values into variables
  int TLO = digitalRead(2);
  int Probe = digitalRead(3);
 

  // The pull-up resistor means the input logic is inverted. It goes
  // HIGH when the input is open, and LOW when the input is closed.

  // If the Probe is closed or the TLO is opened the Probe Output is closed. 
  if (TLO == HIGH || Probe == LOW) {
    digitalWrite(4, LOW);
  } else {
    digitalWrite(4, HIGH);
  }
}