Replace Ramps LCD by button

Hello All,

I am working on my first 1.6 Ramps, with Arduino Mega and 3 stepper motors + A4988 drivers ( 3 axes X Y Z). I will not pilot them via Marlin firmware, but only with Accelstepper library (I am not building a 3D printer). My goal is to pilot the motors, using push buttons. The problem is, I don't know where to connect the buttons ?
Since I won't be using LCD / endstops / servos, I have plenty of pins available on the Ramps, but I don't know how to adress them in my code. For exemple : Pins D16 to D32 are free, but the Arduino won't recognize "D16".

I found the "Mega2560 pinout" but I can't find out what Mega's pin is linked to Ramps D16 pin. Thank you for your help.

Rick

the ramps pins use the same names as the mega pins

D16 on ramps is D16 on the mega

you dont use the D when coding....

eg

/*
  Button

  Turns on and off a light emitting diode(LED) connected to digital pin 13,
  when pressing a pushbutton attached to pin 16.

  The circuit:
  - LED attached from pin 13 to ground
  - pushbutton attached to pin 16 from +5V
  - 10K resistor attached to pin 16 from ground

  - Note: on most Arduinos there is already an LED on the board
    attached to pin 13.

  created 2005
  by DojoDave [www.0j0.org]
  modified 30 Aug 2011
  by Tom Igoe

  This example code is in the public domain.

  [www.arduino.cc]
*/

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 16;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}

Hello Dust,

I can't believe it was that simple
Thank you for your help.

Rick