Mit dem Mega2560 und kRPC Kerbal Space steuern.

#include <Keypad.h>

const byte numRows= 4; 

const byte numCols= 4; 

char keymap[numRows][numCols]= 

{

  {'0', '4', '8', 'C'}, 

  {'1', '5', '9', 'D'}, 

  {'2', '6', 'A', 'E'},

  {'3', '7', 'B', 'F'}

};

byte rowPins[numRows] = {53,51,49,47}; //Rows 0 to 3

byte colPins[numCols]= {45,43,41,39}; //Columns 0 to 3

byte inbyte;

byte throttle_p;

byte throttle_m;

byte stage;

Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup()

{

  Serial2.begin(9600);

  Serial.begin(9600); 

  throttle_p=1;

  throttle_m=2;

  stage=3;

}

void loop()

{

  char keypressed = myKeypad.getKey();

  if (Serial2.available()){

    inbyte = Serial2.read();

    Serial.write(inbyte);

  }

  if (keypressed =='0') {

    Serial2.print(throttle_p);

  } 

  if (keypressed =='1') {

    Serial2.print(throttle_m);

  } 

  if (keypressed =='2') {

    Serial2.print(stage);

  } 

}