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From Commodious Finch, 3 Years ago, written in C.
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  1. #include "Keyboard.h"
  2. #include <Keypad.h>
  3. void setup() {
  4.   // put your setup code here, to run once:
  5.   pinMode(A0, INPUT);
  6.   pinMode(6,INPUT);
  7.   pinMode(7,INPUT);
  8.   pinMode(8,INPUT);
  9.   pinMode(9,INPUT);
  10.   pinMode(4,OUTPUT);
  11.   pinMode(5,OUTPUT);
  12.   pinMode(A3,OUTPUT);
  13.   Serial.begin(9600);
  14. }
  15.  
  16. void loop() {
  17.   // put your main code here, to run repeatedly:
  18.  
  19.   if (digitalRead(A0) ==HIGH  or digitalRead(18)==HIGH){
  20.     Serial.println("hello");
  21.    
  22.    
  23.   }
  24.  
  25.   digitalWrite(4, HIGH);
  26.   if (digitalRead(6) == HIGH){
  27.     Serial.println("A key was pressed in row one, column one");
  28.     delay(100);
  29.   }
  30.   digitalWrite(4,LOW);
  31.   digitalWrite(5,HIGH);
  32.   if (digitalRead(7) == HIGH){
  33.     Serial.println("A key was pressed in row two, column two");
  34.     delay(100);
  35.   }
  36. }