ejshea
Published © GPL3+

Displaying Key Pressed on Serial Monitor

Take input from a 16-key keypad and send it to the IDE's built-in Serial Monitor.

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Displaying Key Pressed on Serial Monitor

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Final Schematic

Code

Sending Data from Uno to Host

Arduino
//Read input from keypad and write key pressed to serial terminal

//variable declarations
int button1 = 0;
int button2 = 0;
int button3 = 0;
int buttonA = 0;
int button4 = 0;
int button5 = 0;
int button6 = 0;
int buttonB = 0;
int button7 = 0;
int button8 = 0;
int button9 = 0;
int buttonC = 0;
int buttonAst = 0;
int button0 = 0;
int buttonHash = 0;
int buttonD = 0;

char ast = '*';
char hash = '#';
char Alfa = 'A';
char Bravo = 'B';
char Charlie = 'C';
char Delta = 'D';

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);   //configure serial port to 9600 baud
  
  //set pins 2-5 as output
  for (int i = 2; i < 6; i++){
    pinMode(i, OUTPUT);
  }
  
  //set pins 6-9 as input
  for (int i = 6; i < 10; i++){
    pinMode(i, INPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  
  digitalWrite(2, HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)
  button1 = digitalRead(6);
  button4 = digitalRead(7);
  button7 = digitalRead(8);
  buttonAst = digitalRead(9);
  digitalWrite(2, LOW);    //set pin 0 low
  
  if(button1 == 1){
    delay(150);   //wait until switch settles
    
    Serial.println(1);
  }

  if(button4 == 1){
    delay(150);   //wait until switch settles

    Serial.println(4);
  }

  if(button7 == 1){
    delay(150);   //wait until switch settles

    Serial.println(7);
  }

  if(buttonAst == 1){
    delay(150);   //wait until switch settles

    Serial.println(ast);
  }

  digitalWrite(3, HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)
  button2 = digitalRead(6);
  button5 = digitalRead(7);
  button8 = digitalRead(8);
  button0 = digitalRead(9);
  digitalWrite(3, LOW);    //set pin 0 low
  
  if(button2 == 1){
    delay(150);   //wait until switch settles
    
    Serial.println(2);
  }

  if(button5 == 1){
    delay(150);   //wait until switch settles

    Serial.println(5);
  }

  if(button8 == 1){
    delay(150);   //wait until switch settles

    Serial.println(8);
  }

  if(button0 == 1){
    delay(150);   //wait until switch settles

    Serial.println(0);
  }

  digitalWrite(4, HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)
  button3 = digitalRead(6);
  button6 = digitalRead(7);
  button9 = digitalRead(8);
  buttonHash = digitalRead(9);
  digitalWrite(4, LOW);    //set pin 0 low
  
  if(button3 == 1){
    delay(150);   //wait until switch settles
    
    Serial.println(3);
  }

  if(button6 == 1){
    delay(150);   //wait until switch settles

    Serial.println(6);
  }

  if(button9 == 1){
    delay(150);   //wait until switch settles

    Serial.println(9);
  }

  if(buttonHash == 1){
    delay(150);   //wait until switch settles

    Serial.println(hash);
  }

   digitalWrite(5, HIGH);   //set pin 0 high
  //check if input pins go high (button pressed)
  buttonA = digitalRead(6);
  buttonB = digitalRead(7);
  buttonC = digitalRead(8);
  buttonD = digitalRead(9);
  digitalWrite(5, LOW);    //set pin 0 low
  
  if(buttonA == 1){
    delay(150);   //wait until switch settles
    
    Serial.println(Alfa);
  }

  if(buttonB == 1){
    delay(150);   //wait until switch settles

    Serial.println(Bravo);
  }

  if(buttonC == 1){
    delay(150);   //wait until switch settles

    Serial.println(Charlie);
  }

  if(buttonD == 1){
    delay(150);   //wait until switch settles

    Serial.println(Delta);
  }
}

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ejshea

ejshea

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