Pad5buttons

---. date: 15/10/14

---

Pad 5 boutons

Objectif

Lire sur le port séries les valeurs de chaque bouton actionné.

Liste de matériel

• Arduino
• Pad 5 buttons

Schéma

Pad	Arduino
OUT	A0
VCC	3.3V
GND	GND

Code

/*
5 button Keypad Tester
*/

// Global Variables
const byte NONE = 0;
const byte LEFT = 1;
const byte UP = 2;
const byte RIGHT = 3;
const byte DOWN = 4;
const byte SELECT = 5;

const byte keypadPin = A0;
byte key = 0;

void setup() 
{
  Serial.begin(9600); 
  while (!Serial)   {  ;    }
  Serial.println(F("Start\n"));
  pinMode(keypadPin, INPUT_PULLUP); // sets analog pin for input 
}

void loop()
{
    key = getKey();
    if (key==LEFT)    { Serial.println("LEFT"); }
    if (key==RIGHT)   { Serial.println("RIGHT"); }
    if (key==UP)      { Serial.println("UP"); }
    if (key==DOWN)    { Serial.println("DOWN"); }
    if (key==SELECT)  { Serial.println("SELECT"); }
    if (key==NONE)    { Serial.println("NO KEY PRESSED"); }
    delay(100);
} 


/*
Key Values
Left / First button = 15
Up / Second button = 72
Down / Third = 124
Right / Forth = 170
Select / Fifth = 212
No button pressed = 1021

Because the values change depending on the actual components and even the temperature we need to test for a range of values. 
I tend to use +/- 20. This gives:
Left - 0 to 35
Up - 52 to 92
Down - 104 to 144
Right - 150 to 190
Select - 192 to 232
*/
byte getKey()
{
    int val = 0;
    byte button = 0;
    val = analogRead(keypadPin);
    // Serial.println(val); // Use to calibration, print value 
    button = NONE; // use NONE as the default value
    if ( val <= 35)  {  button = LEFT; }                                // left
    else if ( (val >= 150)  &&  (val <=160)    )   {  button = UP;  }     // up
    else if ( (val >= 340) &&  (val <= 350 ) )   {  button = DOWN;  }   // down
    else if ( (val >= 520) &&  (val <= 525)  )   {  button = RIGHT;  }  // right
    else if ( (val >= 750) &&  ( val <=755)  )   {  button = SELECT;  } // select
    return button; 
}  

Précisions

Date de réalisation