Odd behavior with a 5 buttons keypad (no press value different from 0)

[s-celles]

Hello,

I bought a 5 buttons keypad like https://fr.aliexpress.com/item/2044851328.html?gatewayAdapt=glo2fra&spm=a2g0o.9042311.0.0.277c6c37tAJ6Zn

and run the following code

#include <ezAnalogKeypad.h>
// #include <Keyboard.h>

#define PIN_ANALOG_KEYPAD_5BUT A0

ezAnalogKeypad keypad_5but(PIN_ANALOG_KEYPAD_5BUT);

void setup() {
  Serial.begin(9600);

  keypad_5but.setNoPressValue(1023);  // analog value when no key is pressed
  keypad_5but.registerKey('w', 145);  // sw2 (up) 119
  keypad_5but.registerKey('z', 330);   // sw3 (down) 122
  keypad_5but.registerKey('a', 0);   // sw1 (left) 97
  keypad_5but.registerKey('d', 506);   // sw4 (right) 100
  keypad_5but.registerKey('s', 742);   // sw5 (but) 115

  keypad_5but.setDebounceTime(100);

  // Keyboard.begin();
}

void loop() {
  //Serial.println(analogRead(PIN_ANALOG_KEYPAD_5BUT));

  unsigned char button_k5 = keypad_5but.getKey();
  if (button_k5) {
    Serial.print("The button ");
    Serial.print(char(button_k5));
    Serial.println(" is pressed");
    switch (button_k5) {
      case 'w':
        Serial.println("UP");
        //Keyboard.press(KEY_UP_ARROW);
        break;
      case 'z':
        Serial.println("DOWN");
        //Keyboard.press(KEY_DOWN_ARROW);
        break;
      case 'a':
        Serial.println("LEFT");
        //Keyboard.press(KEY_LEFT_ARROW);
        break;
      case 'd':
        Serial.println("RIGHT");
        //Keyboard.press(KEY_RIGHT_ARROW);
        break;
      case 's':
        Serial.println("p");
        //Keyboard.press('p');
        break;
      default:
        break;
    }
    delay(100);
    //Keyboard.releaseAll();
  }
}

when pressing SW1 (left arrow) the following text is shown on console

The button a is pressed
LEFT
The button z is pressed
DOWN

I was expecting only

The button a is pressed
LEFT

I don't uderstand why DOWN is also displayed.

Any idea? is it a problem with the library ?

Kind regards

PS : library works fine with analog 4x4 keypad https://github.com/scls19fr/condor_sim_keypad_4x4

[ArduinoGetStarted]

Hello,
Did you do the calibration to get the exact value when no key is pressed and when each key is pressed ?

[s-celles]

Yes I did it and when no key is pressed I get 1023
145 when SW2 (up) key is pressed ...

[ArduinoGetStarted]

@scls19fr I am sorry for the late reply.
I tried to find the reason but I cannot find any clue. The source code seem to be ok. It will keep this issue open. If someone else meets the same issue, I will order the keypad to check if there is any problem with the hardware.

Have a great day!

[s-celles]

Thanks @ArduinoGetStarted
If tolerance was a variable changing it would be easier and I could try with a different value (smaller).
I haven't try changing it directly from 100 to 20 (for example) into your code.