Matrix keypad library not working Properly

Using Arduino Programming Questions
1

In the below Program "Release" and "Idle" are not working...
i have connected all rows and columns correctly...

ANY HELP???????????????????????????

#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the kpd
byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the kpd

Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

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

void loop(){

// Fills kpd.key[] array with up-to 10 active keys.
// Returns true if there are ANY active keys.
if (kpd.getKeys())
{
for (int i=0; i<LIST_MAX; i++) // Scan the entire list.
{
if (kpd.key*.kchar != NO_KEY) // Test for an active key.*

  • {*
    _ switch (kpd.key*.kstate) { // Test for key state IDLE, PRESSED, HOLD, or RELEASED*_
    * case HOLD:*
    * Serial.print("Key ");*
    _ Serial.print(kpd.key*.kchar);
     Serial.print(" is being HELD and the state ");
    if (!kpd.key.stateChanged)
    Serial.println("has not changed.");
    else*
    * Serial.println("has changed.");
    break;
    case PRESSED:
    Serial.print("Key ");
    Serial.print(kpd.key.kchar);
    Serial.print(" is PRESSED and the state ");
    if (!kpd.key.stateChanged)
    Serial.println("has not changed.");
    else*
    * Serial.println("has changed.");
    break;
    case RELEASED:
    Serial.print("Key ");
    Serial.print(kpd.key.kchar);
    Serial.print(" has been RELEASED and the state ");
    if (!kpd.key.stateChanged)
    Serial.println("has not changed.");
    else*
    * Serial.println("has changed.");
    break;
    default:
    Serial.print("Key ");
    Serial.print(kpd.key.kchar);
    Serial.print(" is IDLE and the state ");
    if (!kpd.key.stateChanged)
    Serial.println("has not changed.");
    else*
    * Serial.println("has changed.");
    }
    }
    }
    }
    } // End loop*_
2

khkarthik:
In the below Program "Release" and "Idle" are not working...

What, exactly, do you mean by 'not working'?

3

I have connected the matrix key pad ...and when I press any key....I get the msg on my serial console as "pressed " and when I continue to hold ..I get the msg as "hold "...

but when I release the key...I'm not getting the " release " msg ...

I mean to say that ....in the switch case...the program is never entering the "release " and " idle " case...

I don't know wat could be the problem...either with the code which I've posted.. or with the keypad library ....

4

You're likely to get better help if you observe these simple rules:

Don't cross-post (don't worry, I've deleted the duplicate of this one)

Don't SHOUT or allow your punctuation keys to auto-repeat...

Use code tags when posting code, so your code is legible.

it is all set out here - I'm really surprised you didn't see it.

5

khkarthik:
I don't know wat could be the problem.

My first guess is:

  if (kpd.getKeys())
  {

Perhaps a Released key is not considered 'active' so this returns 'false'.