14 pin Keypad?

Projects General Guidance
1

Hi I'm completely new to arduino. I have a 3x4 keypad with 14 pins and I'm wondering how to hook it up. Most of the examples show a 14 pin keypad where usually only 7 work, but on mine all but one of the pins seem to be in use, the first pin is a common ground and pins 3-14 are for the 12 keys.
Would the code be any different from the one in the keypad example and how do I go about changing it? I would also like to know how to connect the keypad to the arduino UNO. Thanks

2

Could he set it up as 1x12 keypad?
Would have the advantage of being able to read multiple presses at one time, which the matrix does not.

3

1x12 would perhaps let the 12 individual buttons be used with the keypad library.

Do something like this.
Or use connect to a shift register, use the interrupt to have a latch pulse created to capture the data & shift it in.

4

Hi,
i have the same issue, i have a 14 pins keypad which pin 8 is the common pin, and the keypad works like this:
p1+p8 = 1
p5+p8 = 2
p11+p8 =3
p2+p8 = 4
p6+p8 = 5
p10+p8 = 6
p3+p8 = 7
p7+p8 = 8
p12+p8 = 9
p9+p8 = 0
p4+p8 = *
p13+p8 = #

i have tried capturing the presses using this code, but with no success:

const int buttonPin[] = { 30, 31, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13 };     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
const int pinCount = 13;
// variables will change:
boolean buttonState = LOW;         // variable for reading the pushbutton status
int delayms = 500;


void setup() {
// initialize the LED pin as an output:
	pinMode(ledPin, OUTPUT);      
	//int thisPin;
	// the array elements are numbered from 0 to (pinCount - 1).
	// use a for loop to initialize each pin as an output:
	for (int thisPin = 0; thisPin < pinCount; thisPin++)  {
		pinMode(buttonPin[thisPin], INPUT);      
	}
	Serial.begin(9600);
}


void loop(){
int thisPin;
while (buttonState == LOW)
	{
		for (thisPin = 0; thisPin < pinCount; thisPin++)
		{
			buttonState = digitalRead(buttonPin[thisPin]);
			if (buttonState == HIGH)
			{	
				buttonState = keyPressed(buttonPin[thisPin]);
			}
		}
	}
}

void flash(int whichPin)
{
	for (int x=0; x <=whichPin; x++)
	{
		digitalWrite(ledPin,HIGH);
		delay(delayms);
		digitalWrite(ledPin,LOW);
	}
}
boolean keyPressed(int thisPin2)
{
	//boolean buttonPress = digitalRead(buttonPin[thisPin2]);
		switch (thisPin2) {
			case 30:    // your hand is on the sensor
				Serial.println("1");
				flash(thisPin2);
				return LOW;
			case 31:    // your hand is close to the sensor
				Serial.println("4");
				flash(thisPin2);
				return LOW;
			case 2:    // your hand is a few inches from the sensor
				Serial.println("7");
				flash(thisPin2);
				return LOW;
			case 3:    // your hand is nowhere near the sensor
				Serial.println("*");
				flash(thisPin2);
				return LOW;
			case 4:    // your hand is on the sensor
				Serial.println("2");
				flash(thisPin2);
				return LOW;
			case 5:    // your hand is close to the sensor
				Serial.println("5");
				flash(thisPin2);
				return LOW;
			case 6:    // your hand is a few inches from the sensor
				Serial.println("8");
				flash(thisPin2);
				return LOW;
			case 8:    // your hand is nowhere near the sensor
				Serial.println("0");
				flash(thisPin2);
				return LOW;
			case 9:    // your hand is close to the sensor
				Serial.println("6");
				flash(thisPin2);
				return LOW;
			case 10:    // your hand is a few inches from the sensor
				Serial.println("3");
				flash(thisPin2);
				return LOW;
			case 11:    // your hand is nowhere near the sensor
				Serial.println("9");
				flash(thisPin2);
				return LOW;
			case 12:    // your hand is nowhere near the sensor
				Serial.println("#");
				flash(thisPin2);
				return LOW;
		}
}

the pin layout on the arduino mega is:
k1 --> p30
k2 --> p31
k3 --> p2
k4 --> p3
k5 --> p4
k6 --> p5
k7 --> p6
k8 --> gnd
k9 --> p8
k10 --> p9
k11 --> p10
k12 --> p11
k13 --> p12
k14 --> p13
any ideas why it's not working?

thanks
Mor