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Topic: Trouble with a keypad (Read 1 time) previous topic - next topic


Feb 20, 2013, 11:20 pm Last Edit: Feb 20, 2013, 11:26 pm by Derkatwork Reason: 1
I have thoroughly read the other 4x4 keypad related threads in this forum and I'm still having trouble.  I'm using this keypad (http://www.amazon.com/Universial-Switch-Keypad-Keyboard-Arduino/dp/B008A30NW4).  I have the pins hooked up from left to right as 2,3,4,5,7,8,9,10 in the PWM area on an arduino ATMEGA 1280.  The code is as follows:
Code: [Select]
#include <Keypad.h>

const byte ROWS=4;
const byte COLS=4;


byte rowPINS[ROWS]={2,3,4,5};
byte colPINS[COLS]={7,8,9,10};

Keypad KEYPAD=Keypad(makeKeymap(KEYS),rowPINS,colPINS,ROWS,COLS);

void setup(){

void loop(){
 char KEY=KEYPAD.getKey();

 if(KEY != NO_KEY){

I'm not sure what the problem is and every tutorial says the same thing.  I just got the keypad in the mail today.  I'll explore google a little more while I'm waiting, but any help is greatly appreciated.  Thanks in advance.

EDIT: Forgot to mention a big part.  When hooking up to my computer, I open the serial monitor and nothing is displayed when a key is pressed.  I have looked at this thread (http://arduino.cc/forum/index.php/topic,112078.0.html), and near the bottom of the first page, I have seen the wire diagram they advised.  I did try this and the same nothing was what I got.


I've got one of those hooked to a Mega 2560 laying right here on the arm of my chair.

The 4 traces on the right are the column pins. The 4 traces on the left are the row pins.

Mine is working perfectly. Double check your wiring is all I can suggest.
The art of getting good answers lies in asking good questions.


I'm going to try with different wires. I did double check my wiring.  After that, I'll contact amazon and try to return/get a new keypad.  That's all I can think of that's left.  Again, the wires are in the places I stated in the code.  So even if they weren't in the correct spots, I would still get some output (even if it's the wrong one).

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