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SENSORS / TOUCH / 3X4 PHONE-STYLE MATRIX KEYPAD
DESCRIPTION
Hey, Jenny, I've got your number! And I'm going to dial 867-5309 into this very nice phone-style
matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of
plastic with sturdy plastic buttons. The keys are connected to a matrix so you only need 7
3x4 Phone-style Matrix
Keypad
PRODUCT ID: 1824
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DESCRIPTION
TECHNICAL DETAILS
microcontroller pins (3-columns and 4-rows) to scan through the pad.
There's a great Matrix Keypad Arduino library that should work great with this item with minor
adjustments. It's basically a sturdier version of our Membrane 3x4 Matrix Keypad and comes
with 7 or 8 header pins pre-soldered on for easy plugging. Starting from the left there are three
column pins, and then to the right are the four row pins. If yours has an 8th pin, its not used and
you can just leave it disconnected
TECHNICAL DETAILS
Force: 160-180g
Contact Resistance: <100Ω
Weight: 23g
There is a very nice Matrix Keypad Arduino library that works great with this item. The only thing
we suggest is to change the initialization code in the examples to this:
#include "Arduino.h"
#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, 6, 7, 8}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {2, 3, 4}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup(){
Serial.begin(9600);
}
void loop(){
char key = keypad.getKey();
if (key != NO_KEY){
Serial.println(key);
}
}
This will swap the * and # keys and also let you connect to the Arduino with all the pins in
order/in a row starting from digital 2 thru digital 9
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