2 x 2 Matrix 4 Push Button Keyboard Module


In stock

SKU: 420055
  1. 2×2 Matrix Keyboard Module with 4 buttons
  2. Small in size and hence Save space
  3. More convenient to use
  4. Expanded development application modules for single chip
  5. With 4 keys and 4 pin


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Brand: Generic
Category: Electronic Switches/Keypads Modules

The 2×2 matrix keypad module usually is used as input in a project. It has 4 keys in total, which means the same input values. The module is a non-encoded matrix keypad consisting of 14 keys in parallel. The keys of each row and column are connected through the pins outside – pin R1-R2 as labeled beside control the rows, when L1-L2, the columns.

It consists of microswitch buttons. The module has four holes 3mm (M3) holes for mounting. The pin designations on each PCB are shown on each PCB. Two pins are thus used as an ‘x’ coordinate and the other 2 as a ‘y’ coordinate.
The module is already equipped with a soldered pin-headers (rotated 90 degrees)

How it Works:

First test whether any key is pressed down. Connect power to rows, so they are High level. Then set all the rows R1-R2 as Low and then detect the status of the columns. Any column of Low indicates there is key pressing and that the key is among the 4 keys of the column. If all columns are High, it means no key is pressed down. Next, locate the key. Since the column in which the pressed key lies is identified, knowing the line would finalize the testing. Thus, set the rows as Low in turns until any is unveiled accordingly – other rows will still be High.
Now the row can be identified. Detect the status of each column in turns. The column tested Low is the one intersecting with the line – their cross point is just the key pressed.


  1. 2×2 matrix keypad module with 4 buttons
  2. Small in size and hence Save space
  3. More convenient to use
  4. Expanded development application modules for single chip
  5. With 4 keys and 4 pins.

Package Includes:

1 x 2*2 Matrix Keypad Module

SKU: 420055 Category:
Pin Spacing (mm)


Switch Type


Length (mm):


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Weight (g):


Shipping Weight 0.005 kg
Shipping Dimensions 7 × 4 × 2 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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    Please provide step file
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    Q Please provide step file
    Asked by yuvaraj on September 10, 2020 4:02 pm
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Country Of Origin: China