3 X 4 Matrix Keypad 12 Buttons Keyboard Module Array Switch Tactile Keypad for Arduino Microcontroller

3 X 4 Matrix Keypad 12 Buttons Keyboard Module Array Switch Tactile Keypad for Arduino Microcontroller
Click image for Gallery
  • Product Code: FZ0840B- 3 X 4 Matrix keypad
  • Availability: In Stock
  • $8.99
  • Ex Tax: $8.99
  • Price in reward points: 2
  • 2 or more $6.99
  • 5 or more $4.99
  • 10 or more $3.99
  • 30 or more $2.99
- +



Tags: 3 x 4, Matrix Keypad, Keyboard

Description:
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad.
First, ignore the sellers numbering. There's a mistake in it. Second, know that the first and last position on the keypad terminals are not being used so my keypad numbering goes like this:
X 1 2 3 4 5 6 7 X

Third, Arduino pin numbers 0 and 1 are generally not used for the keypad so start with 2 - 8. The corresponding pin numbers to wire to the keypad are as follows:
X 7 2 6 5 8 4 3 X

The correct row and col are as follows:
X C2 R1 C1 R4 C3 R3 R2 X

This means when you create your code (sketch), the lines of code that designate the Arduino pins being used for the key pad are as follows:
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {6, 7, 8};

Package included:
1 X Matrix Keypad 3X4

Write a review

Note: HTML is not translated!
    Bad           Good

Related Products