Overview
4x4 membrane matrix keypad is an input device with 16 buttons also known as keys arranged in a grid of four rows and four columns. Typically made from flexible materials like polyester for the top layer and polyethylene for the bottom layer, ensuring durability and flexibility. Also, it has adhesive backing which makes it easy to mount on various surfaces wihout leaving any residue.
How it Works?
Lets understand the working of a 4x4 membrane matrix keypad.
4x4 matrix membrane keypad is based on the connections between its rows and columns where each key connects to a specific row and column, forming a grid that enables the microcontroller to detect which key is pressed by scanning the rows and columns.
Specification
Technical specification for 4x4 membrane matrix keypad - 16 Keys
| Typical Voltage | 3.3 to 5V DC |
|---|---|
| Maximum Voltage | 24V DC |
| Contact Resistance | < 100 ohms |
| Insulation Resistance | 100M ohms |
| Dimensions | 76.9 x 76.9 mm |
| Cable Length | 83.2 mm |
Pinout
Pinout for 4x4 membrane matrix keypad.
| R1, R2, R3, R4 | Connects to respective rows from 1 to 4 |
|---|---|
| C1, C2, C3, C4 | Conencts to respective columns from 1 to 4 |
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