6Pcs 16 Keys Matrix Array Membrane 4×4 Keypad Switch 8pin Keyboard Module Thin Film Switches for Arduino

Price: $5.00
(as of Feb 21, 2023 17:04:15 UTC – Details)

Product Description

Membrane Keypad

How keypad works & How to scan them?

The working principle is very simple. Pressing a button shorts one of row lines to one of column lines, allowing current to flow between them.

Keypad pins are divided into 2 groups: row and column.

The membrane is soft and has a removable paper backing to expose a strong adhesive so you can stick this on an enclosure and feed the cable through a slot.

This keypad work compatible with Arduino, ESP32, ESP8266, Raspberry Pi, or any 5V or 3.3V microcontroller.

Basic Description

1、Electronic Characteristics

Operating voltage: DC35V 1W

Operating current: 100mA

Contact resistance: 10Ω

Insulation resistance: 100MΩ (100VDC)

Dielectric withstand voltage: 250VRms (50-60Hz1min)

Contact jitter time: ≤5ms

2、Mechanical Properties

Service life: <500,000 times

Pin spacing standard: 2.54mm

Line thickness: ≤ 0.13mm

3、Environmental Parameters

Storage temperature: 15°C-35°C

Storage humidity: 70%-90%

Test temperature: 0°C-60°C 16H

Test humidity: 70%-90%

Atmospheric pressure: 86~106kDa

A microcontroller can scan these lines for a button-pressed state. To do this, it follows steps below. Microcontroller sets all column and row lines to input. Then, it picks a row and sets it HIGH. After that, it checks column lines one at a time. If column connection stays LOW, button on the row has not been pressed. Microcontroller knows which row was set HIGH, and which column was detected HIGH when checked. Finally, it knows which button was pressed that corresponds to detected row & column.

Note:

1. You can connect your keypad to any pins you would like. Be careful not to use serial pins (0 and 1) if you are using them for communication.

2. If key presses seem to take a long time to show up then you are probably using long delay()’s in your code. The same thing happens if you use too many small delay()s like delay(10).

3. Make sure you understand pin mappings and have keypad wired up to match. If you wired pins wrongly (and already soldered them in) then you may be able to fix it by redefining pins and/or keymap to make your keypad work.

1×4 Keypad

Keypad dimensions: 69*20mm

Length of cable: 87mm

5-pin 0.1″ pitch connector

Weight: 2.8g

3×4 Keypad

Keypad dimensions: 77*69mm

Length of cable: 85.5mm

7-pin 0.1″ pitch connector

Weight: 5g

4×4 Keypad

Keypad dimensions: 77*77mm

Length of cable: 84mm

8-pin 0.1″ pitch connector

Weight: 6.5g

Key Number
4 kyes 12 kyes 16 kyes 16 kyes 16 kyes

Pins
5 pins 7 pins 8 pins 8 pins 8 pins

Weight
3g 5g 6.5g 6.5g 6.5g

Cable length
87mm 85.5mm 84mm 84mm 84mm

Keypad dimension
69 x 20mm 77 x 69mm 77 x 77mm 77 x 77mm 77 x 77mm

Quantity
8pcs 8pcs 8pcs 6pcs 6pcs

★4×4 keypad is a great way to let users interact with your project. You can use them to navigate menus, enter passwords, and control games and robots.
★8 pins connector, pitch 2.54mm membrane switch keypad, Life span : average tactile time 1,000,000 ,Operation Temperature : 0-60°C
★The 4×4 matrix keypad usually is used as input in a project. It has 16 keys totally, which means the same input values. It’s ultra-thin, easy to interface with any microcontroller and has an adhesive backing for easy mounting.
★Application: Password security system,Wired remote controlled robot, Electronic voting machine, Generating external interrupt,Musical keypad and many more.
★Keypad dimensions: 77*77mm, Length of cable: 84mm. Weight: 6.5g, 8-pin 0.1″ pitch connector.