4 x 3 Matrix Array 12 Switch Keypad Keyboard Module 12 Key MCU Membrane Switch Keypad Compatible with Arduino
Details
- BrandHALJIA
- Compatible devicesAVR PIC
- Connectivity technologyUSB-A
- Keyboard descriptionMembrane
- Recommended uses for productEducation
- ColourMultiple
Description
🔧 Unlock your project’s potential with the ultimate keypad companion!
- ROBUST BUILD QUALITY - Durable plastic and metal ensure long-lasting reliability
- EFFORTLESS INTEGRATION - Plug-and-play module eliminates wiring hassle
- SPACE SAVING FORM FACTOR - Small 6.95 x 5.1 cm size fits tight project spaces
- COMPACT 4 X 3 MATRIX DESIGN - 12 keys including 0-9, * and # for versatile input
- UNIVERSAL MCU COMPATIBILITY - Seamlessly works with Arduino, AVR, PIC and more
The HALJIA 4x3 Matrix Array 12 Switch Keypad is a compact, durable input module featuring 12 keys (0-9, *, #) designed for seamless plug-and-play integration with Arduino and other microcontrollers. Its robust plastic and metal construction ensures reliability, while its small footprint makes it ideal for access control, safety devices, and custom electronics projects.
Specifications
| Brand | HALJIA |
| Product Dimensions | 6.95 x 5.1 x 1 cm; 10 g |
| Manufacturer reference | ADN2006037 |
| Manufacturer | HALJIA |
| Colour | Multiple colours: |
| Power Source | Corded Electric |
| Are Batteries Included | No |
| Item Weight | 10 g |
| Guaranteed software updates until | unknown |
Reviews
M**K
How strange that anyone can get these to work
These cannot possibly have worked for anyone.Mine didn't so I took it apart to investigate (don't thank me ... you're welcome)#1 The pins are not in a logical col 1 2 3 row 1, 2, 3, 4 order. Oh no.#2 Some tracks are incomplete and result in no connections! eg pin 6#3 Only 4 buttons had the necessary pair of connections (the 1, 2, 6 & *)#4 Even these failed to make a short when the button is pressed.#5 Resistance varied between 500 and 200 ohms, preventing software from recognising a key press.I give up. Just don't buy these. (Note the same item from Flux has the same issues)If you are real person who has successfully used one of these I'd be interested in how.
J**H
Wired up no problems
well made nothing to dislike
J**S
Poor design, but functional.
Schematic was incorrect (and non standard for these types of keypad) requiring some reverse engineering to get the pin out right, and "on" resistance was very high (~100s of ohms), but otherwise mechanically sound and worked as I needed.
J**S
Poor design, PCB doesnt reflect wiring diagram in image.
Also mentioned by others, the layout is not standard.C1,C2,C3R1,R2,R3,R4rather (looking at keypad side right to left:C1 = pin 3 ,C2 = pin1 ,C3 = pin5R1 = pin2 ,R2 = pin7 ,R3 = pin6 ,R4 = pin4
A**R
It doesn't work!
In line with another review by MikeK, there is no logic to the conections and not all of the buttons work at all.This is a very poor product which is simply not worth the bother!
Common Questions
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