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4x4 Universial 16 Key Switch Keypad Keyboard For Arduino

4.5 out of 5 stars 91 customer reviews
| 4 answered questions

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  • 8P DuPont head, pitch 2.54mm, can be inserted in the Pin connection circuit; Peel off the white sticker on the back of the keyboard can be securely affixed to the surface of the chassis
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  • 4x4 Universial 16 Key Switch Keypad Keyboard For Arduino
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Technical Details


Product Description

8P DuPont head, pitch 2.54mm, can be inserted in the Pin connection circuit; Peel off the white sticker on the back of the keyboard can be securely affixed to the surface of the chassis

Product Information

Product Dimensions 6.2 x 3.5 x 0.4 inches
Item Weight 0.5 ounces
Shipping Weight 0.5 ounces (View shipping rates and policies)
ASIN B008A30NW4
Item model number 10
Customer Reviews
4.5 out of 5 stars 91 customer reviews

4.5 out of 5 stars
Best Sellers Rank #28 in Industrial & Scientific > Commercial Door Products > Commercial Access Control > Door Control > Access-Control Keypads
#263 in Electronics > Security & Surveillance > Accessories
Date first available at Amazon.com June 9, 2012

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Customer Reviews

Top Customer Reviews

By Rogers on January 22, 2013
Verified Purchase
It does what is says it should do. That being said, I really don't like the idea that 8 of my 20 I/O ports are being used simply to run a keypad. I created a resistor array to pair up to the keypad and convert the key presses into a single channel varied resistance response. Now I can use the keypad using only 1 analog channel instead of 8 I/O. It took some time to figure out what resistor values would give me enough space between response values but in the end and about $0.50 worth of resistors I am much happier with this keypad.
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The pad is very thin, and comes with no pinout/documentation, although for less than $4 what can you ask for. Pressing a button activates two pins: the row and the column of the button pressed. After some experimentation I found that the pinout is (from left to right) R1 R2 R3 R4 C1 C2 C3 C4, where R and C are row and column, and 1,2,3,4 are top down for rows, and left to right for columns. All eight pins can be connected directly to digital (no 5V or GND needed), or if you really want to save space you can buy some 7400 series encoders to cut it down to 4 pins.
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By K. on January 3, 2014
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It's a 4x4 membrane keypad, and it does that well.

it doesn't come with any kind of pinout so it will require some googling and some multimeter testing to get the row and column pins identified.

Incidentally, the first four pins are the rows and the last for pins are the columns.

I wish it would have come with a female to male adapter so that I could plug it directly into a breadboard without a whole nest of jumper cables.

Also, keypads are more complicated than I realized so if I was an Arduino neophyte (I am), I'd buy some momentary switches instead.
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This is a great little keypad for the money. Excellent for experimentation. Here is a link to a pin out drawing I did for this unit (since there isn't one referenced in the description). I hope that helps!

[...]
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This keypad is supported by some of the standard Arduino libraries and works well. The only shortcoming is it is very thin and flexible. The back is covered in a double face tape material so I am assuming it is designed to be stuck to a rigid flat surface for proper operation.

It measures 2 1/4" wide by 3 1/16" tall and the 7/8" wide cable is attached to the back center bottom. If mounted to a rigid surface with a small slot cut in it the cable would not even be visible.
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This simple membrane switch is straightforward and just one of the best prototyping pieces I have. Inexpensive to start with, it comes with an adhesive backing which I used for mounting it to the front of my electronics project, being a pattern matching system for a game. As I expand the design, I'll need another, but will certainly not hesitate to buy another when the time comes.

It loses one star for lacking E and F, which would allow it to be used for hexadecimal entry, Also, there is a minor glitch in the adhesive that apparently created a wrinkle under the front label, but as I'm not the type to complain heavily about minor esthetics, I didn't dock another star. In addition, the lack of a data sheet meant a lot of tinkering as I learned which wires were which, and that took me over a week to figure out, since the ground placement didn't really make sense to me.

Even so, in spite of the few issues, it works well, and it's tough enough to stand up to the rough treatment my children can dish out.
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There's not much to say about this. It's a little pricey for such a simple part but I needed a keypad and at the add-on price it cost about as much as shipping from anywhere else, so I went for it. It's a well-made little "squishy" keypad, very easy for someone with basic programming knowledge to quickly integrate into their project. There's no documentation included but you can see the traces through the back and it's pretty easy to figure out.
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NOT immediately compatible with arudino, and takes quite a bit of extra wiring, as would any other random device. so the advertising to be compatible with arduino is like saying this hard drive is compatible with a mac (but the hard drive doesn't fit into your mac computer and you have do a bunch of extra stuff to get it connected. and its about as cheaply made as a anything Ive ever owned, ever. get what yah pay for i guess!
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