Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [keyboard]

A Keyboard is an input device typically made of a large array of switches. The interface could be the raw matrix, or an industry standard protocol like PS/2 or USB.

A Keyboard is an input device typically made of a large membrane matrix of buttons.

These can be the raw membrane matrix to interface with a microcontroller, or have an industry standard protocol like ADB, RS232, PS/2 or USB.

Shapes and styles vary, as do keyboard layouts and extra options, like built-in media controls, USB hubs, lights, or even LCDs.

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Is there a way to add Bluetooth functionality to an ErgoDox EZ keyboard?

It would be nice to have some sort of mini-USB accessory that could bluetooth-enable an ErgodoxEZ keyboard. I found some related discussion here: https://www.reddit.com/r/ergodox/comments/8kugs5/is_it_possible_to_add_bluetooth_functionality_to/, but…
Troy
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How would I use this 12 key keyboard?

I'm trying to make this simple code lock circuit, and I ordered this keyboard for it. However, there isn't any kind of manual for it, and I simply don't understand how it works. Here's a larger picture of it (sorry for the horrible soldering, I've…
user32949
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Keyboard fixing

I have near 5 keyboards broken because poured water or juice, etc... Most problems are keys that don't work or swapped keys. I want to know (just for electronics exercise - I know that keyboards are cheap) if it can be fixed or tested with basic…
Click Ok
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Problem with too-high logic level / floating signal in 15 x 5 keyboard matrix

I'm pretty rusty with electronics, so please forgive me this question. I've built a keyboard matrix with 15 columns and 5 rows. The 5 rows are connected to GPIO pins on an Atmega 32u4 MCU. The 15 columns are connected to GPIO pins on an MCP23017 I/O…
Wez Furlong
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How does this N-key-rollover work?

I'm designing a keyboard. I found some information online about how to make the keyboard be able to detect multiple key presses at the same time (N-key-rollover). I found this schematic, from this website. The website says that A and B are the two…
Jacob Garby
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What is this keyboard connector and how to connect it to MCU?

I have a 1991 laptop keyboard w/o the motherboard. It was attached to the main board with two flexible cables. The keyboard feels awesome and I would like to make use of it. The issue is that I can't identify what connector this is (see pic.…
JSmyth
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What signals does the flat cable send in laptops?

Can the flat cable through which the internal keyboard in the laptop is connected transmit PS/2 or USB signals? Or does it send some other signals like serial or parallel, which are then converted on the motherboard to PS/2 or USB signals using a…
another.unix.hacker
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Will a Casio keyboard work with a lower current adapter?

My electronic keyboard uses a 12V 2 ampere adapter. Will it work with a 1 ampere adapter?
Dj Mixer
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Keyboard column not responding

Have a keyboard with hotswap sockets that was previously working... suddenly one column no longer works. Specifically the column consisting of 6yhn does not work anymore. Here is a link to the schematic…
hwrd
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Connecting a keyboard PCB to wires without soldering

I have a PCB from inside a Dell keyboard that I took apart. I would like to be able to affix wires to the edge card connector, without needing to solder anything. I don't want to solder anything, because when I need to take it apart (which I will),…
Rowan Ackerman
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Is it possible to use a membrane keyboard chip in another membrane keyboard?

I have a membrane keyboard that has stopped working. I would like to fix it using the chip of another older keyboard. Is it possible?
Lucas Rock
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usb keyboard with many simultaneous key presses

I am looking to make a keyboard that allows for 2 or so keys pressed at the same time by the same finger. ie s and w would both register and a total of 8-10 keys registered at 1 time. the keyboard matrixes dont really allow for such. As such I…
Kendrick
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Spilling water to keyboard fixes keyboard weird

I have a laptop of about 5-6 years old. (A) key hasn't working properly for a while. But I spilled water on down arrow key and weirdly (A) key started working. How is this possible?
IWantJustBasicCollisions
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How to connect rows and columns in a keyboard matrix

I want to build a keyboard from scratch, so I started by designing the schematics. I have found several ones on the web in which the switch - diode direction is connected from row to column, and other in which the switch - diode direction is…
user3060854
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Building a keyboard matrix

I want to build a 7 Rows x 15 Columns keyboard from scratch, thus I have started from the theoretical design of the matrix. The classic way should be to assign directly the Rows and Columns to (7+15) I/O of a microcontroller and also connect 7X15…
user3060854
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