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.

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Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized."

I tried sourcing all the parts for this keyboard. I soldered everything up and when I plug in the keyboard I immediately get an error message "USB device not recognized": My first though ...
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Will a Casio keyboard work with a lower current adapter? [duplicate]

My electronic keyboard uses a 12V 2 ampere adapter. Will it work with a 1 ampere adapter?
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STM32 USB HID Keyboard skipping key presses

I have an STM32F3DISCOVERY evaluation board which has an stm32f3 mcu on it. I am trying to use the board to emulate a USB keyboard. I used the STM32CubeIDE to enable USB communication, configure the ...
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Keyboard Repair: Both Shift Keys Dead [closed]

I have an old notebook working perfectly fine. The only issue is that both shift keys are completely dead: keyboard top view keyboard bottom view ...
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Can a PS/2 keyboard be converted to USB hot swap (plug)? [closed]

I have an old keyboard made in 1998, and I want to use it, but my computer does not have a PS/2 port. I bought an adapter to convert the PS/2 of the keyboard to USB. I know PS/2 cannot hot swap. But ...
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Replacing a keypad on DYMO LetraTag

I'm rebuilding my label printer to become an Internet service using an ESP8266. It's a fun project, never mind the usefulness. The keypad will be removed and instead my MCU emulates keypresses. The ...
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Could anybody help identify this connector?

Would any of you recognize the following connector ? It's on a old Dell laptop motherboard (M3800). It's to connect the led circuit from the lit keyboard. The flat brown cable from the lit keyboard ...
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Purpose of PNP transistors connected base to base in 1V/Octave synthesizer keyboard circuit

The circuit below (found here) is designed to be used in a 1V/octave keyboard used to control a synthesizer. When the potentiometer is adjusted properly, pressing the buttons produces output voltages ...
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What can this pin on my keyboard connector be?

I'm trying to place a USB-C connector on my keyboard so I can use a removable cable with it. It's a Ozone Strike Pro with audio and USB pass through. I managed to map 10 of the pins with a multimeter ...
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STM32 matrix keyboard scanning gets random keypresses

I am trying to implement a keyboard with STM32 controller (since I managed to burn all my ATMegas and STM32 was all I have). It uses two matrices of keys (it was supposed to be a split keyboard, but ...
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Teensy++ 2.0 doesn't jump into bootloader using software

I have a Teensy++ 2.0 with 90USB1286 CPU running QMK. I'm trying to make it jump into the bootloader using the QMK software. I tried two approaches: Mapping a RESET...
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What is the difference between making a resistor based keypad and not using a resistor on arduino? [closed]

I've seen videos on youtube about how to emulate a keypad on arduino. Some of them includes a resistor while others do not. What are the difference between them and are there advantages in doing one ...
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How can this 74 series Inverter circuit be analyzed?

I'm trying to analyze the keymech scanning / sampling circuit in the WASP synthesizer So far I understand that the keymech is sampled one key at a time by the 74 series logic driven by the dual ...
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How to communicate when a packet starts and ends (send two bytes in one packet)

I am aware that there are some libraries around this topic and that it would be easy to make this type of keyboard if I'll use different kind of arduino. I am doing it for learning purposes and couldn'...
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2 votes
1 answer
126 views

Unusual USB keyboard wiring - repair needed

New to anything electrical, and I'm trying to make an urgent fix for my wife's keyboard. She has a disability, so needs a specific keyboard to work, and the USB plug on the keyboard has been damaged ...
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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 ...
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Decoding and connetting a keyboard PCB [closed]

I want to build a laptop from a raspberry-pi and an old "toy laptop" (and new components), the spare toy laptop I have is a Oregon Scientific Batman BL31T. I would like to use its case and ...
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Not detecting closed circuit in Goldtouch keyboard key presses

Context While converting the Goldtouch Go!2 Mobile keyboard from Bluetooth to micro USB, I'm experiencing some difficulties in registering the keystroke signals coming out of the FPC connector. Setup ...
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How to add many I/O lines to a microcontroller for my custom computer keyboard?

I think that this is a design question because I need to know what type of chip to use first, and then I'll go shopping on my own for which one to use. I need to understand how to add at least 90 ...
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When to switch to 4 layer PCB

I'm currently designing my own 60% per-key RGB mechanical keyboard. (60% means the keyboard only contains 60% of the keys of a regular keyboard.) I've laid out the components, routed the switch scan ...
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3 answers
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How to connect membrane tracks on a keyboard? Problem on photo

How to connect membrane tracks on a keyboard?
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What do I find material to understand which electronic components are needed for a microcontroller?

I'm interested in designing a PCB for a keyboard, and I can't seem to find materials on learning what components are needed for the board (resistors, capacitors, diodes etc). I understand basic ...
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Circuit paths on a plastic sheet of a Model M keyoard are dark brown and don't forward electric signals any more. Are they corroded?

I'm trying to repair a 2015-issue Model M keyoard whose couple of keys don't emit any scancodes any more. After I have excluded some obvious culprits (stuck keys or springs, debris etc.) and ...
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Unable to correctly send keypresses using the LUFA library

I'm making a board with an atmega32u4 on it for the controller for a keyboard, and am having issues with telling the host computer that a key is pressed. I've modified the Keyboard demo supplied with ...
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3 answers
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PS/2 keyboard with RS232 (DB9) workstation port

I'm currently awaiting for dispatch/delivery of a 1995 PS/2 Model M keyboard w/attached flat cable but a missing PS/2 plug It seems those flat cables were not very sturdy. (Yes, I checked the model ...
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Is there a fake way to drive a matrix keyboard (to use a typewriter as line-printer)

I recently found a Brother AX-425 typewriter, I want to be able to control it via a computer. Its internal electronic seems pretty simple, it's a 8*8 matrix ...
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How to detect pinout of trackpoint (probably ps/2) module?

I have following trackpoint module of recent thinkpad x390. There are some info about older modules, most useful(combined) one is: https://deskthority.net/wiki/TrackPoint_Hardware However, i found no ...
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What ASIC/MCU is in my keyboard?

I disassembled my unbranded USB keyboard to find out what ASIC/encoder/MCU is inside. The chip is (as expected) covered, like the following example: How to find out which chip is underneath?
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PC recognizes keyboard pcb only as FT232R usb UART but doesnt see atmega32a behind it

I made my own pcb design for mechanical keyboard. When I wanted to test it, both mac and windows system recognize only FTDI ft232rl chip on pcb but not atmega32a behind it that controls whole keyboard....
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Keyboard USB transform

I want to press a key on my keyboard, for example "a" and a device should take the scan code of the button I pressed and transform it to something else: e.g. "b" or the scan code ...
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How to attach wires on a keyboard controller PCB

I want to make a module with 3 momentary buttons that will be record the numbers of pushes on a pc. For this first i though about using an arduino but also I am trying to use a keyboard motherboard/ ...
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Daisy Chain USB Devices with USB2422

I'm designing a keyboard and I want to be able to daisy chain another USB device through it. I have a Drop ALT that does this and I really like it. It has two USB C ports and you can connect either ...
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What is the name of the translucent substance on the PCB?

PCB on photo is from the Kinesis Advantage keyboard. I need a similar substance to remount the PCB. What substance should I use?
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How to repair accidentally removed solder pad?

Disclaimer: Pardon my lack of knowledge on the following So while I was trying to de-solder a keyboard switch I accidentally removed the solder pad (top arrow) and not only that lost it as well in the ...
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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, ...
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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?
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Reprogramming MCU Flash Memory I/O placed on a PCB of a mechanical keyboard

I've decided to modify some things about my mechanical keyboard (Hermes M1), so I tough starting with installing the software driver it's a good idea. Thus I've changed some things about lighting of ...
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Looking for a way to connect wires to a breakout board without soldering

I'm looking to get a custom keyboard cable but there's a catch - my keyboard cable is currently hardwired. The solutions I've come up with are either to use a janky solution where I use solder splices ...
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What can I submerge my keyboard circuit board in that would remove the corrosion from it?

The contacts are between two thin plastic(?). In order to expose the print, I'd have to peel them apart. That's a lot of work since I'd have to perfectly align them to put them back together. What can ...
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What is this black tape on my laptop's keyboard?

I am trying to replace the keyboard on my 2019 Samsung Notebook 9 Pro. I had to pull off a layer of black tape on the old one to get it out. The tape was glued to the bottom of the keyboard, right ...
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5v analog switch for 3.3v logic ok?

I have a project where I want to interface with a keyboard matrix / scanner (this is a PCB from a consumer electronics device). There's already an implementation that uses some analog muxes for this, ...
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Any teardowns of a usb type a male to type c female adapter? [closed]

I'm trying to make my keyboard cable detachable and USB type C, need to know how the wires in a type a male to type c female adapter would look (one with a short wire in between and not just a board).
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How do I make a keyboard cable detachable with a USB C female port?

Alright so I'm new to all of this but I've been modding my keyboard recently and would like to get a custom cable for it. I saw this video on how to do this with a USB micro connector, however I know ...
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Can someone ID this pcb for me? I got it from a salvaged keyboard

I salvaged a pcb from a keyboard and I need help finding a datasheet/pinout. can someone help?
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1 vote
1 answer
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Can I convert my old Digital MIDI Keybaord Casio CTK 3000 into a MIDI device, which gives only midi output

Recently my midi keyboard was damaged and it is not powering on, But now I realize I don't really need many features including speakers of the keyboard. So I thought I can convert into a small ...
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How to rotate a part/device in Eagle (schematic view) using keyboard-hotkeys only?

I'm fairly new to eagle. So far i was unable to figure out how to rotate a selected part in the schematic editor using keyboard shortcuts only. Please, do not answer with suggestions by using the ...
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Is it possible to make a keyboard with "Game Controller" style printed circuit boards and buttons?

For a long time I've wondered if it's possible to make a keyboard with PCBs similar to the ones used in NES controllers or just video game controllers in general. If it can be done with keyboards it'd ...
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1 vote
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635 views

Need help understanding a rotary encoder datasheet

I am trying to design a keyboard and have come across the realization that the datasheet for my rotary encoder asks for 5k resistors connected to terminals A and B of the encoder. However I am having ...
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First time making a circuit schematic/pcb. Need feedback :D

I'm making a custom mechanical keyboard and was following this tutorial. This is my first time making a circuit/PCB so I am kind of lost as to if I'm doing things correctly. I have watched and read a ...
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Spilling water to keyboard fixes keyboard weird [closed]

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?
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