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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How to find socket for ThinkPad keyboard ribbon cable connector?

I am looking for a socket which is able to receive the connector of the ThinkPad X41's keyboard ribbon cable. How do I identify the socket so that I can find it on the (German) market? Background: I want to build a custom keyboard controller, to…
feklee
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Arduino PS/2 Keyboard Emulator Issues

Yes, I've searched the Arduino.cc forums and here.  Yes, I've found the articles regarding the ps2dev library.  Yes, I've read (okay, some I skimmed) the definitive PS/2 interface article at this website. Yes, I have this working, kinda.  I need…
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What linear sensor for a keyboard?

I'm trying to make a velocity-sensitive keyboard for playing music. I have to measure the position of each key in order to know how loud the sound should be. The volume of the sound is a function of the velocity of the keys at the end of the…
Jonas Daverio
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How to have custom keyboard scancode set

I'm new to the hardware field in general. For one project I'm trying to create a custom keyboard that will have some extra keys, say 20-25 more than a standard keyboard. I've read about scan codes and scan code sets. I've also read about keyboard…
Vivek
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Can I get the chip or electronic kit of a USB keyboard alone whithout the plastic case?

first of all, understand that I have a very basic knowledge of electronics. I have a Commodore 64 case and I want to turn it into a USB keyboard. My approach would be taking a keyboard appart and getting its internal electronics and soldering its…
Petruza
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A good circuit for a large number of push button inputs?

I'm planning to build a kid-friendly "universal remote" so the kids can turn on and off a myriad of IR-controlled devices with one or two easy presses... The remote is going to have maybe 20 big chunky buttons which, when pressed, with send the…
Brad
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Cheapest, simplest way to implement a Bluetooth keyboard/mouse?

Thinking of building a device for sending text and probably mouse movement into a computer, but I want it to be wireless and compatible with many computers/PDAs/phones without a specialized dongle, etc. So I thought "Hey, Bluetooth is a standard…
endolith
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How to make an USB keyboard work with Bluetooth instead?

I have an USB keyboard (HHKB) which has some great irreplaceable features(That's why I would not like to buy a Bluetooth keyboard directly) and I love to use it very much. But the only improvement I expect is to avoid its USB wire. I would like to…
Timothy
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Apple Desktop Bus (ADB) to USB Adapter

I have an old Apple keyboard that I would like to use but it uses the ADB bus instead of the newer USB bus. Griffin used to produce a product called the iMate which was an ADB-to-USB converter but have since discontinued it. So I've decided to build…
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How to uniquely identify USB HID class device?

I would like to identify a USB keyboard uniquely(something equivalent to unique mac-id for the Ethernet cards) on a computer. Does the USB HID profile has a support for such identification ? If so what is the field called ? I understand that VID and…
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How to make your own ps/2 to usb convertor for old keyboards

I am quite aware you can get ready made off the shelf adaptors to connect old ps/2 keyboards to USB. But I am curious as how would one do it themselves? I have tried just rewiring an old keyboard to a USB cable as they both have 5V and ground and 2…
crowie
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Interface 5v digital pulses to keyboard contacts?

I currently have the following bit of kit: Photoplethysmographic sensor for measuring heart rate It outputs a 5v pulse each time your heart pulses. What I need is to do is interface this pulse output to a keyboard (So each time your heart pulses a…
Scott
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Need a device that can take single input and covert to a keyboard key press on USB

Let me explain what I'm doing currently. We have made a finger heart rate monitor, each time your heart pulses a transistor is switched on via its base. The collector and emitter of the transistor are then wired to a dismantled USB keyboard. The…
Scott
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Old Hall-Effect Keyswitches?

I have a keyboard from an old Silent 700 TTY that I'm trying to bring to life. The problem is that each individual keyswitch appears to be a hall effect sensor. There are no part numbers; the chip dies are individually bonded to the carrier…
phooky
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Recreating a missing wireless keyboard dongle with NRF24L01

I have found an old Logitech Wireless Keyboard (specifically, the MK250 model), which was originally sold with a separated "standard" 2.4Ghz receiver dongle (Not 'Unifying', as written here). I assume that the keyboard itself has a corresponding…
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