A Keyboard is a 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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10 views

DIN 5 keyboard to USB? [migrated]

I have an old keyboard with a DIN 5 connector, I noticed that the wiring on a DIN 5 connector is basically identical to the USB based 4 contact wiring. Can I just blindly wire a DIN 5 ( starting from ...
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0answers
20 views

Help identifying FFC Apple rMPB keyboard connector

I'm working on hacking a Retina MacBookPro (2013) keyboard for use with Arduino. The keyboard has a 30pin FFC (or is it FPC?) connector interface. I'm looking for any kind of connector that would ...
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1answer
55 views

What capacity LiPO battery is equivalent to 5 AA batteries?

I have a Casio MA-120 keyboard (musical). Which requires 5 AA batteries. On back of the keyboard there are power source instructions which says: ...
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0answers
22 views

Long range wireless keyboard / numpad (remote control a computer from a 20-30 meter distance) [migrated]

In order to illustrate my challenge, I'll explain what I'm trying to achieve. I'm training a young talent in tennis, and she's a real darling. I'm trying my develope the best environment for her to ...
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0answers
20 views

Socket for Thinkpad R50p keyboard connector

I want to use my old Thinkpads' keyboard but cant find a fitting socket for the connector. Is there a way to identify the socket type or manufacturer so I can find it on the (German) market? ...
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1answer
84 views

Bluetooth keyboard?

Can the Bluetooth board "XS3868" be used for in a Bluetooth keyboard for a computer? Without using an Arduino
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1answer
178 views

keyboard and mouse interface

How do I interface a microcontroller with PC USB so that I can imitate the keystrokes and movement of keyboard and mouse. I've heard of software fixes, but is there any IC which can mimic the ...
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0answers
34 views

Reading an irregularly shaped matrix and doing action when a key is pressed in a modular way

Before I get into the details, I'd like to apologize if this is the wrong SE site for this. I could see it going on here, Stackoverflow, Arduino, or maybe even code review. I am using a Teensy 2 as a ...
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3answers
141 views

Securing a pcb to be used in a keyboard to its case

I'm looking for a way to secure a pcb I will be making for a cherry mx (homemade) keyboard to a case which I'll also be making. Obviously, I don't want the pcb to move. I could use standoffs/screws, ...
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1answer
117 views

Monitoring USB Keyboard Input with Microcontroller

I am currently working on a project in which I would like to be able intercept a specific key combination from a standard USB HID keyboard with a microcontroller. The purpose is to use the keyboard to ...
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3answers
860 views

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 ...
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3answers
165 views

Just making sure I won't fry my motherboard?

I'm building this circuit, which converts a toggle switch to a momentary one, which sends a key to a USB keyboard PCB by connecting 2 contacts together: I just wanted to check, how do I know the ...
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0answers
110 views

Set/Reset Keyboard LED command 0EDh is not acknowledged by my keyboard, why?

I am sending commands to PS/2 keyboard using my 8051 development board (using AT89C51 MCU). The subroutine which I wrote to talk to the keyboard is working fine when I issue commands like ...
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1answer
443 views

How to wire/interface a 4x3 membrane keypad

I followed this example to wire my keypad to my STM32F4 Discovery board. However any way I read data on the pins I keep getting same data which leads me to believe I wired something wrong. Here is ...
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1answer
884 views

Is it possible to use msp430 with keyboard + LCD?

I'm trying to do an assignment for my class which requires me to use a keyboard as input through a microcontroller to a LCD screen, nothing fancy , I just need to show that when I press characters on ...
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1answer
65 views

Arduino data processing [closed]

I am currently looking into using the Arduino micro controller for data processing. I thought a good way for me to get practical experience and learn is make a sample application like a key logger - ...
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1answer
162 views

How to create traces that don't touch for a four by four non matrix keyboard grid

Hello. I have a potential design for a keyboard whose pcb I will make myself in eagle. This will use cherry mx browns (http://www.cherrycorp.com/english/switches/key/mx.htm for info. Rather than ...
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2answers
325 views

Illuminate keyboard using Scroll Lock key

I have a keyboard that I'd like to illuminate when pressing the Scroll Lock key, but I'm not really good when it comes to designing something like that. I'm planning to use a transistor that will ...
2
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2answers
186 views

connect LEDs to USB keyboard – but they turn off after a second

I have a USB keyboard. As I work many times in the darkness, I put some LEDs into the keyboard case. I connected two pairs of yellow standard LEDs serially to the USB power lines (Vcc and ground, pin ...
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2answers
578 views

How to go about making a keyboard with arduino as the controller [closed]

These are questions I have found that are similar to mine: Arduino as full fledged keyboard controller? This is somewhat similar but it sounds like op is trying to connect an existing keyboard How ...
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1answer
53 views

A strange keybord input-output problem [closed]

I wanted to ask about a problem that have with my keyboard. Can you infer/explain what could have happened to it and how to fix that from keybords current behvior: some of the keys are outputing to ...
2
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2answers
392 views

Building a wireless keyboard (preferably with a kit)

This is the project that spawned these earlier questions. I'd like to create my own keyboard. Functionally it's going to be a keyboard, but visually it's going to bear more semblance to a joystick ...
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1answer
139 views

Electrical properties of keyboard keys

I'm looking to hack together a keyboard by taking an existing keyboard and connecting it to switches that I'll assemble separately. What I want to know: What should be the electrical properties of ...
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2answers
709 views

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 ...
3
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1answer
116 views

Tuning an electric organ keyboard

I have an old (1960's) Whippany Dart combo organ. Each set of three keys has a tuning pot that raises and lowers the pitch of those three notes (turning clockwise lowers the pitch, and ...
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4answers
1k views

How to find socket for keyboard connector?

I am looking for a socket which is able to receive the connector of the ThinkPad X41's keyboard. How do I identify the socket so that I can find it on the (German) market? Background: I want to build ...
2
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1answer
808 views

Arduino as full fledged keyboard controller?

I am considering connecting a ThinkPad X4x keyboard to a PC, using a programmable KeyWarrior keyboard controller in between the keyboard's ribbon cable and the USB cable to connect it to the PC. Not ...
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1answer
133 views

How Can I Program a Universal Application Keyboard? [closed]

IMPORTANT NOTE: This is a question from who has no experience and knowledge on this area. So before giving negative rep, please provide constructive suggestion. I want to program a universal ...
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3answers
402 views

How does the ZX80 keyboard avoid ghosting and masking?

I believe that a keyboard matrix needs a diode on each key to avoid ghosting and masking. http://pcbheaven.com/wikipages/How_Key_Matrices_Works/ The ZX80 (and probably ZX81) has only a diode for ...
3
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1answer
683 views

using the PS2 keyboard library with Arduino Leonardo

I'm having difficulties getting the PJRC PS2 keyboard library working reliably with the Arduino Leonardo. I'm relatively new to using the Arduino, but this library seems to be the recommended way to ...
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1answer
341 views

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 ...
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2answers
1k views

Creating a keyboard with a microcontroller, do I need an input pin for each key?

I am planning to implement V-USB with an ATMega8 microcontroller. I am interested in implementing an HID device; more specifically, I want to try and make my own simple 26 key keyboard (each ...
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4answers
11k views

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 ...
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0answers
212 views

Using a Keyboard in a 556 Stepped Tone Generator

I'm in the process of making a simple stepped tone generator using the 556 timer, but I want to be able to have different resistors to change the pitch of the tone I get out. I think it would be ...
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1answer
111 views

Keyboard and mouse chips to buy

i need to buy a keyboard and mouse chips(every thing in mouse and keyboard not made of plastic ) and i want to know what`s the prices of each and how to buy it and thnx in advance.
2
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1answer
176 views

How do you make the LEDs come on for a PS/2 keyboard?

I'm making a simple console type thing for the mbed with a PS/2 keyboard and VGA monitor. I have a PS/2 library working and can receive scancodes and such. I want to go above and beyond what it allows ...
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5answers
509 views

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 ...
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6answers
534 views

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 ...
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1answer
219 views

Keyboard USB cable reconnnection

I've just tried to repair my keyboard's usb cable as it has been damaged right where it goes into the keyboard. I've cut out the bad part of the cable and reconnected the wires. I've tried it and all ...
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1answer
257 views

How do you output a frequency/note with a 1V octave keyboard controller?

To be specific, I made this: from here And to test the CV output, I used this schematic: from here It works as a oscillator. Every time I hit a key it will oscillate at that note, but it wont ...
3
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1answer
1k views

Teensy usb keyboard + Android

I've just gotten one of these Teensy boards: http://www.pjrc.com/store/teensy_pins.html I am trying to set it up using the basic keyboards tutorial. It is working correctly on Windows PC devices when ...
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1answer
462 views

Arduino Power On notebook PC

Is it possible to "Power On" notebook PC with Arduino (or with USB keyboard) without pressing notebooks power button ? Notebook PC is Acer 5720Z.
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2answers
2k views

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 ...
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3answers
3k views

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 ...
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2answers
2k views

Is there an easy way to test if my PS/2 -> USB adapter is passive?

I own a couple of PS/2 to USB adaptor/converter connectors that look like the following: Is there anyway to test if these adapters are passive without disassembling them (or risking damage by ...
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4answers
4k views

How to build a custom laptop computer with original chassis, keyboard, etc? [closed]

I'm interested in building a custom laptop computer with the hope of being able to sell it and make a profit. The only problem is I have no idea where to start. I have an idea for a laptop chassis ...
2
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2answers
702 views

'keyboard from scratch' registering key presses

For my first hardware hack I'm taking a stab at a 'mechanical keyboard from scratch' (where scratch means individual components). I plan to use a teensy++ board (16MHz) and was wondering about how to ...
4
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1answer
385 views

what sensors to use in touch sensitive furniture

I'm trying to make a wooden table with a touch-sensitive top, made up of a mosaic of small wooden pieces resembling scrabble playing pieces separated by thin glass separations. each wooden piece would ...
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4answers
397 views

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 ...
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2answers
817 views

Adaptor to use old AT&T / keytronic keyboard with DB9 connector?

I have an old keyboard (circa 1998) with a male DB9, and I'd like to use it on a modern PC with a female PS/2. The keyboard is AT&T branded, Comcode #405748401, FCC ID CIG8AVE03417 Keytronic ...