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.
229 questions
1 vote
1 answer
104 views
Unsure If there is any oversight on my reversible split keyboard PCB
I am currently designing a reversible PCB for a split keyboard and wanted a peer review for the schematic before I spend hours routing traces. The goal is to have the two rp2040's communicate over ...
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3 votes
2 answers
677 views
I'm new to PCB design, please help me check if my board looks correct before I order it
This is my first time posting and I'm new to making a PCBs. I want to make sure that it'll work. I'm designing a keyboard and don't want to waste my money on a bad board. It's a 2-layer PCB The ...
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-1 votes
1 answer
167 views
Elite C microcontrollers not getting power
I have a corne keyboard I made that has been working without issue for 2 years. This week both failed, they no longer get power (no led on either). This started with the first 3 keys on the far left ...
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0 votes
0 answers
100 views
Hoping to get some help identifying what I think is an inductor
I was trying to plug in the daughterboard connector (USB-c power and signal board) on a GMMK keyboard (100%) and ended up ripping this inductor (I think it's an inductor) off. PCB missing inductor: ...
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1 vote
1 answer
139 views
Need clarification about CC lines on the USB-C port of a laptop
Let's consider a laptop with a USB-C port that allows both charging and connecting peripherals. Now, let's say I connect a USB-C keyboard to this port. From what I understand, the configuration is as ...
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2 votes
1 answer
764 views
How to design split keyboard with USB-C serial interconnect
I'm designing a split keyboard using atmega32u4 (without Pro Micro). Planning to connect the halves via USB-C to USB-C for serial Wiring. QMK docs state serial connection needs GND, VCC, and D2. Would ...
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1 vote
1 answer
101 views
Why does this design put capacitors on each pin of this connector?
This is part of the schematic of the Roland A49 MIDI controller: This is the connector that makes the connection between the keyboard and the main board. PR0-7 and SC0-7 are scan signals, the program ...
0 votes
1 answer
96 views
Smallest power supply for STM32F103? [closed]
I'm using the STM32F103C (LQFP48 package) with a custom keyboard PCB running QMK, powered by the AMS1117-3.3, and it works very well. I measured current consumption using something like this which I ...
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2 votes
2 answers
683 views
Replacing USB-C socket on a keyboard
I decided to fix some of my stuff that has broken USB-C ports. (why are they so fragile!) I've removed the old sockets and cleaned the pads, but when the old sockets were damaged (by simply inserting ...
0 votes
1 answer
107 views
USB cables being affected by manufacturing equipment [closed]
I am an IT guy, who enjoys learning about some of the electrical engineering side of things, but I don't have a good grasp of the jargon. We have a client with about 40 different smaller production ...
1 vote
1 answer
61 views
How to find the matrix layout of an old EEPC keyboard
The title asks my question; how can I find the matrix layout of an old EEPC keyboard. I found an instructables about making a USB keyboard controller but it uses a Teensy microcontroller, and I think ...
0 votes
0 answers
66 views
How to short time delay controller?
I have an old keyboard which I use for decorative purpose. It has RGB lights which turns on for few seconds when a key is pressed. I want to keep them on at all times. How to achieve this? Can I ...
1 vote
0 answers
60 views
RKJXT1F42001 Logic diagram
I'm looking into integrating an RKJXT1F42001 4-directional stick switch with encoder and center push function into a keyboard I am designing, but a little confused about the diagram. I want to make ...
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1 vote
0 answers
18 views
Multiple Qi transmitter/receiver pairs powering one device
*disclaimer: I'm just a tinkerer and this is more of a hypothetical thought exercise than anything. I'm planning on adding a usb-c Qi receiver to my keyboard, and I was wondering if it would be ...
2 votes
2 answers
769 views
Home made USB 2.0 device switcher (for mouse/keyboard only)
I did buy some off the shelf ones, but they seem to fail after a few months and or screwing up the USB ports. I opened the switch box up and noticed that the two power lines were always connected to ...
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