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Forum Index : Microcontroller and PC projects : Keyboardemulator
| Author | Message | ||||
| Frank N. Furter Guru  Joined: 28/05/2012 Location: GermanyPosts: 813 |
I've built a little circuit for my Raspberry Pi projekt. It uses a normal keyboard-chip HT82K629A from Farnell for 1,77 € and you can emulate any button of a normal keyboard. I use it for joystick and buttons in my projekt above... 
You can plug any push-button on the matrix to generate any key and it works very fine! It works with any PC, Rasperry Pi AND WITH THE MAXIMITE with an PS/2-adaptor. If anybody is interested on it, I can send the PCB data or I can maybe convert my fileformat to Eagle... Frank |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9060 |
Excellent. I used to hack keyboards whenever I needed to do something like this, but this would definitely be the way to do it. I actually have about 10 of those KB chips, but my first attempt to get it working failed, so I never went back to them. Can you post the PCB files here as a ZIP perhaps? Smoke makes things work. When the smoke gets out, it stops! |
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CircuitGizmos Guru Joined: 08/09/2011 Location: United StatesPosts: 1421 |
Too bad that board doesn't have a PS/2 jack. Micromites and Maximites! - Beginning Maximite |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9060 |
He says it is compatible with PS/2, so you could always plonk a PS/2 to USB adaptor on the end of a standard USB cable.... Smoke makes things work. When the smoke gets out, it stops! |
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| CircuitGizmos Guru Joined: 08/09/2011 Location: United StatesPosts: 1421 |
Yes I read that, too. Micromites and Maximites! - Beginning Maximite |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 813 |
Hi Grogster, which PCB format did you prefer? Gerber? There is a little mistake in my actual design (C18 is mixed with C19). I can post it in a few days... There are different datasheets on the web. I merged the relevant things from the datasheets in one design... @CircuitGizmos: Grogster is right! I tried my circuit with a Duinomite and a PS/2 to USB adaptor - it works very well! You can wire a PS/2 cable direct on the PCB instead of the USB jack... Frank |
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psergiu Regular Member  Joined: 09/02/2013 Location: United StatesPosts: 83 |
According to Holtek, the HT82K629A chip has USB/PS2 auto-sensing - so you can just solder a PS/2 connector instead of the USB one. http://www.holtek.com/english/docum/computer/82k629a.htm Pin17 is USBD+ & PS2 CLK Pin18 is USBD- & PS2 DATA |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9060 |
Gerbers would be great.  Smoke makes things work. When the smoke gets out, it stops! |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 813 |
Ok, here are the files... Enjoy it!
2014-06-05_064047_Keyboardemulator-USB_V0.2_140605_Circuit.p df 2014-06-05_064115_Keyboardemulator-USB_V0.2_140605Layout.pdf 2014-06-05_064135_Gerber.zip Frank |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9060 |
Hi there.
Thanks for the files. I don't suppose you could sell me some fully built PCB's of this could you? If that is something you would like to do, please PM me. While I COULD make my own PCB's from your Gerber files, the thought occurs that "Why re-invent the wheel?" - you already have done it, why not just get your boards from you, and save me the hassle of having to get PCB's made and then having to assemble them. Thoughts? Opinions? Smoke makes things work. When the smoke gets out, it stops! |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 813 |
Hi Grogster! No, I am selling no PCB's or any components - Maybe is WhiteWizzard or Don interested on selling it? I can add fiducials to the data... I ordered my PCB from a little shop in Germany and drilled it by hand (I re-invented the breadboard - my system says there are 560 holes) within 1 1/2 hour! 
The shop can't make vias - thats the ground why all components are soldered on the bottom and rivets (correct word?) are set for connecting... Frank |
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