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Forum Index : Microcontroller and PC projects : Emulating keyboard
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Juri74 Senior Member  Joined: 06/02/2012 Location: ItalyPosts: 162 |
Hello!! Maximite can easily connect and decode a ps2 keyboard.. but could be possible do the oter way? I would generate key codes when input pins go to 1 or maybe when some analogic input(s) reach some value. This to command a proper program on the pc side using the ps2 connector... In a nutshell Maximite should act as a keyboard! Have anyone done that? Juri |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9588 |
It is something I have wanted to do myself on more then one occasion. I think the issue is mainly speed in that the uM and BASIC cannot respond fast enough for the host computer to believe there is a keyboard connected, so a uM KB would tend to be ignored by the host computer for that reason. CG(CircuitGizmos) have a controller that mimics a PS/2 keyboard, but I seem to remember them reporting that this does not work with a PC either. IF you know exactly what keys you wanted to use on a normal keyboard, your options are really (1) hack a normal working keyboard and run wires from the keys you want via something like a 4066 for isolation, or (2) make use of a PS/2 keyboard controller chip. There was a member here from Germany(sorry, I forget the member) who produced a keyboard emulator with rows of connections so you could just plug into whatever keys you wanted. I will see if I can find the thread. He was not offering PCB's or kits, but did upload the gerbers, from what I can remember, so you could make your own one. Smoke makes things work. When the smoke gets out, it stops! |
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 6269 |
I have taken a keyboard apart to get the keyboard IC and throw away the keys. I used a maximite to close the key contacts as required. This is easy for sending one keypress but not so useful for a string of keys. Jim VK7JH MMedit |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6269 |
I might be possible to do with CFUNCTIONS in the MicroMite Mk2 If so, it would be a useful addition to the library. For those interested in giving it a try, Here is a description of the PS/2 interface. http://www.computer-engineering.org/ps2protocol/ Jim VK7JH MMedit |
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Synergetic Newbie  Joined: 14/01/2013 Location: New ZealandPosts: 22 |
In the past have input "keyboard data" from numerous serial devices ( electronic scales , scanners etc)... by using a windows software driver that input the serial data to the Windows keyboard buffer.. Works well ..you can automate keystrokes to ensure you are on the appropriate input window as the drivers can be configures with preamble and post data based on the serial data input to the driver... |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 946 |
Hi Juri, you can try to use my keyboard emulator from this thread. (Grogster mentioned it...) It works also with PS/2. You should be able to use a Micromite or Maximite to "push" any button with a AQY210EH PhotoMOS relays (or with a two Mosfet equivalent circuit) Frank |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9588 |
Ahhhhh - Tim Curry! I thought it was you! Smoke makes things work. When the smoke gets out, it stops! |
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| Juri74 Senior Member Joined: 06/02/2012 Location: ItalyPosts: 162 |
Hello all again Using a keyboard encoder chip could be an idea, however like TassyJim said it will start to be very hard if i want to send a series of keys (or simulating simultaneous button push, like ctrl+alt+del) any more info about that CFUNCTION for Micromite mk2? |
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G8JCF Guru Joined: 15/05/2014 Location: United KingdomPosts: 676 |
Look here http://www.g8jcf.dyndns.org/mmbasicmkii/index.html The only Konstant is Change |
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