USB to send ASCII characters to PC


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  1. #1
    Join Date
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    Default USB to send ASCII characters to PC

    Regarding USB my level is at almost zero.

    I would like to make an RFiD reader and send the card serial number to a PC through USB port. Preferably not as RS232 too USB, so that the user on the PC side will not have to install anything.

    I have a barcode reader that is connected to a USB port. No drivers installed. When a barcode is read, if there is a program open (say word, excel, Notepad whatever) the code is displayed just as if one was hitting the keyboard.

    Very neat and simple. Can this be done with a PIC?

    Thanks,
    Ioannis

  2. #2
    Join Date
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    Default Re: USB to send ASCII characters to PC

    It can. What you're looking to do is basically implementing a USB keyboard using USB HID. When connected it will, to the PC, look like any old USB keyboard. I've managed to do it using examples on the forum, the tricky parts are to get the descriptor correct and the various scan codes. I can't get to the code right now but I can probably dig it out later - if you haven't already found examples to work from by then.

    /Henrik.

  3. #3

    Default Re: USB to send ASCII characters to PC

    Do a search for USB keyboard emulator, there are a couple of threads - here is one http://www.picbasic.co.uk/forum/showthread.php?t=8291, once you get the keyboard working you can the take the data from RFID and put it into a modified keyboard routine.

  4. #4
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    Default Re: USB to send ASCII characters to PC

    Thank you both. Those info are enough to get me started.

    Ioannis

  5. #5

    Default Re: USB to send ASCII characters to PC

    Perhaps you could use one of the three 1 bit outputs NumLock, CapsLock and ScrollLock to implement flow control for your hardware.
    George

  6. #6
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    Default Re: USB to send ASCII characters to PC

    George,
    I do not understand where flow control is needed.

    Ioannis

  7. #7

    Default Re: USB to send ASCII characters to PC

    As you will be creating another keyboard, any output will be sent to what ever window has focus.
    George

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