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    Help: 5x7 led matrix driven with pic16f84a

    HELLO
    i want to build a led matrix to display letters and numbers and i want to start with one 5x7 led matrix but the problem i do not know and what to use to drive it please guide me to start ?

    •   Alt10th February 2013, 19:28

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    Re: Help: 5x7 led matrix driven with pic16f84a

    hello any one



    •   Alt12th February 2013, 19:08

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    Re: Help: 5x7 led matrix driven with pic16f84a

    The PIC you want to use can drive up to 13 LEDs (13 I/O pins are available), but if you intend to use some I/O pins for other purposes you should use a LED driver. A LED driver is an integrated circuit that decodes an input code and outputs high or low (based on the code you send) on the pins used to drive the LEDs. They're ususally driven with a serial interface. An example is the TLC5925 ( *Datasheet link* ) which can drive up to 16 separate LEDs, but there are other ICs that can drive even more LEDs.
    What you should do is to choose a LED driver capable of driving a 5x7 matrix (35 LEDs), and then program your PIC to send a serial code to the LED driver.



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