Small LED dot matrix display

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Uploaded by on Oct 22, 2008

Here is a small LED dot matrix display I've built. It's monochrome and the resolution is 30x7 pixels.

The soldered PCB is the LED driver, which accepts the serial column select signal from the PIC microcontroller and decodes it to select one of 30 columns. This is done using 4x 8-bit serial in parallel out (74HC164) shift registers. The outputs are fed to 5x ULN2003A transistor arrays to sink current for maximum brightness (the displays are column cathode).

The PIC driving the display is a PIC16F883 running at 20Mhz. The rows are directly driven by the microcontroller.

"NO DATA!" is displayed as the controller PIC did not detect a serial connection for data transfer. Wait for my next video to see what that does!

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Science & Technology

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  • We have the same protoblock AND the same keyboard!

    I really want to do this and have a basic understanding of digital and analogue electronics. How would I start going about doing something like this. I do have a dot matrix LED panel but no driver chips. Can buy them though.

  • TO MANY WIRES it makes my brain hurt

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