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Topic: selfmade turn signal for bike (5x10 LED matrix) (Read 257 times) previous topic - next topic


10 transistors, criminy. Get a MAX7219, redo your matrix to be 8-wide, and all you need are 5 wires to the Arduino (3 data control, power/ground). And 1 resistor.

Just for simplicity's sake.
There are ways to handle up to 64 LEDs, but that would involve a little creative matrix building and coding.


Aug 20, 2016, 10:32 am Last Edit: Aug 20, 2016, 11:24 am by PaulRB
10 transistors
No, 5 transistors, one for each row, is what I am suggesting.

To spread the current demands over the atmega's ports, I suggest using:

Columns pins: 2, 3, 4, 5, 6, 7, 8, 9, A0, A1
Row pins: 10, 11, 12, 13, A2

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