I bought a couple of 8x8 led matrices on ebay. I tested them with a resistor and a 5v power supply. I managed to find out the right connection to led up every dot. Works fine! So the next step was to make drive it with the arduino. I ordered two 74c595 chips. One for the anode, and one for the cath…

8x8led matrix troubles with 2x 74CH595

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