One 5x7 Led Dot Matrix Clock
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I see some "hot pixels" in that display (look at character 7 or 4 etc). You either are using a resistor in the sink of those led rows, or. most likely, you are exceeding the maximum sink current provided by the chip, which is 25mA, a little low compared to 50-80mA of Atmega's.
McGuywer 2 years ago
Thanks for your comment. However, using a resistor doesn't help much. The best way is using constant current source to drive the led. That makes the circuit bigger.
punkkyja 2 years ago