I was using my Arduino UNO after building the project
at Simplest UNO Digital Clock Ever | Arduino Project Hub when my computer went to sleep. I had the 9V battery included in the kit plugged in, so it seemed to be stuck in a reset loop (I had some LEDs in parallel with the data pins). I unplugged and plugged the battery back in, and it booted properly, but the LCD was very dim. Why ideas why?
Because 9V "transistor batteries" are p00p.
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