Great write up, and very timely for me, as I’m transferring a project from breadboard to PCB today. I, like many others here, test and check each step of the way. Everything metered fine, no shorts or solder bridges. finally powered it up, the correct lights came on, it executed once, then died. Mild heart failure. Powered down, re-metered everything, powered back up, same results. Only then did I check the 9v battery powering my Arduino. Yup, 5.16 volts. Enough to power the lights, but not enough to execute it’s command more than once. Seems as though my brain wasn’t the only thing lacking power today.
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