I have a project where I have a Leonardo with an ethernet shield and an RS485 shield stacked. The RS485 controls electro-mechanical digits for a scoreboard sending info it gets via the ethernet connection. If I power the Leonardo via the USB connector, either from the laptop or an Amazon charger, ev…

[image] mwtheplumber: However if I power it from the barrel connector it all stops working after a few seconds. I have tried a 9V and a 12V supply to the barrel and the results are the same. So don't power it from the barrel connector, but do it properly. Get a 5V power supply and power the A…

Power Problem with Leonardo

Other Hardware Motors, Mechanics, Power and CNC

sterretje September 17, 2021, 8:03pm 15

Just be aware that you should not power on the 5V pin and at the same time have USB connected. This applies to boards that use a FET to switch power between Vin and USB

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Power Problem with Leonardo

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