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The D1 R2 uses the same power supply arrangement as the Arduino Uno (albeit with a better switching regulator for the 5V instead of the Arduino's basic linear regulator). So it should be safe to use both the USB and the barrel jack at the same time. The NodeMCU doesn't include a 5V regulator and doesn't have the power switching circuitry of the Uno / D1 R2,...


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After looking into it and seeing all the previous answers, I noticed the Vin pin can be used as an output but only up to the input from the barrel connector. When using a 9V input to the barrel jack, the voltage difference between the ground pin and Vin pin was just under 9V. Similarly, when measuring the voltage difference when using a 12V supply, the ...


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You cannot. You are misunderstanding, what that pin is. Vin means Voltage In. It's a voltage input, connected to a voltage regulator, which will regulate the provided voltage at that pin down to 3.3V for the Wemos to work with. It is not an output. The regulator cannot convert the 3.3V from the Wemos to 12V. That is not, what it is build for. To get 12V you ...


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You can connect all the grounds together and the circuit will be safe. If the BEC outputs 5V, you can feed it directly to the Arduino's 5V pin. Any more volts and you'll need to feed the BEC output to the Arduino's VIN pin.


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As already stated in the comments, the voltage of your power supply is the problem. The Arduino has a linear voltage regulator at the Vin pin. It dissipates the excess voltage as heat. The higher the supplied voltage, the lower the current, that you can draw before it overheats. The regulator on a genuine Arduino should go into thermal shutdown, while the ...


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You have basic misconceptions there: Vcc is the power input (!) for the Atmega, not an output to provide current to other parts. Your power supply (whatever you use as one) should be connected to every Vcc pin at the same time. Sure, the Vcc pins are internally connected, but the Atmega has multiple of them, so that the needed current does not have to flow ...


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