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Count, can I ask why you used the buck converter? I breadboarded everything today, and the servo I have runs at a maximum of 6 V, and the Vin pin on the Nano will accept 6-20 V (unregulated). By just switching a couple wires around, and putting the Vcc of the screen on D2, I managed to get everything together without the converter. I was just wondering as to the benefit of it