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Re: QS18VN6LP: Wiring Diagram???
The VRM is a better choice since it is a boosted supply. The PDP will drop below 10 volts causing the sensor to brown out. The sensor might, might sometimes or might not pull low enough for the roborio to read it as a 0. One of the issues with using +12 volt sensors with 3.3 volt IO. That is the reason for Brian's modification.
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If you don't know what you should hook up then you should read a data sheet
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