I am working with a sensor that puts out an analog 0-5V through its output signal pin. It has its own power source. I connected the signal wire to A0 on my pro Micro 5v/16mhz. I also made ground common between the two. Now the Micro Pro is powered up even if I have its power supply in the off posi…

Sensor's +Vsignal to Analog pin is giving arduino powerup voltage. Is it normal?

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