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 position.Its getting power through the A0 pin from the sensor.when the sensor is sending lower voltages, the Micro Pro's power LED dims down and back up as the signal increases...is this normal or am I doing something wrong???
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