Capacitive slider fails to work on 5v but works when using USB power

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i've built 2 piece aluminium foil capacitive sensor use touch slider.

the touch sensor controlling rgb led strip, adjusting it's brightness.

while working in arduino ide have values coming touch slider. once unplug nano , apply 5v vin pin touch sensor no longer works.

seeing can't see serial monitor while nano not connected laptop, unsure how go debugging it. suggestions appreciated.

can suggest might @ play here?

how powering sensor circuit? +5v pin?

another troubleshooting idea might use lcd , softwareserial print out debug messages.


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