hi guys, finished first project, put in box etc , powered battery , mmm…it's not working.
when it's plugged usb works unplug stop's working properly.
the project rfid scanner relay, correct card , relay opens.
after power-up battery led's blink etc , first scan works after cards won't scan.
i have tried portable 5v usb battery, aa batteries etc…makes no difference.
any ideas guys?
when it's plugged usb works unplug stop's working properly.
the project rfid scanner relay, correct card , relay opens.
after power-up battery led's blink etc , first scan works after cards won't scan.
i have tried portable 5v usb battery, aa batteries etc…makes no difference.
any ideas guys?
what board?
post code.
post code.
Arduino Forum > Using Arduino > Programming Questions > Project stops working when USB is unpluged
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