GPIO/Electronics question - Raspberry Pi Forums

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hello! total begginer both eletronics , raspberry pi, , have 2 questions.

first.

there difference between pluggin led circuit -3v pin , grd pin? arent both of them same? if not, should use grd 1 for?

second, built basic circuit:

image

coded in python, counts in binary 7.

works great, there odd thing makes me curious:

red led more brighter other 2 when counting, , if happen touch red led when circuit off (or if hold positive side out of breadboard while leaving negative 1 going resistance , ground) led turns on dimly. replaced red 1 , behavior didn't occur.

why this?

there no -3 volt pin. there no negative voltage rails in rpi.

+3.3 pin not same ground (gnd).


raspberrypi



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