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Form description
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(1) Three naming (coding) methods for Raspberry Pi pins
Three ways to name the Raspberry Pi pins:
The WiringPi number is the pin number of the functional wiring (such as TXD,
PWM0, etc.); the BCM number is the Broadcom pin number, also known as GPIO;
the physical number is the number corresponding to the physical location of the pin
on the Raspberry Pi motherboard (1 ~40).
(2) 3.3V/5V pin and GND pin
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