The first pin is labelled with a minus sign, this indicates that it is the GND pin.
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The middle pin is labelled with a plus sign, this indicates that it is the VCC or 5V pin.
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The pin on the other end is labelled with DIN, this indicates that it is the Digital Input pin.
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main.py
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Terminal
screen /dev/tty.usbmodem0000000000001 115200 >>> led = Pin(25, Pin.OUT) >>> from machine import Pin
Breadboard
Breadboard