GivinTheRaspberry wrote: ↑
Mon Nov 19, 2018 6:28 am
Also, another question, the numbers in the Pi's GPIO pins in the boxes are the pin numbers, 1-40, what are the other numbers on each pins? Some are voltages and some are just numeric?
The pins marked with voltages are fixed voltage supply or ground/0V pins. Their state cannot be changed. The ones with numbers are the GPIO numbers, often referred to as BCM numbers (for BroadCoM, the makers of the chip at the heart of the Pi). There is another numbering scheme called WiringPi, but that is not used here.
If your code sets (BCM) GPIO 27 to output mode and writes a "1" to it, pin 13 on the board will change from 0V to 3.3V.
An interactive guide to what each pin is capable of is shown at https://pinout.xyz/