FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -8 out of the 40 GPIOs are connected to the ground. You can find them with the 3 letters GND. One additional warning: don’t ever connect the ground directly to a power supply pin (3.3V or 5V)! This creates a short circuit and can definitively burn your Raspberry Pi 4 board.

Detailed explanation-2: -All Raspberry Pi models have a number pins which can be used as I/O pins. Not all pins are I/O pins, some of them have a supply voltage (3V3 and 5V0), some of them are ground (GND). The pin header comes in two versions: B version: The old Raspberry Pi 1 B, isn’t sold anymore, had a total of 26 pins.

Detailed explanation-3: -A Raspberry Pi 4 board has 40 pins on it. Among these pins, we have four power pins on the Raspberry Pi, two of which are 5v pins and another two are 3.3v pins. The 5v power pins are connected directly to the Raspberry Pi’s power input and we can use these pins to run low power applications.

Detailed explanation-4: -The Ground pins on the Raspberry Pi are all electrically connected, so it doesn’t matter which one you use if you’re wiring up a voltage supply. Generally the one that’s most convenient or closest to the rest of your connections is tidier and easier, or alternatively the one closest to the supply pin that you use.