FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -There are 40 pins in this model and among them, 26 are GPIO pins. The Raspberry Pi model includes two 5V pins, two 3.3V pins, eight ground pins and two reserved pins.

Detailed explanation-2: -Most models of the Raspberry Pi have a 40-pin header, as shown in the image above. Of the 40 pins, 26 are GPIO pins and the others are power or ground pins (plus two ID EEPROM pins, which you should not play with unless you know your stuff!).

Detailed explanation-3: -This is 40-pin GPIO Extension Board and GPIO cable for Raspberry Pi model B+, 2 model B and 3 model B.It is used to lead out pins of Raspberry Pi to breadboard to avoid GPIO damage caused by frequentplugging in or out.

Detailed explanation-4: -The Raspberry Pi 4 board has a GPIO header with 40 pins. This GPIO header is also the same for Raspberry Pi 3 boards, so this guide applies to both versions. GPIOs allow you to easily use hardware features and communication, directly from a computer – the Raspberry Pi microprocessor.

Detailed explanation-5: -The Raspberry Pi 400 contains a single 40-pin expansion header located on the back of the keyboard housing providing access to 28 unique GPIO pins.