FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -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-2: -Each of the pins on the 40 Pin header have a designated purpose. The different types are described in the table below. GPIO pins are standard general-purpose pins that can be used for turning external devices, such as an LED, on or off. 5V and 3V3 pins are used to supply 5V and 3.3V power to external components.

Detailed explanation-3: -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. 5V pins: The 5V pins are used to output the 5V power supply provided by the Type-C port. The pins are numbered 2 and 4 on the Raspberry Pi 4 device.

Detailed explanation-4: -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-5: -The 40 pin expansion header provides power and ground rails as well as 28 GPIOs (general purpose inputs outputs). The GPIOs are controllable IO lines and as the name suggests may be individually configured to be inputs or outputs. The inputs may be used to read sensors such as switches, ADCs, thermometers etc.