Description: HAT, which stands for ‘Hardware Attached on Top’, is a specification designed to facilitate the connection of additional boards to single-board computers. This specification allows HAT boards to connect easily and efficiently, providing a standardized interface that includes a 40-pin connector and an EEPROM (Electrically Erasable Programmable Read-Only Memory) that stores information about the board, such as its version, serial number, and features. One of the most notable features of HAT is its ability to provide automatic identification of the additional board, simplifying the setup and use of connected devices. Additionally, HAT allows power supply through the same connector, reducing the need for extra cables and improving system organization. This specification has been fundamental in the development of a wide range of accessories and modules that expand the capabilities of various single-board computers, from sensors and displays to motor drivers and communication modules. In summary, HAT not only enhances the connectivity and functionality of these devices but also fosters innovation in the creation of projects and applications in the fields of electronics and programming.
History: The HAT specification was introduced by the Raspberry Pi Foundation in 2014 as a way to standardize the connection of additional boards to single-board computers. Its development was based on the need to simplify the integration of additional hardware and improve the user experience when working with these devices. Since its launch, HAT has evolved and become a widely adopted standard in the single-board computer community, driving the creation of numerous compatible accessories.
Uses: HAT is primarily used to connect modules and accessories to single-board computers, allowing for the expansion of their capabilities. This includes connecting sensors, displays, communication modules, motor drivers, and other devices that can be used in electronics and programming projects. The HAT specification facilitates the automatic identification of these devices, simplifying their use and setup.
Examples: Examples of HAT boards include the Sense HAT, which provides a variety of environmental sensors and an LED matrix, and the PiJuice HAT, which offers a portable power solution for single-board computers. Other examples are the Motor HAT, which allows for motor control, and the Enviro HAT, which includes sensors for measuring air quality and other environmental parameters.
