Customize your own Raspberry Pi HAT with Pi Crust PortoHAT Kit with EEPROM.
The Pi Crust ProtoHAT has a grid of prototyping soldering holes for attaching chips, resistors, LED, potentiometers and more. The holes are connected underneath with traces to mimic the solderless breadboards.
The kit includes a printed circuit board and a single 2 × 20 GPIO Header for Raspberry Pi already soldered.
This version comes with a blank 24C32 I2C EEPROM soldered on and connected to the EEDAT/EECLK lines so you cannot 'stack' it with other HATs. However, you can program in the EEPROM to make a self-identifying setup using the Raspberry Pi Foundations' HAT specifications.