A hardware hackers best frield
The GreatFET One is an extensible board with two USB ports, and 100 expansion pins. Due to it's open source design the GreatFET One has plenty of expansion boards to choose from. It is your essential gadget for hacking, making, and reverse engineering. By adding expansion boards called neighbors, you can turn GreatFET One into a USB peripheral that does almost anything.
Whether you need an interface to an external chip, a logic analyzer, a debugger, or just a whole lot of pins to bit-bang, the versatile GreatFET One is the tool for you. Hi-Speed USB and a Python API allow GreatFET One to become your custom USB interface to the physical world.
programmable digital I/O
serial protocols including SPI, I2C, UART, and JTAG
analog I/O (ADC/DAC)
versatile USB functions including Facedancer
high-throughput hardware-assisted streaming serial engine
four fabulous LEDs!