The target:

Goal is to create a "DIY bus pirate" using hardware and having features tailored to what i use often.

It has TWI, SPI UART/RS485, and a digital and analog input and output.
All are buffered and the cool part: all voltage levels are changeable. So you can use 5V, 3,3V and lower devices with this tool!

Plan is to make it controllable via serial-USB with clear-text. So you only need putty and get started. -> See Yukari V1

Lets see where this goes.