DIY UPDI programmer with additional data line isolators, allowing you to safely work on high-voltage (HV) projects. This project is based on the original microUPDI project by MCUdude, and the firmware ...

Why not turn it into an In System Programmer for AVR chips? [Paul] came up with HUB ISP as an answer to the chicken-or-egg problem we’ve seen with other diy programmers.