Nano as ICSP / UPDI cases
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I build a lot of stuff using Arduinos, and especially with ATtiny MCUs. ATtinys require the use of an ICSP programmer (the older attiny series) or a UPDI programmer (the newer attiny series). Both programmers can be fashioned from a simple Arduino Nano, and "Arduino as ISP" is included in ATTinyCore ("jtag2updi" is included with MegaTinyCore). Guides for the electronics: [Arduino Nano as an ISP Programmer](https://www.martyncurrey.com/arduino-nano-as-an-isp-programmer/) [DIY UPDI USB programmer which can be made with cheap hardware](https://daumemo.com/diy-updi-usb-programmer-which-can-be-made-with-cheap-hardware/) I modified [Cheap DIY UPDI USB programmer](https://www.thingiverse.com/thing:5208737) from [daumemo](https://www.thingiverse.com/daumemo) to allow multicolor printing and include an ICSP case with holes for the LEDs (although they aren't really necessary if you use a filament that isn't completely opaque). The files are intended to be used with the [z-hop multicolor method](https://tinyurl.com/3t2s2nju).
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