A PCB that sits over the top of a DIP Attiny85 so you can easily attach a ISP cable
Youtube video - https://youtu.be/_xBqEfxCav8 Blog post - https://facelesstech.wordpress.com/2018/03/17/attiny85-backpack-programmer-header/ Oshpark order link - https://oshpark.com/shared_projects/yPJr1HhT