The PCB itself is beautiful. Nice art! ATtiny85 boards can be found on eBay for about US$1.50 (including shipping). They are “solderless breadboard” friendly, except for the power and ground pins.

In order to program the Attiny85 MCU, you gonna need an ISP programmer.” Adding components to this PCB is pretty easy and straight forward, watch the video for a better tutorial of PCB assembly.

“Possibly the smallest ATtiny85 based ‘duino derivative”. Indeed! When Olimex announced the Olimexino 85s as the smallest Arduino ever, [Tim] took that as a challenge. His very small Ar… ...

ISP :Any ISP that can program ATtiny85, this time I am using a Digispark act as a littleWire. Battery :In order to meet the ring size, I choose CR1220, I expect it can last over half an year.