A heads up for these, the ATtiny is a different family than the ATmega's in the Arduino Uno. They are not 100% compatible, and if you are a beginner that can be

A heads up for these, the ATtiny is a different family than the ATmega's in the Arduino Uno. They are not 100% compatible, and if you are a beginner that can be problematic. Also the Tiny85 in particular that these modules use expose very few pins (5 usable). That said, I use the Tiny85 all the time as they require minimal external components, so they are good to drop into a design for taking care of functions like interfacing peripherals or simple logic. For people just starting out though I'd recommend a Nano clone, they can be had for about the same price.