Here’s a no-PCB Arduino that doesn’t obscure the DIP footprint of the AVR chip. It’s built on an ATmega88 chip, and includes a programming ... it to be used in a breadboard or DIP socket.

[Danac1886] posts a video with a bunch of experiments with the ATtiny series of microcontrollers ... Ardino as an ISP so all you need is another Arduino lying around in case you do not have ...