I was working on a small project were I needed a small MCU to accomplish some simple task so I thought to make a small development board for an Attiny84 or Attiny841.
Here a video of the first sketch, obviously the Blink, running on my board:
It has both Serial and ISP pins:
For the schematics I followed the circuit of Nick Gammon (one of the author of the Arduino Project) here the link to his blog.
About the core I am using both AtTiny Core from DrAzzy but it lacks of the serial bootloader which this other core from Sleemanj has. Maybe I will make another board for the AtTiny167 which is a 20pin!
EDIT: i did ;)