Super small and cheap Arduino with an ATtiny13a
Consider using a “bare chip” for your next Arduino project. The Atmel (Microchip) ATtiny13a is a great option where small size and low cost are a requirement.
Seeeduino XIAO - The Cheap, Fast, Mini Go-to Arduino Board!
If you’re looking for an inexpensive, easy-to-use, feature packed Arduino compatible microcontroller with a small form factor, check out the Seeeduino XIAO from Seeed Studio. Here’s my sum-up of this impressive board.