PICAXE 28 pin microcontroller chip.
Enhanced PICAXE28 chips with 8x memory and many additional features such as I2C bus support. Part # : AXE010x2.

 

PICAXE is a neat entry-level microcontroller system that is relatively cheap to get started with. The chip is programmed with a simple serial connection and the BASIC development environment is free! PICAXE has some excellent educational applications and support, and is a great entryway into more complicated embedded systems. If you're look for a place to start with microcontrollers, PICAXE is a great way to go!

Documents:

• Datasheet
• What is PICAXE?