Make: AVR Programming 原版PDF by Williams

Microcontroller projects are ubiquitous in the hobbyist/hacker/Maker world, and with good reason. Microcontrollers stand directly in the middle ground between the hardware world of buttons, motors, and lights and the software world of algorithms, connectivity, and infinite possibility. Microcontrollers are part computer and part electrical component. They can also be the metaphorical glue between the real world and the virtual world.