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: Building a square-wave organ, an AM radio, a temperature logger, and custom USB devices .

: Direct port manipulation to build "Cylon Eyes" (LED scanners) .

Use the standard , including avr-gcc for compiling, avr-libc for standard libraries, and avrdude for uploading code . Topics & Key Projects

: Learning low-power modes and interrupt-driven I/O for battery-operated devices . Who Is This For?

by Elliot Williams is a definitive guide for makers who want to move beyond the Arduino IDE's abstractions and program Atmel’s AVR microcontrollers at the register level . Published by Maker Media/O'Reilly in 2014, it remains a highly-rated resource for those seeking to "squeeze" more performance and efficiency out of 8-bit chips like the ATmega328p . Core Premise: Moving Past Abstraction

: Interfacing with Analog-to-Digital Converters (ADC) and Pulse Width Modulation (PWM) .