Atmega324p 'Hello World' on OSX
A blinking LED 'Hello World' project including breadboarding an Atmega324p with an LED, wiring the AVR Dragon programmer (ISP mode) to the chip, and using the command line to communicate with the programmer. This includes using CrossPack (a WinAVR variant) with links to supporting material such as the Atmega's datasheet, CrossPack download URL, avrdude manual, and other resources.
Atmega324p UART Serial Communication
Basic UART serial communication with the Atmega324p via the command line - including a discussion on the Atmega's USART registers, baud rates, USB serial ports on your Mac, and serial console use with Screen and Arduino's Serial Monitor.
Breadboarding Your Power Supply/Regulator
Wiring a power supply/regulator to your breadboard to power your Atmega and accessories using a wall wart power supply of 9 - 12v.
Wiring your MAX232 chip for RS232/UART communication.