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README.md

Arduino Notes

Prime Links

Arduino - official home page
Arduino Playground
Arduino Source - GitHub

Timers and Pins

Timer0 - Used for millis and delay; also analogWrite/PWM on pins 5 and 6
Timer1 - analogWrite/PWM functions on pins 9 and 10; Servo library; Tone library (second tone)
Timer2 - analogWrite/PWM functions on pins 3 and 11; Tone library (first tone)

Tone library

On a standard Arduino board, the first tone will use timer 2 (so PWM on pins 9 and 10 will not be available);
the second tone uses timer 1 (preventing the Servo library and PWM on pins 11 and 12 from working).
On a Mega board, each simultaneous tone will use timers in the following order: 2, 3, 4, 5, 1, 0.”

Servo Library

The Servo library uses the same timer as analogWrite on pins 9 and 10, so you can’t use analogWrite with these pins when using the Servo library.

ATmega328

DIP Pins

Arduino Pro Mini

Official Arduino Pro Mini site
Arduino USB-to-Serial Tutorial - Programming the Pro Mini - great in-depth tests with various USB to serial devices by Julian Ilett.

USB-to-Serial Programming

Pin Connections as described on weworkweplay:

Connect USB DTR to Arduino GRN, aka DAW on some boards
Connect USB RXD to Arduino TXD
Connect USB TXD to Arduino RXI
Connect USB 3.3V to Arduino VCC
Connect USB Ground to Arduino BLK, aka GND on some boards

Arduino Nano

See the Official Arduino Nano site for board details.

Power

Specs:

Operating Voltage (logic level) 5 V
Input Voltage (recommended) 7-12 V
Input Voltage (limits) 6-20 V

The power source is automatically selected to the highest voltage source from one of:

the Mini-B USB connection
6-20V unregulated external power supply (pin 30)
5V regulated external power supply (pin 27)

See also:

Arduino Uno R3: Directly supply regulated 5V to 5V pin?

Pins

ATtiny