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

• https://learn.sparkfun.com/tutorials/tiny-avr-programmer-hookup-guide/attiny85-use-hints
• https://mjvo.github.io/tutorials/circuits/attiny85/