Versão - 2015
Arduino = Comunidade + Placa (Microcontrolador Atmel) + Bibliotecas + IDE.
(back) Dave Mellis, Tom Igoe; (front) Gianluca Martino, David Cuartielles, Massimo Banzi
http://www.arduino.cc
Download - http://arduino.cc/en/Main/Software
https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v32
AVR- DUDE (AVR Downloader/UploaDEr)
http://www.nongnu.org/avrdude
http://savannah.nongnu.org/projects/avrdude
https://gcc.gnu.org/
http://www.nongnu.org/avr-libc/user-manual/index.html
http://www.processing.org/
http://wiring.org.co/
https://www.arduino.cc/en/Main/ArduinoBoardUno
http://shieldlist.org/
Apenas Arduino
Datasheet HC-SR04:
Porta Analógica e PWM
http://www.microcontrollerboard.com
Lib externa - instalando