Shadowandy’s Arduino-based Dust Sensor project:
Put together a dust sensor using Arduino Mega 2560, Shinyei PPD42NS dust sensor and LCD shield.
The codes and wiring instructions for Arduino Mega 2560 and Shinyei PPD42NS is as follow. However, I did include Serial output so you can view the sampling results using Arduino IDE’s Serial Monitor (9600 bauds).
Project info at Shadowandy’s blog.