Optisk støv og røg sensor

Low Current Consumption (MAX: 20mA)
Typical Operating Voltage: 4.5V to 5.5V (MAX: 7V)
The presence of dust can be detected by the photometry of only one pulse
Enable to distinguish smoke from house dust
Dimensions: 1.81 x 1.18 x 0.69'' (46.0 x 30.0 x 17.6mm)

Se evt. hvordan du anvender den sammen med Arduino på: 
http://www.instructables.com/id/How-to-Interface-With-Optical-Dust-Sensor/