Dust Sensor (1.4)

[epierre]

The Shinyei PPD42 has now its sketch :
https://github.com/empierre/arduino/blob/master/DustSensor_Shinyei_PPD42NS.ino
@hek either the SamYoung or Shinyei can be proposed, the sharp is definetly out of the race ...

Both those sensors give similar values whih is a very good point.

[epierre]

The Shinyei PPD42 has now its sketch :
https://github.com/empierre/arduino/blob/master/DustSensor_Shinyei_PPD42NS.ino
@hek either the SamYoung or Shinyei can be proposed, the sharp is definetly out of the race ...

Both those sensors give similar values whih is a very good point.

[epierre]

A good question I had from Rob:

What is the Unit of the Dust sensors ? I quess it is not in ppm ?

This is in particules per cubic inch (in imperial units) or particules per 283 ml.

I can't find a ppm conversion, at best I could do a particules per litres by multiplicating per 3.53. what do you think ?

[epierre]

ok so taking some assumptions for the PPD42NS with datasheet in particle per cubic feet:

http://billpentz.com/woodworking/cyclone/dylos.cfm

 To estimate the mass of particles in this range we simply divided by 100 to obtain micrograms per cubic meters (μg/m3) of PM2.5 respirable. The resultant value can be converted to mg/m3 if desired by dividing again by 1000. 

 PM2.5 = (753*3.53) / 100 = 25.2395 μg/m3  = 0.0252395 mg/m3

Now for the DSM501 and PPD42NS corrected, the formula to PPM:

https://en.wikipedia.org/wiki/Air_pollutant_concentrations

ppmv=mg/m3 * (0.08205*Tmp)/Molecular_mass
ppmv=0.0252395 *  (0.08205*19)/0,01 = 0,207

[epierre]

Warning on Shinyei:

The only calibration data provided by the manufacturer's datasheet is for cigarette smoke particle count concentration. Based on these data, there is an approximate error of 25% in particle measurement across most of the sensor's range. At very low concentrations, the error becomes substantial (e.g., over 50% error below 100,000 particles per cubic feet) 

http://www.researchgate.net/publication/271225140_A_distributed_network_of_low-cost_continuous_reading_sensors_to_measure_spatiotemporal_variations_of_PM2.5_in_Xi'an_China

[Tore André Rosander]

Does anyone have info on how to wire the GP2Y1010AU0F?

My cable is almost the same as on the picture https://www.mysensors.org/build/dust

The red, black and yellow is in the same place, but from there it goes white, green, blue.

EDIT: Found that Red is vcc, black is signal and yellow is ground.
Do this sensor need calibration?
And what is considered a high value for dust?

And is it only those three wires that needs to be connected to the arduino? Not the led?