it looks great! i bought the particle laser sensor listed above through amazon (should arrive in 2 days) which i can interface with a pc.
The only thing I struggle to find out is a good set of reference how particle size corrilates to cleanlyness.. say in a clean box of clean bench what is a good number (to for example know if your filters need changing).
Say for laser optical work or some rough semiconductor or open hard drive work as reference!
I noticed your display also shows PM1.0 this is something that isn't to be found on the other laser particle counter (says PM10 and 2.5). is this an advantage of the sensor you bought?
Thanks, but I was aiming at indoor air quality. For example, I am alerting based on USEPA 24h limits.
// Levels for alarm based on EPA 24h limits
unsigned long PM2_5alarm = 35.0;
unsigned long PM10_0alarm = 150.0;
I don't know squat about clean rooms and the like but a quick search looks like there are all sorts of "standards" e.g.,
https://www.americancleanrooms.com/cleanroom-classifications/. I have no idea how suitable your device will be for such purposes (again the validation issue previously mentioned).
Edited to add: as for the 1.0 um - well, yeah, I like that, but it may be included in other sensors. You have to look at the datasheet. For example, it should say something about "smallest particle size detected" or something similar. It is then "assumed" that a measure reporting, for example, <2.5 um is including the smallest size particles the sensor can measure.
BUT, and I know I keep coming back to this, I have no way of validating or calibrating these sensors. I am basically basing whatever utility mine has (and it is more experimental interest than anything very important) on the data sheet and gross empirical observation (like the measures in response to some smoke that I mentioned earlier).
These are very important questions and I would be very concerned to find the answers, if the application is also very important - you know what I mean?