SDS011 tubing solution

I just discovered that .25" shrink tube fits the inlet nipple of the SDS011. Prior to this i used a .25" ID automotive tubing, which had a thick wall and which I had to wedge in against the circuit board. And so it fell off.

the .25" shrinkfit works perfectly, even without heating. Now to find a cheap 90degree angle that is .25" OD.

Remember that the SDS spec sheet calls for [gravity] fan side down. Remember that the spec allows a fairly long tube but they suggest black, which absorbs light. I have not exceeded 10cm tubing length.

I use aquarium tube. I heat it up using my hair dryer which makes it easy to put it on the SDS011.

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that’s probably preferred to shrink tube. can you get 90 degree elbows? thing is, SDS factory instructions say mount fan down, horizontally. The tube should be black to reduce light but - probably doesn’t matter.

Haven’t tried,but I think this should be possible. Then make sure while bending that it stays open.

ahhh. black tees and wyes are available. i think the constriction (smaller ID) is not a problem as the mfg guide says 6mm ID hose up to 1m.

Lukas recommends a /woman’s/ stocking as a filter.

Weird. I get An Amazon ad about aquarium tube

If you use the pipe houding a filter like a stocking of bug screen is not a bad idea.
This is my housing for my meter.

No problems with bugs but Doreen, the daily pigeon likes to sit on it.
The housing is 3D printed.

I have built about 34 of these, maybe 15 enclosures of this type which have the schnauz (nose). I think it is important to separate inlet and discharge. This has a course inlet filte on the PVC, and a fine filter on the tube. Purple air has them within 1cm. Probably in the end doesn’t make much difference on this grade of equipment. I have upgraded all of the sytems to BME280 - but most are on a bench now and i need to distribute them.

The other thing i read was that the fan on sds goes down (read instructions - gravity down). I think this is to keep particles moving through the chamber thus increasing the life (average 3 years) of the SDS.

The SDS is a venerable sensor. It’s used widely in commercial equipment. The Plantronics PM2.5 family has a minute air flow capacity, tiny laser chamber, and no inlet hose capability. Perhaps the small fan size dictates not allowing external tubing.

fun fun fuN!

model A red

Cool enclosure!
I have built about 30 sensors with the sds011 and the bme280. The sds’s still work, but I had a few nodemcu ‘s that failed after some time.
At the moment I only build combineert meters with the noise meter.I just started using the sensirion.

I am also soldering my own microphones. That’s quite a challenge.

what do you need to add to airRohr to sense sound? I don’t know if their mapping system even handles sound. Would you consider selling mic assemblies? Also, what continent are you on? I am in California.


For the sound meter you need to check out the github from hbitter. You need a Teensy 4.0 and the usual NodeMCU 3.0. I live in the Netherlands in Europe.

I might consider selling mems microphones as soon as I am more skilled at making them. Helmut Bitter , the German developer of the sound meter will be very pleased if his meter will be used in the USA as well. I have email contact with him and have received some microphones to test from him.
This is the link where my sensors are at.


impressive! i am overwhelmed with other projects right now. interestested in doing sound next year sometime. i still have parts for ten airRohr that i should finish assembling.

Cool! Are you going to use the dht22 sensor for temperature and humidity or the bme280 that can also measure air pressure?

Tomorrow I am going to solder new microphones on the printed circuits. Hope I can get some more working.

would be good to have a regimen for testing and calibrating. one of the products offered sensors that could be removed with a simple click, and sent in for factory recalibration. - dave

As a matter of fact I do have ways to calibrate my meters. I have several friends who are sound experts. And the RIVM, a Dutch government institute that does a lot of things, including sound measuring, is going to test two of my meters.

A couple of months ago one of my meters has been tested in a sound lab. I have the official test report and the sensor community meter came out very good.

I work in a company which is famous for gas analyzers and we use mostly Festo tubes.