Unstable output from HPMA115S0

Other Hardware Sensors
1

hy, im using HPMA115S0 with arduino mega. but the output from sensor always have interval 2 between PM2.5 and PM10. and then otherwise the resulting value cannot be stable. im using library from felix galindo. can anyone explain?

2

I also use HPMA115s0, but the value generated by the sensor is very irregular. I use the same library from felixgalindo. but the value is not stable and can jump to hundreds. can you help me to overcome it?

3

I've deleted/merged your cross-post(s) @boy_holmes.

Cross posting is against the rules of the forum. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend 15 minutes (or more) writing a detailed answer on this topic, without knowing that someone else already did the same in the other topic.

Repeated cross posting will result in a suspension from the forum.

In the future, please take some time to pick the forum board that best suits the topic of your question and then only post once to that forum board. This is basic forum etiquette, as explained in the sticky "How to use this forum - please read." post you will find at the top of every forum board. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

Please don't hijack threads! I've had to split your post out to its own thread.

This is basic forum etiquette, as explained in the sticky "How to use this forum - please read." post you will find at the top of every forum section. It contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

4

It sounds like you are powering the sensor from the arduino, this is a bad choice as this unit (from the data sheet I found) draws about 80mA but it is not a steady state load. Since the Vref is powered from the 5 volt system on the board. The variations of the load will cause minor variation in the regulator output. Try a separate power supply for the sensor. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil