ESP8266 Community Forum

Hi,

I recently bought a Nova SDS021 dust sensor. It measures particles of 2.5 and 10 nmeter.
It works by sending both measurements over a 3.3v uart connection.

Only software I could find was a library that worked fine at https://github.com/ricki-z/SDS011.
But this library does not cover all possibilities, especially the sleep mode as documented in
the manual (https://github.com/gitpeut/cdn.sparkfun.com/assets/parts/1/2/2/7/5/Laser_Dust_Sensor_Control_Protocol_V1.3.pdf).

So I wrote a library that covers the whole manual.
It can be found here:

https://github.com/gitpeut/SDS021

As far as I know everything works as expected.
Have fun
Jose

Hi, while i wanna use the example code SDS021_querymode from your library SDS021-master, i cannot run it, arduino says 'class HardwareSerial' has no member named 'printf'. Do you know how to solve it?

Hi,
My guess is you are using an AVR microcontroller. Arduino does not support printf out of the box for these
microcontrollers.
You can enable it, as described here :
https://playground.arduino.cc/Main/Printf

Replacing printf in the library is not easy as I have used it extensively.

Sorry.

Hi,

My guess is you are compiling this not on an ESP8266, like I used to develop this library.
I forgot that on many processors, printf is not enabled by default.
I have used printf extensively throughout the library and the examples, itquite some work to remove it
from the library.
For now, your best bet is to have a look at the following page and follow some of th einstructions to
enable printf in Arduino:

https://playground.arduino.cc/Main/Printf

I will have a look in a week or so to remove printf or make it conditionally being used.

Good luck.