Hi alf,
some time ago I'm going to search information about dust sensors, I had found this article very instructive.
https://aaqr.org/articles/aaqr-18-10-lcs-0390
Bye Renzo
Posts made by Renzo Mischianti
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    RE: Dust sensor for high concentrationposted in General Discussion
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    RE: CNC PCB millingposted in General Discussion@NeverDie I use this steps, and I'm quite satisfied https://www.mischianti.org/2019/03/14/design-and-mill-pcb-easy-and-cheap-part-5/ Nothing special, but works correctly.. 
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    RE: CNC PCB millingposted in General DiscussionHi all, 
 I build my CNC, to do PCB, i started from an old project and I add some addiction and I create the electronic with limit switch probe etc.. 
  Here my tutorial to build 3D printed CNC 
 https://www.mischianti.org/category/tutorial/cyclone-pcb-factory-how-to-build-it/And Here the FlatCAM tutorial 
 https://www.mischianti.org/category/tutorial/flatcam-complete-tutorial/But my first CNC is in my heart  It's working, and I create a lot of PCB with that... It's working, and I create a lot of PCB with that... Naturally It's for home use, but I resolved a lot of situation with that. Bye RM 
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    RE: Power One Aurora Inverter RS485posted in DomoticzHi, I create a library with full documentation for this device and I'm going to release a complete web solution. https://github.com/xreef/ABB_Aurora_Solar_Inverter_Library Bye