Shinyei PPD42NS particle sensor



  • Anyone tried to attach the Shinyei PPD42NS sensor to a Pycom device?
    It would be interesting to compare the results of this sensor with say a PMS5003 particle sensor on a Pycom device.

    It is a very cheap sensor that can be used to measure air quality in a crude way.

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    More info here and here.



  • 0_1497383994430_20170613_215443_HDR_klein.jpg
    Arrived in time for the hackaton this Saturday. :)



  • @RobTuDelft Hi Rob, if you want the added info of particle size, you really do need to monitor both PWM outputs, but if you only plan on monitoring a single pin, then monitor the small particles pin.

    I do take the duration of low pulse width on each pin into account too, at a resolution of 1ms.
    The Amphenol sensor that I am using, I have noticed does not produce pulses narrower than 1ms



  • @Shaun The pulse width is also an indicator for particle size. So you could add counters based on the pulse length even with just one PWM output. Something I will test later.



  • I have been running a unit for a couple of weeks now.
    I hacked it onto an existing application PCB I developed around a WiPy.

    The unit I use has 2x PWM outputs, one for larger particles and one for smaller particles

    I am displaying real time readings, an exponential running average and a resettable peak hold.

    0_1496567840949_20170604_110438.jpg



  • @RobTuDelft not just different nane, but also different price. I ordered 2 for €8,88 incl. shipping via AliExpress.
    The grove connector is nice for the Marvin though.



  • Fyi, I'm using a LD1117A voltage regulator on the digital PWM input signal. It drops it from 4.5V to about 2.5V, which is enough for it to be a high signal on the Lopy.

    My readings are around 400 pcs/0.01cf in the office.

    I have resolved a few bugs in the code, so be sure to use the latest version from my Github.

    @PiAir did you know you can also order them in the Netherlands under a different name?



  • @PiAir Sure, will bring it :)



  • Cool, nice to collect other data than just temperature and humidity. I ordered one (two) from AliExpress, probably won't be here in time for Eindhoven, but maybe you can bring your setup and demonstrate it then? :)



  • I have created a library for this particulate matter sensor based on the Arduino code if anyone is interested.
    You can find the code here.

    Sensor needs to be connected to 4.75 - 5.25 V and you need to drop the voltage for the input port.

    If you have any comments or questions let me know.


 

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