wbp
New Member
Posts: 26
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Post by wbp on Oct 2, 2019 18:14:47 GMT -8
I got curious about the air quality sensor and did some digging. In particular I was curious about air flow, since all the AQ sensors I am familiar with (like PurpleAir) have fans, but this one does not.
Turns out the PPD42 uses a resistor that is heated to create air flow. For this to work, the sensor is supposed to be installed vertically, with the connector at the bottom. There are 2 vents. The open area in between the vents is supposed to be covered, opaquely.
I am working on a design for a new enclosure that follows these requirements. The easiest way to do this is to mount the sensor on the side of the box, rather than below, so I am going with that.
Will
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Post by topher2880 on Oct 3, 2019 4:48:36 GMT -8
Looking forward to seeing what you come up with So long as enough clearance, it wouldnt be too hard, with Sketchup, hey Phate?
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Post by SDL on Oct 3, 2019 14:34:13 GMT -8
Interesting. Looking forward to seeing it. I'm especially interested to see if we can keep it dry!
BP
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wbp
New Member
Posts: 26
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Post by wbp on Oct 3, 2019 14:49:50 GMT -8
Keeping it dry is also one of my concerns. To that end I rethought my placement of the sensor, and have decided to design a box for it that attached to the bottom of the box (like the original housing). This is probably also better for anyone who has already drilled a hole in the bottom of the box for the AQI sensor cable.
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wbp
New Member
Posts: 26
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Post by wbp on Oct 3, 2019 14:55:30 GMT -8
Here's a picture of the new box. It's two parts, you put the sensor inside and then snap the lid on. I may add rain deflectors over the intake and outlet windows...
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Post by SDL on Oct 3, 2019 15:22:02 GMT -8
This has real possibilities! I like it!
BP
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Oct 4, 2019 5:49:59 GMT -8
Files - Link - Wanna Try it !!!
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wbp
New Member
Posts: 26
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Post by wbp on Oct 4, 2019 8:20:30 GMT -8
All good things take time - I had to print several versions before I got the lid to snap on the way I wanted. All of my parts for the SkyWeather can be found on Thingiverse: www.thingiverse.com/thing:3883567And, here's a picture of the AQI housing with little rain deflectors added...
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Post by topher2880 on Oct 4, 2019 17:25:14 GMT -8
Ohhhhhh I like that Stevenson screen!!
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Post by SDL on Oct 6, 2019 16:21:16 GMT -8
This looks great all across the board. We have no ego, we will recommend whatever works better!
wdp, how about printing a summary sheet of all your new pieces with pictures? Or better yet, give me a guest blog entry!
BP
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wbp
New Member
Posts: 26
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Post by wbp on Oct 7, 2019 12:13:32 GMT -8
I'm putting all my mods up on Thingiverse, with pictures. There is description of them and a place for comments there. Not sure what you mean by a "guest blog entry"?
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Post by SDL on Oct 9, 2019 11:59:55 GMT -8
Write up a description of your 3d prints and why you chose what you did. Give some installation instructions and a parts list of what you need. I'll get John to publish it both on the product page and in his blog, www.switchdoc.comBP
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wbp
New Member
Posts: 26
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Post by wbp on Oct 12, 2019 18:01:34 GMT -8
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