Loading

Particulates Sensor Case

by shred, published

Particulates Sensor Case by shred Feb 3, 2018

Design Tools

OpenSCAD

Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

953Views 72Downloads Found in Outdoor & Garden

Summary

Note: The white box is a stock junction box. It's not printed.


This is a frame for a luftdaten.info compatible particulates sensor.

The original sensor is housed in drain pipes, which is cheap, but also looks quite like that. ;-)

This construction uses an OBO Bettermann T60 junction box, which looks nicer, and is also UV resistant and IP66 water protected. All components are mounted on the printed frame and fixed inside the junction box. Two wind pipes at the bottom of the box allow air flow. A printed tunnel guides the inlet air to the sensor, so there is no need for a hose. Grilles in the wind pipes keep insects from crawling into the box.

A DHT22 temperature and humidity sensor is required for this construction. It is placed at the wall of the inlet air tunnel, so it is protected from rain, but still exposed to the outside air. There is a space for an optional BMP180 air pressure sensor.


Bauanleitung auf Deutsch (assembly instructions in German)

Print Settings

Printer Brand:

Ultimaker

Printer:

Supports:

No

Infill:

30%


Notes:

Use a material that allows to drive in screws without cracking. Since the printed parts are mounted inside the junction box, the filament does not need to be UV resistant or particularly weatherproof. I have used PLA.

No ambient light should fall into the chamber of the particulates sensor. For this reason I recommend to use a dark filament, at least for the top frame part.

Do not use supports, as they may be difficult to remove after printing.

Post-Printing

  • Remove both plug-in seals from one side of the junction box. This will be the bottom side later.
  • Insert the USB cable through the left hole.
  • Put the base plate into the junction box and tighten it with 4x 3.5 x 12 mm screws. You can also use 3.0 x 12 mm screws if you don't have 3.5 mm screws at hand.
  • Cut open the two plug-in seals at 19-20 mm diameter, and use them to seal the junction box again.
  • Solder the sensors and sensor cables to the NodeMCU. Use shrinkable tubing for the pins of the DHT22 sensor. Check that the wiring is correct. Check again.
  • You should install the sensor firmware and run a test now. It will be more difficult once the sensor is assembled.
  • Fix the NodeMCU and the optional BMP180 sensor to their bolts, using 3.0 x 12 mm screws. Connect it to the USB cable.
  • Insert the DHT22 sensor into its place (see photo). It does not need to be fixed.
  • Place the upper plate in its position and tighten it with 2x 3.0 x 12 mm screws.
  • Connect the SDS011 cable to the sensor. You may need to cut away a little bit of the connector's plastic to make it fit into the junction box.
  • Put the SDS011 sensor to the top of the sandwich. Be careful when inserting the air inlet into the printed air tunnel. Tighten the sensor with 3x 3.0 x 12 mm screws.
  • That's it. You can close the junction box now.

Bill of Material

Besides the printed parts, you need:

  • OBO Bettermann T60 junction box with plug-in seals
  • ILS-Nova PM Sensor SDS011
  • Lolin NodeMCU (make sure it's Lolin, other brands may not fit)
  • DHT 22 (temperature and humidity sensor)
  • 11 screws 3.0 x 12 mm
  • 4 screws 3.5 x 12 mm (if available, or four more 3.0 x 12mm)
  • Some ribbon cable
  • Some shrinkable tubing
  • USB cable with flat wire
  • USB power supply (a disused old USB charger will do, the sensor consumes less than 200 mA)

Optionally:

  • BMP180 (temperature and air pressure sensor)

More from Outdoor & Garden

view more

All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App
Top