AirGradient DIY Case

This is a replacement case for the AirGradient DIY air quality sensor that uses the v2 PCB. 

The biggest problem with these devices was that the temperature sensor was mounted directly on the PCB and would always read a few degrees high because of heat generated by other components. There was a “fix” for this that used a pokey outie thing that you put the temperature sensor in. It was always a bit ugly.

So I decided there had to be a neater way.

This case basically does the same thing except the temperature sensor is now in it’s own chamber within the case. Isolated air flows through vents on three sides. Testing seems to show that the temperatures are now pretty accurate. 

Solder the SHT sensor onto flying leads and simply slide the leads into the slot, leaving the sensor in it’s chamber. If you like you can tape or glue the wires. I didn’t as the slot is deliberately a snug fit. 

No-one seems to have the tiny screws to fasten the PM Sensor to the PCB, so I’ve designed it so it’s clipped into the case. This has the added advantage of ensuring there are no “short circuits” in the airflow between the air input and output. 

If you haven’t assembled your AirGradient yet, when you do, try to solder the Arduino in so that the display is at the same height as the PM Sensor. That way when you mount it in the case, the display will be neatly flush with the window and the USB socket will align properly with it's hole. 

The case itself is a simple two piece design that snaps together without needing any screws.