We designed a new revision (Revision 1) of the base station over break. Improvements include: better mechanical design and therefore higher reliability, higher efficiency power supply, more compact footprint, higher precision/accuracy sensors, and tons of other little adjustments. We assembled one 2 weeks ago and it powered up and functioned great after fixing a little glitch with the board design. With the testing done so far, everything is performing as expected, in fact the power supply is actually running smoother than designed. We are currently working on writing some preliminary versions of the software that runs on the board. This will allow us to evaluate the performance of the sensors and hopefully get a full prototype of the system up and running.
Just this past Thursday, we deployed our first prototype sensor package in the field at the Howard University – Beltsville research site in Beltsville, MD. Unfortunately, due to a communications issue we don’t yet have any data but hope to have this resolved soon. This location is home to air quality research instruments owned by Howard University as well as the Maryland Dept. of the Environment. (MDE)
Here is preliminary view of what our instrument will look like!
The outside is a radiation shield which provide protection from the sun and all other weather. It is specially designed to allow for proper ventilation for the most accurate measurements. It has louvers or angled shutters to keep air flowing and anything else out.
We are going to use a 3D printer to make each piece of the radiation shield and assemble it by stacking them on top of one another.
Inside the shield, there are two components, a battery in yellow and the base station assembly in blue and red. The base station assembly has a housing, inside of which is the Raspberry Pi (blue). The Printed Circuit Board (PCB) is in the middle (red) and the CO2 sensor on the top (red). There are also two satellite boards in blue on the walls which have more sensors on them such as temperature and humidity.