So, this is an update on the PCB that we’ve set up.
Essentially, this PCB utilizes the following circuit diagram (this circuit diagram comes from the original AirPi project):
So our modification to this design is to utilize the GPIO pins on the Arduino Galileo. Basically, on this diagram, all of the RPi# pins can be replaced with Galileo# pins in order to understand our circuit diagram.
Our circuit utilizes an 8-bit ADC in order to take in signals from a photoresistor, an air contaminant sensor, an NO2 (Nitrogen Dioxide) sensor, and a CO (Carbon Monoxide) sensor. In order for our Galileo to be able to properly interpret the data, the analog signals from this sensor are then converted to digital signals that can easily be interpreted and used to accurately display the relevant information that is sensed for the users to understand.
Our Temperature and Pressure sensor works independently, as it can be seen on the top, as it outputs digital data that we can take in straight to the Galileo and interpret it accordingly.
This is just a schematic of the overall design, and we will be implementing it onto a PCB, which I will upload very soon. I have already put on the major pieces, but need to add on the smaller scale components (resistors capacitors) to insure proper current flow and voltage drops throughout all of the components in this system.
A picture of the finished Hardware Component will be uploaded within the week.
**For an understanding of the PCB for this, you can see a mock-up included with the AirPi schematic at: http://123d.circuits.io/circuits/18876#schematic**