In this project, we will build a thermometer and a humidity sensor using an Arduino Uno and the AM230. This device will write the recorded data to the Raspberry Pi and store it in our control database.
Once we have this system up and running, we will look at some ideas on how we can expand the damp detection system to use the Cooking Hacks shield.
Let's start with building the Arduino circuit.
Our damp detection system is scalable, so we can build multiple damp detection units, and place them in separate locations such as the shed and the basement.
The Arduino thermometer/humidity circuit is the same as what we built for the thermostat. The following diagram illustrates it:
Building the circuit is simple, and you should be familiar with it by now. Attach your Ethernet shield to the Uno and then simply hook up the AM2302 to digital pin 4, the 5V pin, and the GRD pin. This completes the device's setup.
Now that we have built the circuit, let's write the Arduino...