Sensors

The sensors are a very imporant part of our project.
There are many types of sensors, but we choose three:
-Temperature
-Light
-Humidity

Our temperature sensor is a LM35cz (TO-92 package). It measures the temperature and produces a linear voltage.

For the light measurements we use a simple small LDR. The value coming from the voltage divider (LDR - resistor) is linked to four states: "Nacht", "Avond/Zw bewolkt", "Dag/L bewolkt", "Dag/Zonnig"

The Humidity sensor wasn't easy to find.
We tested many of them, but they all had problems. Finally we decided to use a HIH-4000 from Honeywell. This sensor produces also a linear voltage, just like the LM35.

All of our sensors were tested on the breadboard, now we are waiting for our final "Sensorshield" print!

Arduino as webserver.

To make the Arduino UNO with ethernetshield act as a webserver wasn't all that hard. There are more than enough examples on this subject. Then, what did we do that was worth mentioning on our blog?
We made a small website that implemented a chart that we made using Googlechart. Now when you typ in the arduino's ip address you we see our small website with the temperature graph.