door and copper

Hi Agata,

It's not temperature that the computer is measuring but electrical conductance - I only used temperature as an analogy as electrical conductance is a difficult concept to visualise. I suggest that you look at the links below as they provide an excellent guide on how the sensor works.

Here is the link to the arduino software library that I suggest we use:
playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense
The link explains exactly what is going on and how the system is able to detect when someone touches the door.

Here is another link which goes through step-by-step how to build one of these sensors. It also explains exactly what's going on in more detail.
www.instructables.com/id/How-To-Use-Touch-Sensors-With-Arduino/

Here is a video showing the performance of the system in action:
www.youtube.com/watch?v=BHQPqQ_5ulc

Please read these to familiarise yourself with exactly what's going on. When I see you tomorrow, I can answer any questions you may have.

See you tomorrow and thanks for the post,

C