Datasheet

The sensors

We'll use two basic sensors to log data, a CdS photocell to track light (http://adafru.it/161)

(this will tell us when the door has been opened) and a semiconductor temperature sensor

to log the ambient fridge temperature. (http://adafru.it/165)

We have two great tutorials for these sensors on our site, if you haven't used them before

or need some refreshment, please read them now!

Photocell tutorial

http://adafru.it/reg

TMP36 tutorial

http://adafru.it/reh

We will wire the sensors as shown in the diagram below.

Note that we connect ARef, the power pin of the temp sensor, and the light sensor to 3.3V