Internet of Things with Arduino - Internet of Things with Arduino - page 2

1.1 Hardware & Software Requirement

For this project, you will first need an Arduino Uno board.

For temperature and humidity measurements, you will also need a DHT11 sensor, along with
a 4.7K resistor. You can also use a DHT22 sensor which is more precise, you will only have
one line of code to change.

For light levels measurements, I used a photocell with a 10K Ohm resistor. This will return
a signal which is proportional to the ambient light level.

Then, you need the CC3000 chip for WiFi connectivity. There are many different board for
this chip on the market. What I recommend is using the Adafruit CC3000 breakout board,
which is the only one I tested that worked without problem. It is nice and compact, has
voltage regulators onboard (so you can connect it directly to your Arduino board), as well as
an onboard antenna.

Finally, you need a breadboard and some jumper wires to make the connections between the
different parts.

This is a list of all components used in this project, along with links to purchase them online:

• Arduino Uno ( http://www.adafruit.com/product/50 )

• DHT11 sensor with 4.7K resistor ( http://www.adafruit.com/product/386 )

• Photocell ( http://www.adafruit.com/product/161 )

• 10k Ohm resistor ( https://www.sparkfun.com/products/8374 )

• CC3000 breakout board ( https://www.adafruit.com/products/1469 )

• Breadboard ( http://www.adafruit.com/product/64 )

• Jumper wires ( http://www.adafruit.com/product/758 )

One software side, you will need the library for the DHT sensor: