This walk-through will show you how to build a sensor to monitor your plant's environment and use Stats in Sound's ERC-20 app to turn this data into music, allowing you to listen to your plant's reaction to it's environment.  For more information on this project, please visit www.statsinsound.org.uk. Below is a sample of music generated by the ERC-20 app, monitoring a happy healthy chilli plant.
You will need some basic experience with soldering, breadboarding and using the Arduino platform for this tutorial.

This particular instructable is for a sensor that will upload it's data via an Ethernet connection. Your plant will preferably be indoors. It's a bit cheaper and easier than the WIFI version, but if you're feeling adventurous, you can check out the WIFI version here.

To build a plant sensor, you will need the following:

] 1 x Arduino Ethernet
] 1 x FTDI > USB cable
] 1 x Ethernet Cable (Cat 5E patch)
] 1 x DHT22 Temperature + Humidity sensor
] 1 x LDR (Light dependent resistor)
] 2 x 10Kohm resistors
] 2 x Nails  (Any nails will do for now, galvanized is best though)
] Plenty of hook up wire (single core wire)
] A Soldering iron & plenty of solder
] A Mac or windows computer

We have provided links to some of the trickier parts to find.

Once you think you have everything, you can continue to the next step to get started!

Step 1: Connect up the DHT22

The DHT22 is a great temperature and humidity sensor for projects like this because it's pretty accurate and very cheap.

Here's a few specs:

- 3 to 5V tolerant
-  Good for 0-100% humidity readings with 2-5% accuracy
- Good for -40 to 125°C temperature readings ±0.5°C accuracy
- No more than 0.5 Hz sampling rate (once every 2 seconds)
- Body size 15.1mm x 25mm x 7.7mm

There are four pins but only three are used as follows:

1- Power
2- Data
3- GND
4- N/A

So we just need to connect the Arduino 5V to pin 1, Arduino digital pin5  to pin 2 and GND to pin 3.  Check the picture for the pin numbers.

As far a reading the data goes, there is a library included with the files in this intractable that will sort that out for you.

this sounds very interesting but I'm a little confused about what the final product is like. Do you have a video that shows the types of sounds you might hear, how does the algorithm work?
The WAV file on the first page shows an example of the music. The algorithm takes all the data and compares it with ideal values for most plants and comes up with a rough level of respiration, transpiration and photosynthesis. These elements are reflected in the music along with any extreme conditions, such as too hot, too cold, too wet etc, so you can identify the problem. It is an art project though, so is not 100% accurate, but a representation. <br> <br>You can read all about the project here: <br> <br>http://statsinsound.org.uk

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More by mattomatto: Hear your plant make music! - Ethernet version Hear your plants play music!  (WIFI version)
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