As of now, the greenhouse sends out tweets on its own account: @SageBySindono. It will tell the world when it gets too hot or cold for the plants inside (currently strawberries, watermelon and red peppers), or when the soil gets dry or is too wet.
To send the messages, the pachube feed is used. Pachube offers a feature called “triggers” that allow the owner of the feed to setup a call to a URL when the value of a datastream meets certain criteria. For example: the greenhouse’s temperature datastream has two triggers setup: one if the temperature gets below 10C and one if the temperature gets above 30C. When those criteria are met, a PHP script is called. The script reads the data values and sends a tweet on behalf of @SageBySindono
In its current form, this is pretty basic and we consider it to be a proof-of-concept. But, if succesful, future versions could be more elaborate. A lot can be done within the PHP scripts with the values from the datastream.
We plan to do a writeup on how to twitter values from your sensors using Pachube triggers somewhere in the near future, so you too can setup something similar for your project.
Until then, follow @SageBySindono to see what is possible.
