Soldering

By RaggedStaff

Using a moisture sensor, an Arduino, and a valve we document how to create a simple, battery powered, irrigation controller.

By knarc

This is a wireless, solar powered chicken coop sensor that measures ambient temperature and relative humidity inside of a chicken coop. It is made out of the internals of the soil/garden sensor that I posted here.

By sam_uk

Growerbot creates open-source soil sensors and automated watering systems that make it easy for anyone to grow more with less work. Solar-powered, wirelessly-connected, and tightly coupled with software,

By kinasmith

Compost Sensor is an open source sensor system for monitoring and recording the temperature and moisture of active compost. It is for small scale commercial composting operations to help with quality control and the certification processes. http://www.instructables.com/id/Compost-Sensor/