last highlighted date: 2024-06-17
Highlights
- Recent examples include the Garduino system, and the twitter-enabled Botanicalls. Both these systems rely on the fact that the resistance of earth that contains water is lower than the resistance of earth that contains less water. This works, but it has two important drawbacks.
- Note: examples of soil moisture
- make sure the isolation (soldermask) on the sensor is really waterproof, I’m performing an extended soak test. In order to be usable the sensor needs to have a resistance that is at least an order of magnitude larger than the discharge resistor in the measuring system