Soil Moisture Sensor
For I2C Soil moisture sensor
The documentation for the I2C interface to this device was very sparse. It took much experimentation to finally get the device to work with my system. Several attempts at communication with the vendor concerning details were left unanswered. In asking the forum the specific questions regarding the interface and how to access the board's LED through the interface, I did get responses but none were helpful. None of the responses addressed the issue of accessing the board's LED.
The board's construction was very good, though, with the exception of the edges of the PCB designed to go into the soil. Nothing was done to prevent moisture from leaching into the edges of the PCB over time. I had to put a light coat of paint on the edges of the PCB to seal them against moisture. This could have been done by the manufacturer.