I've just gotten some soil moisture sensors and finally gotten them to work with my PIC microcontroller. I had some difficulties at first in getting the I2C interface to work correctly. I slowed the interface bit rate down, though, and that seemed to help. What is the maximum practical bit rate that can be used for the I2C interface?
I've changed the base address correctly on one of the sensors so I can have two boards active and monitoring two different plants. I would like to have a visible way to see if the board is being accessed by the microcontroller when it is doing a reading.
Is there a method of accessing the sensor board's LED through the I2C interface? I didn't see anything in the register descriptions.