We are still shipping! However, order processing may take longer than usual and we cannot guarantee same day shipments due to staffing guidelines from the CDC. Please see all COVID-19 updates here. Thank you for your continued support.
Track My Order
Frequently Asked Questions
International Shipping Info
Mon-Fri, 9am to 12pm and
1pm to 5pm U.S. Mountain Time:
Chat With Us
August 2, 2010
about 3 years ago
I have been using this sensor for about 3 months. The a/d converter is 1024 counts for full scale (3.3V) and I calibrated by taking a sample of my garden soil, weighing it dry then adding water to saturation. As the soil dried, I weighed the container and recorded the adc counts and the weight. I found that the sensor output curve flattens at low water values and high water values but is pretty linear in the range 800 - 880 counts (2.6 - 2.8 ).
In the Garden, the probe is powered only a few microseconds once each minute so I have not observed any corrosion issues.
From observation, it appears that the sensor output is also dependent on temperature (lower voltage for cool temperature; higher for warm). Consequently my garden generally gets watered near dawn when the temperature is lowest.
Has anyone else noticed this dependency? or have any temperature data?
No public wish lists :(