This is a must have tool for a connected garden! In practice some of that range is lost however shouldn’t matter. It’s a low tech sensor, but ideal for monitoring an urban garden, or your pet plant’s water level. Water content can be calculated from water potential data using a soil moisture release curve, and the TEROS 21 can be backfilled or packed in. Based on your sample data I suspect yours is a 10-bit signal from 0-1023, so 800 range means the soil is quite moist. To connect the soil moisture sensor FC-28 in the digital mode, we will connect the digital output of the sensor to the digital pin of the Arduino. In practice some of that range is lost however shouldn’t matter.
In general, the specs for the sensor will inform you on what kind of signal to expect. This moisture sensor can read the amount of moisture present in the soil surrounding it. In theory the full range for an arduino based soil moisture sensor is 0 to 1023. TEROS 10, 11, or 12 soil moisture sensors used with the installation tool is our unanimous recommendation for difficult soils. There's very little deviation when all connections are secure and the soil moisture is evenly distributed. The threshold value is then compared with the sensor output value using the LM393 comparator, which is placed on the sensor module. The addition of soil moisture sensors allows for farmers to access soil moisture data from farms in their region. The sensor module contains a potentiometer, which is used to set the threshold value. If a soil is too rocky or hard for good soil to sensor contact, think about using the TEROS 21 water potential sensor. These sensors are placed near existing weather stations in a variety of crops, and the information collected will allow growers to track soil moisture and become familiar with how to interpret the data to make irrigation decisions.