Import fritzing part into library9/25/2023 ![]() The sensor comes with a LM393 module that helps give out a digital or an analog signal. However, for our intended purpose - which is to simply notify the user if the plant needs watering - this sensor fits the bill. Thus, reading soil moisture through this sensor might not be enough for more complex applications or scientific researches. The type of soil and temperature are other factors that determine soil moisture. The sensor is designed as an electrode whose resistance varies with both the moisture and how deep it is plunged into the soil. Soil moisture is inversely proportional to its resistance, i.e., the higher the water content in the soil, the lower its resistance. The soil moisture sensor for this project is an inexpensive sensor that reads the resistance of the soil. But what if you forgot to water the plants? This multi-part tutorial aims to provide a simple soil moisture sensor that reminds you, via WiFi, that your flora needs a shower.
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