La mayoría de los sensores de suelo de bajo costo son de estilo resistivo, donde hay dos puntas y el sensor mide la conductividad entre los dos. Estos
Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture Sensor
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Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture Sensor [JST PH 2mm] : ID 4026 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Sensor de humedad del suelo DFRobot SEN0114
METRO board and 4-pin JST-PH cable shown is NOT included p Most low cost soil sensors are em resistive /em style, where there's two prongs and the sensor measures the conductivity between the two. These work OK at first, but eventually start to oxidize because of the exposed metal. Even if they're gold plated! The resistivity measurement goes up and up, so you constantly have to re-calibrate your code. Also, resistive measurements don't always work in loose soil.
Adafruit Stemma Soil Sensor - I2C Capacitive Moisture Sensor
Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture Sensor [JST PH 2mm] : ID 4026 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture - Project Guidance - Arduino Forum
4026 - Adafruit, Soil Moisture Sensor
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Kit del desarrollo del procesador y del microcontrolador, perno bajo microcontrolador de la cuenta - RS
Adafruit Industries STEMMA Soil Sensor - I2C Capacitive Moisture Sensor - Micro Center
Adafruit Industries - 4026 - Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture Sensor - RS