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Adafruit Stemma Soil Sensor - I2C Capacitive Moisture Sensor

Brand: Adafruit
  • This design is superior than your average soil sensor with a capacitive measurement
  • This design only requires one probe
  • Doesn't have any exposed metal
  • Won't introduce any DC currents into yout plants
  • Works with just about any microcontroller thanks to the I2C connection
Brand: Adafruit
Manufacturer: Adafruit
Part Number: QH7RXBL
Material Type: Metal
Isin: IY1GSR8PCKNO

$38.53

  • Free shipping in US
  • Shipping: $14.5 Extended Delivery (Ships from overseas warehouse, 10-15 Business Days)
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Adafruit Stemma Soil Sensor - I2C Capacitive Moisture Sensor

Adafruit Stemma Soil Sensor - I2C Capacitive Moisture Sensor

$38.53

Most cost-effective floor sensors are resistant where there are two prongs and the sensor measures the conductivity between the two. These work fine at first, but eventually they begin to oxidize due to the exposed metal. Even if they are gold-plated. Resistance measurement increases and rises so you have to constantly recalibrate your code. So resistance measurements do not always work in loose soil.

This design is superior with capacitive measurement. Capacitive measurements use only one probe, have no exposed metal and do not introduce direct currents into your plants. This sensor uses a built-in capacitive touch measuring system built into the ATSAMD10 chip, which gives you a reading of about 200 (very dry) to 2000 (very wet). As a bonus, it also gives you the ambient temperature from the internal temperature sensor on the microcontroller, it is not high precision, maybe good up to + or - 2 degrees Celsius.

So that you can use the sensor with almost any microcontroller, it has an I2C interface. Connect a 4-pin JST PH cable to your microcontroller or single board computer to 3-5V current, ground, I2C SDA and I2C SCL, then run the included Arduino or CircuitPython code to read the temperature and capacitive measurement. No soldering required!

Please note: this is the sensor only, you also need a JST 4-PH cable to plug in

 

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