{"product_id":"adafruit-stemma-soil-sensor-i2c-capacitive-moisture-sensor","title":"Adafruit STEMMA Soil Sensor - I2C Capacitive Moisture Sensor","description":"\u003cp\u003eMost low cost soil sensors are \u003cem\u003eresistive\u003c\/em\u003e 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.\u003c\/p\u003e\u003cp\u003eThis design is superior with a \u003cstrong\u003ecapacitive\u003c\/strong\u003e measurement. Capacitive measurements use only one probe, don't have any exposed metal, and don't introduce any DC currents into your plants. We use the built in capacitive touch measurement system built into the ATSAMD10 chip, which will give you a reading ranging from about 200 (very dry) to 2000 (very wet). As a bonus, we also give you the ambient temperature from the internal temperature sensor on the microcontroller, it's not high precision, maybe good to + or - 2 degrees Celsius.\u003c\/p\u003e\u003cp\u003eTo make it so you can use the sensor with \u003cem\u003ejust about any\u003c\/em\u003e microcontroller, we have an I2C interface. Connect a 4-pin JST-PH cable (we have a few stocked) to your microcontroller or single board computer to 3-5V power, Ground, I2C SDA and I2C SCL and then run our \u003cstrong\u003eArduino\u003c\/strong\u003e or \u003cstrong\u003eCircuitPython\u003c\/strong\u003e code to read the temperature and capacitive measurement. No soldering required!\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePlease note: This is just the sensor, you'll also need a JST 4-PH cable to go along for plugging it in! \u003c\/strong\u003eWe have a few options such as one with male header pins, female header pins, and a JST-JST cable. You can use Seeed Grove cables and boards to connect - the Grove cable is a little different looking but will fit just fine.\u003c\/p\u003e\u003cp\u003eCheck out the full guide for schematics, wiring, code and more!\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003ch2\u003eTechnical Details\u003c\/h2\u003e\u003cdiv id=\"tab-technical-details-content\" class=\"panel-collapse collapse in\"\u003e \u003cdiv class=\"row\"\u003e \u003cdiv class=\"col-lg-12 col-md-12 col-sm-12 col-xs-12\"\u003e\n\u003cp\u003eRevision History:\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eAs on Jan 7, 2020 - We've tweaked the firmware to take more oversamples before returning a value. This gives a better range of values from soil moisture sensing.You may need to extend delays between reads.\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003eProduct Dimensions: 76.2mm x 14.0mm x 7.0mm \/ 3.0\" x 0.6\" x 0.3\" \u003c\/p\u003e\n\u003cp\u003eProduct Weight: 4.0g \/ 0.1oz \u003c\/p\u003e\n\u003c\/div\u003e \u003c\/div\u003e\n\u003cul id=\"product-files\"\u003e \u003c\/ul\u003e \u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-lg-2 col-md-3 col-sm-3 col-xs-4\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"col-lg-2 col-md-3 col-sm-3 col-xs-4\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e \u003c\/div\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":53697531543828,"sku":"old1787257929162","price":5.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/9486\/7220\/files\/adafruit-stemma-soil-sensor---i2c-capacitive-moisture-sensor_1.jpg?v=1787257933","url":"https:\/\/regalwearstore.shop\/products\/adafruit-stemma-soil-sensor-i2c-capacitive-moisture-sensor","provider":"My Store","version":"1.0","type":"link"}