For the wiring between the capacitive soil moisture sensor and the ESP8266, we can either use the 5V pin of the ESP8266 board or the 3.3V pin of the microcontroller, because the sensor is able to operate with both voltages. The ESP8266 reads the soil sensor value on analog pin A0.. Using a digital pin set to HIGH on an Arduino, for example, is an easy way to accomplish this.. c // SparkFun Soil Moisture Sensor and Serial LCD example 1 // By Sarah Al-Mutlaq 2015 // Sketch reads sensor and desplays level and whether soil is wet or dry // Use the softwareserial library to create a new "soft" serial port // for the display.

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To connect the soil moisture sensor FC-28 in the digital mode, we have to use digital output of the sensor and a digital input of Arduino. While monitoring the sensor gives us true or false condition with respect to measured moisture content in a soil. We can adjust the threshold using the potentiometer in the sensor.. This triggers the FC-28 soil hygrometer module to send an ultrasonic pulse to measure the soil moisture level. The duration of the echoPin response is measured using pulseIn(). The duration is then divided by 2 and divided again by 29.1 to get the distance in cm. If the distance is greater than or equal to 400 cm, it means the soil is dry.