U019

Earth Moisture Unit SKU: U019 EARTH unit is a Soil Moisture Sensor for measuring the moisture in soil and similar materials. The soil moisture sensor is pretty straight forward to use. The two large exposed pads function as probes for the sensor, together acting as a variable resistor. The higher moisture that is in the soil means the better the conductivity between the two so that the sensor will result in a lower resistance, and a higher SIG out. You can read the moisture in soil by ADC. Inside this Unit we put an extra potentiometers to change the measurement range. Product Features • • • • Adjustable threshold, including 10K adjustable resistor Analog & Digital output Program Platform: Arduino, UIFlow(Blockly, Python) Two Lego-compatible holes Kit includes • • 1x EARTH unit 1x GROVE Cable Application • Potted soil moisture monitoring Example 1. Arduino IDE The code below is incomplete. To get the complete code, please click here. #include void setup() { M5.begin(); dacWrite(25, 0);//disable the speak noise pinMode(26, INPUT);// set digital pin } uint16_t analogRead_value = 0; uint16_t digitalRead_value = 0; void loop() { analogRead_value = analogRead(36);// read analog value of EARTH digitalRead_value = digitalRead(26);// read digital value of EARTH } 2. UIFlow To get the complete code, please click here. Schematic PinMap M5Core(GROVE B) GPIO36 GPIO26 5V GND EARTH Unit AnalogSignal Pin DigitalSignal Pin 5V GND https://m5stack.com/collections/m5-unit/products/earth-sensor-unit/12-99-19