We have 5 units in our Sydney Warehouse available for immediate dispatch.
Description
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
Learn
Example
1. Arduino IDE
The code below is incomplete. To get the complete code, please click here.
#include <M5Stack.h>
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.
More information
Schematic
PinMap
| M5Core(GROVE B) | GPIO36 | GPIO26 | 5V | GND |
| EARTH Unit | AnalogSignal Pin | DigitalSignal Pin | 5V | GND |
