Description Unit Earth is a soil moisture sensor used to collect moisture data from soil or similar materials. It uses two measurement probes inserted into the soil; because higher moisture content improves conductivity, the potential difference between the two probes is measured, converted by ADC, and sent to the M5Core. The unit integrates a 10K adjustable resistor for detection threshold adjustment and supports both analog and digital output, making it suitable for potted plant moisture monitoring and simple soil humidity detection projects. Features Soil moisture detection through two measurement probes Integrated 10K adjustable resistor for threshold adjustment Analog and digital output HY2.0-4P Grove interface Supports UiFlow and Arduino development 2 x LEGO-compatible holes Specifications Specification Parameter Sensor Type Soil moisture sensor Output Analog output, digital output Threshold Adjustment 10K adjustable resistor Interface HY2.0-4P Grove Product Size 64.3 x 24.0 x 8.0mm Product Weight 5.0g Package Size 138.0 x 93.0 x 9.0mm Gross Weight 10.0g Interface Uses HY2.0-4P Grove connection Provides digital output and analog output Designed for PORT.B connection Applications Potted soil moisture monitoring Plant watering reminders Soil humidity detection experiments STEM and Arduino moisture-sensing projects Product List 1 x Unit Earth 1 x HY2.0-4P Grove Connection Cable (20cm) Other Content The electrodes of this module are not corrosion-resistant or waterproof and are intended only for proof-of-concept use. Do not leave the probes in a humid environment for an extended period. Resources Official Documentation Unit Earth Schematics PDF Unit Earth Structure Files Unit Earth Test Example UiFlow1 Documentation UiFlow2 Documentation Unit Earth Test EasyLoader Official Product Video EARTH Tutorial Video FAQ What does Unit Earth measure? It measures soil moisture by detecting conductivity between two probes inserted into the soil. Does it provide analog output? Yes. Unit Earth supports both analog and digital output. Can the detection threshold be adjusted? Yes. It integrates a 10K adjustable resistor for threshold adjustment. Is the probe waterproof or corrosion-resistant? No. The electrodes are not corrosion-resistant or waterproof and should not be left in humid environments for long periods. What is included in the package? The package includes 1 x Unit Earth and 1 x HY2.0-4P Grove connection cable.