M5Stack Soil Moisture Sensor Unit

The Earth Unit from M5Stack measures the moisture in soil or similar materials. The two electrodes are inserted into the soil: the wetter the soil, the better it conducts and the higher the voltage at the analog output. There is also a digital output whose switching threshold can be set with the potentiometer.

According to M5Stack, the electrodes are neither corrosion-resistant nor waterproof and are only intended for experiments. For permanent measurement in a pot, the M5Stack Irrigation Unit with Soil Moisture Sensor and Pump with a capacitive sensor is the better choice.

Recommended Accessories:

• M5Stack M5GO IoT Starter Kit V2.7
• M5Stack Grove2Dupont Conversion Cable 20cm 10pcs
• 50cm M5Stack Grove Cable 2 Pieces

Features:

• Analog output and digital output
• Switching threshold of the digital output adjustable with the 10 kOhm potentiometer
• Electrodes are not corrosion-resistant or waterproof, do not leave them in a humid environment for long periods (M5Stack)
• Connects to Port B. The Basic Core itself only has Port A, Ports B and C come with the M5GO base, for example in the M5GO IoT Starter Kit V2.7
• 2 mounting holes for snap pins or screws

Application Examples:

• Monitoring the moisture of potted plants
• Indicator or alarm when the soil is dry
• Getting started with analog measurements in UIFlow or Arduino

Documentation:

• M5Stack documentation Unit Earth
• Arduino example by M5Stack (GitHub)

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U019
• Connection: Grove HY2.0-4P, Port B (GPIO)
• Pinout: black GND, red 5V, yellow digital output, white analog output
• On the M5Stack Basic: yellow G26, white G36
• Dimensions: 64 × 24 × 8 mm
• Weight: 17 g

Scope of Delivery:

• 1× M5Stack Soil Moisture Sensor Unit
• 1× Grove cable 20 cm
• 1× storage box