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This is a summary of the soil moisture sensor that can be used to detect moisture, when the soil is dry, the module outputs a high level. Use this sensor to build an automatic watering system.
Specifications:
Operating voltage: 3.3V~5V.
Adjustable sensitivity (blue digital potentiometer adjustment)
Dual output mode,analog output more accurate.
A fixed bolt hole for easy installation.
Power indicator (red) and digital switching output indicator (green).
LM393 comparator chip, stable.
PCB Dimension: 3cm x 1.5cm.
Soil Probe Dimension: 6cm x 2cm.
Cable Length: 21cm.
VCC: 3.3V-5V.
GND: GND.
DO: digital output interface (0 and 1).
AO: analog output interface.
Setup with Raspberry Pi
Package Includes:
1 x Soil moisture detector module
1 x Probe
5 x Jumper Cables
The item is for use as a rain sensor, monitoring can be used for a variety of weather conditions, and converted into the number of the reference signal and the AO output.
The sensor uses FR-04 high-quality double-sided material, King Size 5.0 * 4.0CM, and with a surface of nickel plating treatment against oxidation for superior performance and longevity;
The output is in the form of digital switching outputs (0 and 1) and analog AO voltage output;Sensitivity can be adjusted via the potentiometerLED lights up when there is no rain, output is high.
Specifications:
Small board PCB size: 32mm x 14mm
Operating voltage: 3.3V-5V
How to use:
Connected to 5V power supply, the power indicator will light up.
With no water droplets, DO output is high, LED turns off.
Dropping on a drop of water, DO output is low, the indicator light switch on,Brush off the the above water droplets, has returned to output high state. . . .
Connection mode:
1, VCC: positive power supply (3-5V)
2, GND: negative one.
3, DO: TTL switching signal output
4, AO: Analog signal output
Package includes:
1 x Rain sensing board
1 x Control board
5 x 20cm Dupont Line
Resources:
Magpi example
When the soil moisture is lower than preferred setting, the relay will automatically pull in, start the sprinkler, water pump etc. until the moister reaches the desired humidity level and automatically stop.
Product use: Through the potentiometer, adjust to the desired soil moisture level
Specifications:
Electrical parameters: Supply voltage: 12VDC
Input current: more than 100mA Relay Load Max: 10A 250V AC or 10A 30V DC
Module instruction:
1 sensors applied to the detection of soil moisture; Module
2. Blue potentiometer is used to adjust soil moisture level, clockwise adjustment and control the humidity will be bigger, counterclockwise smaller; 3. Due to module delay function, adjust the humidity value, wait about 5-8 seconds, see if the the relay state changed, the green LED lamp will also have corresponding change, until adjusted to meet the requirements.
Package Includes:
1 x Soil moisture control module
1 x Soil sensor
2 x 20cm long DuPont lines
Description:
Maker Soil Moisture Sensor measures soil moisture by capacitive sensing, where the presence of water in the soil will increase the probe capacitance. The output of the sensor is analog output; higher moisture levels will produce lower output voltage. Being part of the Maker Series, the sensor is equipped with many features to further simplify digital making for beginners and experts alike.
The Maker Soil Moisture Sensor is easy to use. It only needs a power supply, if the LED indicators alone are enough for your application. Make sure that the voltage level of the power supply is within the sensor specifications. Note that the LED indicators only indicate approximate moisture levels and might fluctuate depending on the power supply, since the sensor does not have a voltage regulator on board.
Full Tutorial: Battery Powered Maker Soil Moisture Sensor

Full Tutorial: Self Watering Pot Featuring Maker Soil Moisture Sensor
Features:
Operating Voltage: 2.5V - 7.0V.
Output: Analog Voltage (Higher moisture = lower voltage)
Grove port.
LED indicators for dry/moist/wet soil moisture levels.
Soil Limit (Maximum depth of the probe)
Double-sided probe (More sensitive to moisture changes)
Capacitive sensing probe (Corrosion resistant)
Disable pin (Power-saving application)
Example Applications:
Soil moisture detection
Automatic Plant Watering System
Smart/IoT Gardens

Resources:
What's in the box?
1 x Sensor
1 x 50 cm Grove cable
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