• Adjustable sensitivity via potentiometer.
• Operating voltage: 3.3V – 5V DC.
• Dual output function:
  • Analog output for measuring the humidity level.
  • Digital output for activation/deactivation based on a preset threshold.
• Power indicator light: Red LED.
• Digital output indicator light: Green LED.

Suitable for:

• automatic irrigation systems,
• plant moisture monitoring,
• Arduino applications and DIY electronic projects,
• IoT agriculture and smart garden systems.

Guide for connecting a soil moisture sensor (Soil Hygrometer / Moisture Detection Module) with Arduino

Below is a detailed step-by-step guide for connecting a soil moisture sensor to an Arduino board.

Step 1: Required equipment

You will need:

• Arduino board (e.g., Arduino Uno)
• Soil moisture sensor (Soil Hygrometer / Moisture Detection Module)
• Breadboard (testing board)
• Connecting wires (Jumper Wires)

Step 2: Understanding the moisture sensor

The soil moisture sensor is an electronic unit that measures the moisture level in the soil.

It usually has the following pins:

• VCC: Power supply for the sensor.
  • Usually operates at 3.3V or 5V, depending on the model.
• OUT: Analog output that provides a voltage proportional to the moisture level.
• GND: Ground.

The output value varies according to the soil moisture.

Step 3: Connecting the sensor to the Breadboard and Arduino

1. Place the sensor on the breadboard so that its pins are in different rows.
2. Connect the sensor's VCC pin:
   • to the 3.3V or 5V pin of the Arduino (depending on the sensor's requirements).
3. Connect the OUT pin:
   • to an analog input of the Arduino, e.g., A0.
4. Connect the GND pin:
   • to the GND pin of the Arduino.

Step 4: Reading moisture level with Arduino

1. Open the Arduino IDE on your computer.
2. Create a new program (Sketch).
3. Copy the following code:

#define MOISTURE_PIN A0 // Pin number to which the Soil Hygrometer/Moisture Detection Module is connected void setup() { Serial.begin(9600); // Start serial communication at 9600 bps } void loop() { int moistureValue = analogRead(MOISTURE_PIN); // Read analog value from the module Serial.print("Moisture Level: "); Serial.println(moistureValue); // Print the moisture level to serial monitor delay(1000); // Wait for 1 second }

1. Verify and upload the code to the Arduino board.
2. Open the Serial Monitor in the Arduino IDE to see the readings.

Interpreting measurements

The sensor displays analog values from:

0 to 1023

• Higher values → drier soil
• Lower values → more moisture

(The exact scale may vary depending on the sensor and soil type, so calibration may be necessary.)