YL-69 Soil Moisture Detection Sensor Module

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The YL-69 Soil Moisture Sensor Module is designed to measure the moisture content in soil. It is commonly used in agriculture, gardening, and automated irrigation systems to monitor soil moisture levels and control the watering of plants based on soil conditions.

This sensor module employs a resistive sensing technique to measure soil moisture. It consists of two electrodes or probes that are inserted into the soil. When the soil moisture level changes, the electrical resistance between the probes also changes. The module converts this resistance into an analog voltage signal, which can be read by a microcontroller or analog-to-digital converter (ADC).

Specificatoins of YL-69 Soil Moisture Detection Sensor Module:

  • Type: Soil Moisture Sensor Module
  • Sensing Method: Measures soil moisture using a resistive sensing technique
  • Output Signal: Analog voltage signal, Digital
  • Operating Voltage: 3.3V to 5V DC
  • Having LM393 comparator chip, stable.
  • Pin Number: 4 Pins
  • PCB board Size: 32mm x 14mm
  • Prob Size: 60mm x 20mm

Features of YL-69 Soil Moisture Detection Sensor Module:

  • One of the notable features of the YL-69 Soil Moisture Sensor Module is its sensitivity adjustment. It often includes a potentiometer that allows you to adjust the sensitivity or detection threshold. This adjustment is useful for customizing the sensor's response to specific soil types or moisture levels.
  • Typically, these modules operate on a voltage supply of 3.3V to 5V DC, making them compatible with most microcontrollers and development boards. They are compact in size, easy to install, and can be used in various soil moisture monitoring and control applications.
  • Soil Moisture Sensing: Measures soil moisture levels using resistive sensing.
  • Analog Output: Provides an analog voltage signal proportional to soil moisture.
  • Sensitivity Adjustment: Includes a potentiometer for customizing sensitivity.
  • Usage Tip:
  • Calibrate the sensor for the specific soil type and moisture levels in your application.
  • Ensure proper soil contact with the electrodes for accurate readings.
  • Caution:
  • Be cautious when inserting or removing the sensor probes to avoid damaging them.
  • Avoid prolonged exposure to moisture, which could affect the sensor's longevity.

How to Use YL-69 Soil Moisture Detection Sensor Module:


VCC: external 3.3V , 5V.

GND: GND External.

DO: digital output interface(0 and 1)

AO: analog output interface

Operation Manual:

1. A soil moisture and humidity module most sensitive to the environment usually used to detect soil moisture.

2. Modules in the soil moisture reach the set threshold, DO port output high when soil moisture exceeds a set threshold, the module D0 output low;

3. Digital outputs D0 small plates can be directly connected with the microcontroller through the microcontroller to detect high and low, thereby detecting soil moisture;

4. Small plates digital output DO OUR relay module can directly drive the buzzer module, which can be composed of a soil moisture alarm equipment;

5. Small plates AO analog output modules can be connected and AD through the AD converter, you can get a more accurate value of soil moisture;

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