The YL-69 Soil Moisture Sensor Module is a reliable and cost-effective agricultural moisture detection solution widely used in smart farming, automatic irrigation, Arduino projects, robotics, and IoT-based monitoring systems. This sensor detects the moisture level in soil by measuring electrical conductivity and provides both analog and digital outputs for flexible integration. The module is based on the stable LM393 comparator chip, ensuring accurate signal comparison and consistent performance in various environmental conditions.

This soil hygrometer sensor is ideal for plant monitoring, agricultural research, greenhouse systems, automatic watering devices, educational electronics projects, and smart agriculture applications in Bangladesh. Available from BDTronics, a trusted electronics and robotics components seller in Bangladesh.

Features:

• Detects soil moisture and humidity levels accurately using conductivity-based sensing

• Dual output modes with both analog output (AO) and digital output (DO)

• Digital output provides HIGH or LOW signal based on adjustable moisture threshold

• Analog output offers continuous voltage values for precise soil moisture measurement

• Built-in LM393 comparator chip for stable and reliable operation

• Adjustable sensitivity using onboard blue potentiometer

• Power indicator LED and digital output status LED for easy monitoring

• Compatible with Arduino, ESP8266, ESP32, Raspberry Pi, PLC, robots, and smart controllers

• Suitable for automatic watering systems, smart irrigation, plant care, and agricultural automation

• Compact design with mounting holes for easy installation in projects and enclosures

How to Use:

• Insert the YL-69 probe into the soil near plant roots for accurate moisture detection

• Connect VCC to a 3.3V or 5V power supply from the microcontroller

• Connect GND to the system ground

• Use the DO pin to get a digital HIGH or LOW signal based on moisture threshold

• Use the AO pin to read analog voltage through an ADC pin for precise moisture level data

• Adjust the onboard potentiometer clockwise to increase the moisture threshold

• Rotate the potentiometer counter-clockwise to decrease the moisture threshold

• Monitor the LED indicators to confirm power and digital output status

• Integrate with control logic to activate water pumps or alarms when soil moisture is low

Applications:

• Automatic plant watering and irrigation control systems

• Smart agriculture and precision farming projects

• Home gardening and greenhouse monitoring

• Arduino and microcontroller-based educational projects

• Robotics, smart car, and automation systems

• Soil moisture data collection for research and experiments

• IoT-based environmental monitoring solutions

Wiring Details:

• VCC: Connect to 3.3V–5V external power supply

• GND: Connect to system ground

• DO: Digital output pin for HIGH/LOW soil moisture detection

• AO: Analog output pin for continuous voltage-based moisture measurement

Specifications:

• Sensor Model: YL-69 Soil Moisture Sensor Module

• Comparator IC: LM393

• Operating Voltage: 3.3V – 5V DC

• Output Types: Analog (AO) and Digital (DO)

• Sensitivity Adjustment: Onboard potentiometer

• Indicator LEDs: Power LED, Digital Output LED

• Interface: 4-wire connection

• Mounting: Fixed bolt holes for secure installation

• Compatibility: Arduino, ESP32, ESP8266, Raspberry Pi, microcontrollers

• Application Environment: Soil moisture and humidity detection

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