YL-69 Soil Hygrometer Humidity and Moisture Detection Sensor

• The YL-69 Soil Hygrometer Moisture Sensor is a popular and reliable environmental sensor designed to measure the volumetric water content in soil. It works by passing a small electrical current through its two robust prongs; because water is a good conductor, wet soil lowers the resistance, while dry soil increases it.

The sensor kit includes the YL-69 probe and an electronic control board built around the LM393 voltage comparator. It provides dual output modes: a Digital Output (DO) that triggers when a specific moisture threshold (adjustable via an onboard potentiometer) is reached, and an Analog Output (AO) that provides a continuous voltage reading representing the exact soil moisture gradient. This makes it highly versatile for both simple relay-based water pumps and complex microcontroller data-logging systems.

Key Features & Benefits:

• High Sensitivity Probe: The YL-69 probe features widened and thickened traces to enhance durability and corrosion resistance in damp soil.

• Dual Output Modes (AO & DO): Offers an analog voltage output for precise measurement and a digital switch output for immediate threshold triggering.

• LM393 Comparator Chip: Ensures clean, stable logic switching and reliable threshold detection.

• Adjustable Sensitivity: Features an onboard potentiometer to easily calibrate the digital output trigger point based on your plant's specific needs.

• Status Indicators: Includes dual LED lights to indicate power status (red) and digital switching action (green).

Applications:

• Automated plant watering and drip irrigation systems

• Smart garden monitors and hydroponic farming

• Greenhouse humidity and soil moisture tracking

• DIY Arduino and IoT environmental sensor projects