Gravity FS-IR02 Photoelectric High Accuracy Liquid Level Sensor 5V

Overview

DFRobot Gravity FS-IR02 Photoelectric Liquid Level Sensor is a 5V liquid level detection module designed for Arduino and other microcontroller projects. It uses photoelectric sensing rather than a mechanical float, helping deliver good sensitivity, stable switching, and reduced calibration effort in liquid level monitoring applications.

The corrosion-resistant probe is easy to mount and is built to work in demanding environments. According to the supplier data, it can operate across a wide temperature range from -25 to 105℃ and is suitable for conditions involving high temperature and high pressure.

This sensor outputs a digital-style level signal: when liquid comes into contact with the probe, the controller reads a HIGH logic state; when no liquid is present at the probe, it reads LOW. For best performance, avoid placing the sensor near bright lights or direct sunlight, as optical interference may affect readings.

Specifications

Technical details for the FS-IR02 liquid level sensor.

Usage Notes

This sensor is suitable for liquid presence and level point detection in tanks, containers, dispensing systems, automation projects, and DIY monitoring setups that need a clean 5V interface.

Reference Arduino example setup uses a DFRduino UNO and reads the sensor as a digital input. This makes the FS-IR02 straightforward to integrate into basic liquid alarm, pump control, and level-trigger projects.

Important: As this is an optical sensor, avoid installation near intense ambient light or direct sunlight to reduce the chance of interference.

Key Features

• 5V water level switch for Arduino and microcontroller projects
• Photoelectric sensing with high sensitivity
• Less calibration compared with mechanical alternatives
• Corrosion-resistant probe
• Easy to mount in practical builds
• Handles high temperature and high pressure environments