SEN0311 A02YYUW

Introduction

The A02YYUW Waterproof Ultrasonic Sensor is a reliable, high-performance ranging module designed specifically for makers and smart home enthusiasts. This IP67-rated sensor delivers stable distance measurements from 3cm to 450cm, even in harsh, humid environments. Featuring a tiny 3cm blind spot and a simple UART interface, it's the perfect non-contact level sensor for DIY projects like water tank monitors, automatic plant watering systems, or smart trash cans. The ranging module seamlessly integrates with Arduino, ESP32, Raspberry Pi, and enjoys support for ESPHome, making Home Assistant automations easier than ever.

True IP67 Waterproofing for Long-Term Stability

Humidity can ruin a project. Unlike sensors with exposed circuit boards (like the HC-SR04) or inconvenient split designs (JSN-SR04T), the A02YYUW ultrasonic distance sensor features a fully sealed, integrated body. Its IP67 waterproof rating means it can withstand dust, splashes, and even temporary submersion. This robust design ensures stable, reliable data output over the long term, making it the ideal choice for outdoor applications or continuous liquid level monitoring.

IP67 Waterproof A02YYUW Ultrasonic Sensor

Measure What Matters: The 3cm Ultra-Small Blind Spot Advantage

When monitoring a tank, every centimeter counts. The JSN-SR04T, has a massive 20cm blind spot, making it impossible to detect when a tank is nearly full.

The A02YYUW sonar sensor solves this with an industry-leading 3cm blind spot. This allows for accurate distance readings right up to the top, providing precise control over water levels and preventing overflows in automated systems.

A02YYUW Waterproof Ultrasonic Sensor features 3cm Blind Spot

Beam Directionalities Diagram

Smart Home Simplified: ESPHome & Home Assistant Ready

Bring smart home projects to life with unparalleled ease. The A02YYUW home assistant distance sensor is compatible with ESPHome, allowing integration into a Home Assistant dashboard. Build powerful automations without the struggle of complex programming. Whether it's a sump pump monitor or a pet water bowl auto-filler, this ultrasonic distance sensor is the perfect non-contact water level sensor for smart home ecosystem.

A02YYUW Waterproof Ultrasonic Sensor compatible with ESPHome & HomeAssistant

Maker-Friendly & Versatile for All Projects

This ultrasonic distance detection sensor is designed with the DIY community in mind. It operates on a flexible 3.3V-5V power supply and communicates via a standard UART serial port, making it incredibly easy to connect to any microcontroller. It's fully compatible with popular platforms like Arduino, ESP32, and Raspberry Pi. A connection cable is included, allowing projects to be up and running in minutes, not hours.

A02YYUW Waterproof Ultrasonic Sensor compatible with Arduino / ESP32 / Raspberry Pi

Applications

• Smart Plant Watering System: Monitor the reservoir level and automatically trigger a water pump.
• Water Tank Level Monitor: Get real-time water volume data from a home water tank or rain barrel.
• Aquarium / Fish Tank Automation: Create an auto top-off system to prevent low water levels.
• Smart Trash Can: Detect if the trash can is full and needs to be emptied.

Specification

• Working Voltage: 3.3V - 5V
• Average Current: ≤ 8mA
• Blind Spot Distance: 3 cm
• Detection Range: 3 cm - 450 cm
• Output Interface: UART Serial Port
• Response Time: 100 ms
• Operating Temperature: -15°C to 60°C
• Waterproof Level: IP67
• Measurement Accuracy: ±1 cm
• Reference Angle: 60°

Documents

• Product Wiki & User Manual
• Timing Diagram
• Home Assistant Integration Guide

Shipping List

• A02YYUW Waterproof Ultrasonic Sensor x1
• PH2.0-4P Connector x1