A02YYUW waterproof ultrasonic distance sensor, 3–450 cm, IP67, UART – DFRobot SEN0311

Key features

• Fully sealed integrated body with IP67 rating: withstands dust, splashes and temporary immersion
• Blind zone of only 3 cm: measures almost up to the top of the tank
• 1 mm resolution and ±1 cm accuracy
• 9600 bps UART serial output, 3.3–5 V logic: connects directly to Arduino, ESP32 and Raspberry Pi
• Natively supported by ESPHome for Home Assistant integration (UART version only)
• Measures distance through air: not an underwater ranging sensor; leave at least 3 cm between the sensor and the highest liquid level

Technical specifications

• Operating voltage: 3.3–5 V
• Average current: ≤ 8 mA
• Blind zone: 3 cm
• Measuring range: 3–450 cm
• Resolution: 1 mm
• Accuracy: ±1 cm
• Detection angle: 60°
• Output: UART serial, 9600 bps
• Response time: 100 ms
• Operating temperature: −15 to +60 °C
• Protection rating: IP67

Typical uses

Level monitoring of tanks and rain barrels, automatic plant watering, aquarium auto top-off, smart bins that report when full, outdoor proximity detection.

Package contents

• 1 × A02YYUW waterproof ultrasonic sensor
• 1 × connection cable with PH2.0 4-pin connector