A02YYUW Waterproof Ultrasonic Distance Sensor

The DFRobot A02YYUW is a waterproof ultrasonic distance sensor with a sealed transmitter and receiver (IP67). It measures distances from 3 cm to 4.5 m and therefore suits outdoor use and humid environments, for example the water level in a tank. The processing takes place in the sensor, the distance arrives as a finished value via UART at 9600 baud.

Recommended alternative for longer distances up to 7.5 m: A01NYUB Waterproof Ultrasonic Distance Sensor

Recommended Accessories:

• 95x65x55mm IP67 Plastic Enclosure
• Dupont Jumper Cable Set 20cm 60 Pieces.

Features:

• Water and dust tight to IP67
• Distance as a finished value via UART, no time measurement in the microcontroller needed
• Measuring range applies to flat objects, blind zone 3 cm
• Pin RX selects between processed value and real-time value, procedure in the DFRobot wiki
• Temperature changes the speed of sound, air flows from fans can deflect the measurement (DFRobot)
• Example code for Arduino and Raspberry Pi in the wiki
• Measurement takes place through air, IP67 does not make it a sensor for underwater ranging; leave at least 3 cm between sensor and highest water level (DFRobot)
• Usable directly in ESPHome and Home Assistant as component a02yyuw (UART version only)

Application Examples:

• Level in water tanks and cisterns
• Reversing and distance warning
• Distance measurement outdoors
• Monitoring in humid environments

Documentation:

• DFRobot Wiki A02YYUW (SEN0311)
• ESPHome component A02YYUW

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0311
• Type: A02YYUW
• Operating voltage: 3.3 to 5 V
• Interface: UART, 9600 baud
• Measuring range (flat object): 3 to 450 cm
• Blind zone: 3 cm
• Resolution: 1 mm
• Accuracy: ±1 cm
• Response time: 100 ms
• Frequency: 40 kHz
• Current consumption: at most 8 mA on average, standby at most 5 mA
• Beam angle: 60°
• Operating temperature: -15 to 60 °C
• Storage temperature: -25 to 80 °C
• Cable length: 30 cm
• Protection class: IP67
• Connections: VCC, GND, RX, TX
• Dimensions: 84.5 × 30 × 19 mm
• Weight: 48 g

Scope of Delivery:

• 1× A02YYUW waterproof ultrasonic distance sensor
• 1× Adapter cable PH2.0-4P to 4 Dupont connectors