> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# A02YYUW Waterproof Ultrasonic Sensor

**Type:** Product page · **SKU:** SEN0311 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/a02yyuw-waterproof-ultrasonic-sensor.html ([markdown](https://core-electronics.com.au/a02yyuw-waterproof-ultrasonic-sensor.html.md))

Ultrasonic distance sensor determines the distance to a target by measuring time lapses between the sending and receiving of the ultrasonic pulse. This is an easy-to-use...

## Pricing

- **Price:** $36.20 (inc GST) — $32.91 AUD, exc GST
- **Quantity discounts:** 6+ $31.26 (exc GST) · 12+ $29.95 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 01 and Sep 07.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0311:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN0311:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Ultrasonic distance sensor determines the distance to a target by measuring time lapses between the sending and receiving of the ultrasonic pulse. This is an easy-to-use commercial-grade ultrasonic sensor module of high performance and reliability, featuring much smaller blind zone, wider sensing angle and a certain penetration power(smog, dust) compared with other similar [sensors .](https://www.dfrobot.com/category-36.html)

**![](https://core-electronics.com.au/attachments/localcontent/1_3777546835a.jpg)**

**Connection with [Arduino](https://www.dfrobot.com/category-35.html)**

The ultrasonic sensor adopts closed separated probe, waterproof and dustproof, which could be well suitable for harsh and moist measuring environment. All the signal processing units are integrated inside the [module](https://www.dfrobot.com/category-156.html), so users can directly obtain the distance value through Asynchronous Serial Interface. With 9600bit/s band rate, the sensor can easily communicate with upper-host or other MCU, which greatly shortens the developing cycle for users.

**![](https://core-electronics.com.au/attachments/localcontent/2_41815cefea6.jpg)**

**Connection with [Raspberry Pi](https://www.dfrobot.com/category-36.html)**

Use the sensor with [Arduino](https://www.dfrobot.com/category-36.html) controller to build up your projects, such as backing car annunciator, obstacle avoidance [robot,](https://www.dfrobot.com/category-37.html) object approaching detection etc.

**![](https://core-electronics.com.au/attachments/localcontent/3_79449c2327f.jpg)**

**![](https://core-electronics.com.au/attachments/localcontent/4_7719478bb77.jpg)**

**Beam Directionalities Diagram**

**![](https://core-electronics.com.au/attachments/localcontent/5_713370fdf1f.jpg)**

**Dimension Diagram**

### Specification

- Operating Voltage: 3.3~5V
- Average Current: <8mA
- Blind Zone Distance: 3cm
- Detecting Range(Flat object): 3-450cm
- Output: UART
- Response Time:100ms
- Operating Temperature: -15°C ~ 60°C
- Storage Temperature: -25°C ~ 80°C
- Reference Angle: 60º
- Waterproof Grade: IP67

### Documents

- [Product wiki](https://wiki.dfrobot.com/_A02YYUW_Waterproof_Ultrasonic_Sensor_SKU_SEN0311)

### Parts List

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

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0311-1.jpg)