> **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

# Water-proof Ultrasonic Sensor (ULS)

**Type:** Product page · **SKU:** SEN0300 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/water-proof-ultrasonic-sensor-uls.html ([markdown](https://core-electronics.com.au/water-proof-ultrasonic-sensor-uls.html.md))

This is an ultrasonic distance sensor(ULS) of high performance with an enclosed waterproof probe. The sensor, like many other ultrasonic sensors, based on the principle...

## Pricing

- **Price:** $46.80 (inc GST) — $42.55 AUD, exc GST
- **Quantity discounts:** 6+ $40.42 (exc GST) · 12+ $38.72 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0300:1` (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/SEN0300:1.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

This is an ultrasonic distance sensor(ULS) of high performance with an enclosed waterproof probe. The sensor, like many other ultrasonic sensors, based on the principle of ultrasonic echo ranging, determines the distance to a target by measuring time lapses between the sending of a pulse and receiving of the echo without contacting. It can be used to detect transparent or non-ferrous objects, metal or non-metallic objects, liquid, solid, powder materials and so on. The unique physical bell-mouth shell of the sensor greatly improves the directivity and stability of its output ultrasound.

 **Note:** the internal probe surface is regarded as the detecting starting point by default. If you take the plane of the bell-mouth as starting point, then the distance will be the detected distance minus 40mm.

## ULS Beam Directionalities Diagram

![](https://core-electronics.com.au/attachments/localcontent/1_79449c2327f.jpg)

## Dimension Diagram

![](https://core-electronics.com.au/attachments/localcontent/2_466819d0305.jpg)

## Features

- High Degree of Protection
- Wide Power Supply Range, Low Power Consumption
- High Measuring Accuracy and Resolution
- High-Precision Temperature Output and Temperature Compensation Function
- Varied Output Modes: Serial Port, PWM, Switch
 
## Specification

- Supply Voltage: 3.3V~12V
- Operating Current: average current 5mA (based on power supply: 5V; duty cycle: 250ms)
- Center Frequency: 40KHZ
- Blind Zone: 270mm
- Maximum Detection Distance: 8000mm
- Resolution: 1mm
- Operating Temperature: -15°C - 60°C
- Storage Temperature: -25°C - 80°C
 
## Documents

- [Product wiki](https://wiki.dfrobot.com/Water-proof%20Ultrasonic%20Sensor%20(ULS)%20%20SKU:%20SEN0300)
 
## Parts List

- Water-proof Ultrasonic Sensor (ULS) x1
- Screw bag x1
- Connector x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0301.jpg)