> **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

# URM04 v2.0 Ultrasonic Sensor

**Type:** Product page · **SKU:** SEN0002 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/urm04-v2-0-ultrasonic-sensor.html ([markdown](https://core-electronics.com.au/urm04-v2-0-ultrasonic-sensor.html.md))

The URM04 v2.0 Ultrasonic Sensor is developed based upon our popular URM37 ultrasonic sensor. The RS485 interface allows a number of sensors working together. Up to 32 URM04 may be connected together in a network.

## Pricing

- **Price:** $21.20 (inc GST) — $19.27 AUD, exc GST
- **Quantity discounts:** 6+ $18.31 (exc GST) · 12+ $17.54 (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=SEN0002:1` (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/SEN0002:1.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

The URM04 v2.0 Ultrasonic Sensor is developed based upon our popular URM37 ultrasonic sensor. The RS485 interface allows a number of sensors working together. Up to 32 URM04 may be connected together in a network.

The ultrasonic sensor allows you to determine the exact distance of an obstacle in the sonar field of view. The cleverness of your robot will depend on a sensitive sensor similar to the one bats use to know their position and track prey. With advanced programming, you can design compensators in order to perfectly control your motors according to the obstacle's distance.

NOTE: This sensor REQUIRES a RS-485 interface. It can not be connected directly to an Arduino. To make the connection easily we recommend using our IO Expansion shield v5.

![](https://core-electronics.com.au/media/remote_images/beam_36MNhX.jpg)

Specification- Power Supply: +5V
- Current: <20mA
- Working temperature: -10°C~+70°C
- Detecting range: 4cm-500cm
- Resolution: 1cm
- Frequency: 40KHz
- Interface: RS485
- Units: Range reported in cm
- Temperature sensor: 12 bits reading from serial port
- Default Device Address: 0x11
- Default Device baudrate: 19200
- Size: 34x51 mm
- Weight: 30g

Parts List

- URM04 v2.0 Ultrasonic Sensor (1 unit)
- Wire with 4p JST connector(1 unit)

Document- [URM User manual](https://core-electronics.com.au/attachments/localcontent/URM04V2_384637e2b5b.pdf)
- [Product wiki page](https://wiki.dfrobot.com/URM04_V2.0__SKU_SEN0002_)
- [Test Software](https://core-electronics.com.au/attachments/localcontent/URMV4HelpMate_29358f5c212.zip)
- [Test software source code](https://core-electronics.com.au/attachments/localcontent/HelpMate%20SC_34754454bca.zip)
- [Arduino Sample code](https://core-electronics.com.au/attachments/localcontent/URM04Sample_3065497375.rar)
- [Sample from rxcoder](https://core-electronics.com.au/attachments/localcontent/Sample%20from%20rxcoder_2535d70d3a.rar)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0002.jpg)