> **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

# Miniature Ultrasonic Distance Ranging Obstacle Avoidance Sensor (3m, RS485, IP67)

**Type:** Product page · **SKU:** SEN0591 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/miniature-ultrasonic-distance-ranging-obstacle-avoidance-sensor-3m-rs485-ip67.html ([markdown](https://core-electronics.com.au/miniature-ultrasonic-distance-ranging-obstacle-avoidance-sensor-3m-rs485-ip67.html.md))

With a measurement range of up to 3m, the miniature ultrasonic distance ranging parking sensor provides waterproof rating of IP67. Ideal for garage...

## Pricing

- **Price:** $42.85 (inc GST) — $38.95 AUD, exc GST
- **Quantity discounts:** 6+ $37.01 (exc GST) · 12+ $35.45 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 19 and Aug 24.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0591:1` (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/SEN0591:1.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

With a measurement range of up to 3m, the RS485 ultrasonic obstacle avoidance [distance ranging sensor](https://www.dfrobot.com/category-55.html) offers advantages such assmall blind zones (Measurement accuracy: 1 + (S \* 0.3%) cm),narrow measurement angles (30-60°),short response times (15-750ms),filtering of same-frequency interference,compact size,high installation adaptability,IP67 dust and waterproof capabilities, a long lifespan, and high reliability.It is designed for robot automation and control applications.

Utilizing innovative ultrasound processing technology, it can identify and filter out foreign ultrasound, resulting in more stable and reliable data output. This greatly reduces the probability of same-frequency interference, meeting the complex environmental application requirements in the field of robot automation control.

It features RS485 output for sensor data, and users can use it in conjunction with [Arduino's TTL to RS485 expansion board](https://www.dfrobot.com/product-1024.html). It finds wide applications in robot obstacle avoidance, automatic control, parking management systems, security gate detection, access control systems, and object proximity and presence detection.

![Wiring Diagram of RS485 ultrasonic obstacle avoidance sensor and Arduino TTL to RS485 expansion board](https://core-electronics.com.au/attachments/localcontent/1_15767d2d6d5.jpg)

Figure: Wiring Diagram of RS485 Ultrasonic Distance Ranging Sensor and Arduino TTL to RS485 Expansion Board

###  Features

7. Compact size and small blind zone
8. Lightweight and fast response time
9. Waterproof level of IP67
10. Intelligent ultrasound processing technology for reduced interference
###  Applications

12. Robot obstacle avoidance
13. Automatic control
14. Parking management systems
15. Security gate detection
16. Access control systems
17. Object proximity and presence detection
###  Specification

19. Measurement range: 2-300cm
20. Measurement accuracy: 1 + (S \* 0.3%) cm
21. Operating voltage: 3.3-12V
22. Operating current: =10mA
23. Communication method: RS485
24. Output response time: 15-750ms
25. Power-on delay operating time: =1000ms
26. Detection angle: 30-60°
27. Operating temperature: -25°C~ 65°C
28. Operating humidity: 65% ~ 80%RH
29. Storage temperature: -30°C ~ 80°C
30. Storage humidity: 65% ~ 90%RH
###  Documents

32. [Product wiki](https://wiki.dfrobot.com/Ultrasonic_Ranging_Sensor_3m_SKU_SEN0591)
###  Parts List

34. Ultrasonic Ranging Sensor (3m) x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN0591-1.jpg)