> **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

# Laser Ranging Sensor UART (4-400cm)

**Type:** Product page · **SKU:** SEN0491 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/laser-ranging-sensor-uart-4-400cm.html ([markdown](https://core-electronics.com.au/laser-ranging-sensor-uart-4-400cm.html.md))

This laser range sensor can be used to detect objects in 4~400cm with ±2cm accuracy, UART output, appliable to various detection scenarios like, security...

## Pricing

- **Price:** $42.15 (inc GST) — $38.32 AUD, exc GST
- **Quantity discounts:** 6+ $36.40 (exc GST) · 12+ $34.87 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 24 and Aug 28.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0491:1` (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/SEN0491:1.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 laser range sensor can be used to detect objects in 4~400cm with ±2cm accuracy. With 3 measurement modes supported, it is well applicable to various detection scenarios like security gate detection, access control systems, security alarm devices, smart trash cans, smart cars, or robots for obstacle avoidance.

The sensor metal black shell adopts a threaded barrel design and its probe comes with an optical cover. The integrated design makes the product able to effectively filter optical interference, waterproof and shockproof. The sensor uses an invisible laser and there is a voltage regulator circuit inside the module. Featuring stable performance and UART output, the sensor has an alarm output line that will be triggered to output Low steadily when the measurement distance is smaller than the user-set threshold.

The data will be unstable when measuring black objects.

**Features**

- Laser ranging
- Wide voltage of 6-36V
- UART output
- Made with metal, waterproof and shockproof
 
**Specification**

- Power Supply Voltage: 6-36 V
- Measuring Distance: 4-400 cm
- Measurement Accuracy: ±2 cm
- Emitting Angle: 39.6°
- Receiving Angle: 36.5°
- Working Current: <38mA
- Communication Interface: UART
- Waterproof Rating: IP67
- Baud Rate: 2400-921600 optional 115200 (default)
- Frequency: 20Hz (default)
- Working Temperature: -20~70°C
- Size: 21.5×21×8 mm / 0.85×0.83×0.31 inch
 
**Documents**

- [Product wiki](https://wiki.dfrobot.com/Laser_Ranging_Sensor_UART_4m_SKU_SEN0491)
 
**Parts List**

- Laser Ranging Sensor UART (4-400cm) x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_635.jpg)