# Large Ultrasonic (Sonar) Sensor with Horn and UART Output

**Type:** Product page · **SKU:** ADA4664 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/large-ultrasonic-sonar-sensor-with-horn-and-uart-output.html ([markdown](https://core-electronics.com.au/large-ultrasonic-sonar-sensor-with-horn-and-uart-output.html.md))

This impressive looking horn is actually an ultrasonic sensor, ready for panel mount use. Inside is a module that uses high frequency signals to determine distance to a surface, and the horn helps guide the waveform so it can reach farther without spreading too wide. It's elegant looking and is more durable than the 'raw' ultrasonics Adafruit sell a lot of, so it would do well in a garage, robot or installation where you want a durable dust and weather-resistant design

## Pricing

- **Price:** $52.40 (inc GST) — $47.64 AUD, exc GST
- **Quantity discounts:** 10+ $46.21 (exc GST) · 50+ $45.25 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today; more stock is typically available with a 8–12 day lead time.

## Description

This impressive looking horn is actually an ultrasonic sensor, ready for panel mount use. Inside is a module that uses high frequency signals to determine distance to a surface, and the horn helps guide the waveform so it can reach farther without spreading too wide. It's elegant looking and is more durable than the 'raw' ultrasonics Adafruit sell a lot of, so it would do well in a garage, robot or installation where you want a durable dust and weather-resistant design. It has a range of 28 cm to 750 cm with a read resolution of 1mm (precision isn't specified, but its probably about 5-10 mm). As you get to the longer distances, its important to take into account the spread of the cone, which is about 40 degrees. Adafruit weren't able to get a reading of 750cm, but Adafruit did reach 600 cm (in Adafruit's small apartment).

This sensor has UART output, so it can connect to a microcontroller or microcomputer with a TTL serial port. You can also connect it to a computer [using a USB-to-serial adapter](https://core-electronics.com.au/usb-to-ttl-serial-cable-debug-console-cable-for-raspberry-pi.html) and read data from the operating system's COM or serial port device.

It comes with a 2mm pitch connector you can cut off or re-purpose. To use, simply connect the red wire #1 to 3 or 5V, black wire #2 to ground, skip #3 and connect #4 to your serial input pin and read the data in at 9600 baud. A blue LED on the back will blink with each reading. [Check out the Arduino and Python example code to get readings in a jiffy!](https://github.com/adafruit/Adafruit_Learning_System_Guides/tree/master/DYP_ultrasonics)

This sensor has a 'blind' zone distance of 0 to 28 cm, that means *it can't accurately tell when something is less than that distance away*. it's best used when you know that the object you're sensing is at least 30 cm from the sensor!

[We carry a large variety of distance sensors here if this fellow isn't what you're looking for.](https://core-electronics.com.au/search/?q=distance+sensors)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/6/4664-03.jpg)