Do these things have to be plugged in?

I see from comments by others that I'm not the only one puzzled by your question. This device is a distance measuring sensor. As such, sensors need to be connected, or plugged into, other circuitry to make them work. In the case of the HC-SR04, it needs a signal, a pulse, from a circuit, Arduino microcontroller for example, to initial distance measurement and a circuit to receive the pulse signal from the HC-SR04 and do a time/distance calculation. Again an Arduino microcontoller. Is this all new to you? If so, there is a lot you will have to learn before you can use this device. There is plenty of help online however.

Can you keep them on 24/7 without running to reliability issues? Any thoughts?

No, this module has no waterproof and temperature compensation function, you need to look for the prefessional one if you want to use it on 24/7.

Will this work for a BeagleBone?

Can't say for sure, have only used these with Uno and Mega, work fine - note they have 4 pins (separate send/receive) as opposed to others with 3 pins (shared send/receive function). Great price - I've seen these sold for as much as $20 each.

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ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit

ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit

Product ID: 25292147

Details

Brand
ELEGOO
Item Weight
9.07 g
Item dimensions L x W x H
0.59 x 1.77 x
Material
Aluminum
Maximum Supply Voltage
5 volts

📏3-450 cm range

🔊40 kHz ultrasonic burst

🛠️5-pack for prototyping

₹ 1757

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Description

🚀 Elevate your prototypes with ultrasonic precision—don’t get left behind!

STEM ROBOTICS READY - Ideal for obstacle avoidance, parking alerts, automatic lids, and interactive STEM projects that impress.
MULTI MODULE FLEXIBILITY - Five sensors included to prototype, compare, and scale your robotics or IoT builds effortlessly.
PRECISION DISTANCE SENSING - Accurately measures from 3 to 450 cm with 0.3 cm resolution for flawless project integration.
ROBUST ULTRASONIC TECHNOLOGY - Utilizes 40 kHz ultrasonic bursts for reliable, non-contact object detection in diverse environments.
SEAMLESS ARDUINO COMPATIBILITY - Plug-and-play with Arduino UNO, MEGA, Nano, and popular modules like XBee and ZigBee for rapid development.

The ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit offers five high-precision sensors operating at 40 kHz, capable of measuring distances from 3 to 450 cm with 0.3 cm resolution. Designed for seamless integration with Arduino platforms, this kit empowers professionals and hobbyists alike to build advanced robotics, obstacle detection, and interactive STEM projects. Its robust design supports outdoor use and continuous operation, making it a versatile tool for innovative prototyping and reliable distance sensing.

Specifications

ASIN	B01COSN7O6
Best Sellers Rank	#21,951 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Ultrasonic Proximity Sensors
Brand Name	ELEGOO
Customer Reviews	4.5 4.5 out of 5 stars (623)
Global Trade Identification Number	00746591610333
Included Components	Ultrasonic Sensor
Item Dimensions	0.59 x 1.77 x 1.18 inches
Item Highlight	Compatible with Arduino UNO MEGA Nano Robot XBee ZigBee, Measure 3-450 cm, Obstacle Avoidance, Parking Alerts, STEM Projects
Item Weight	9.07 g
Manufacturer	ELEGOO
Material Type	Aluminum
Maximum Supply Voltage	5 volts
Measuring Range	3 centimeters to 450 centimeters
Model	EL-SM-001
Number of Items	5
Output Type	TTL
Part Number	EL-SM-001
Sensing Distance	2 centimeters
Specific Uses For Product	Distance Measurement, Electronics Project, Obstacle Avoidance, Robotics, STEM learning
UPC	719377200301 746591610333
Unit Count	1 Count
Warranty Description	6 MONTHS

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₹ 1757

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to India.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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