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

⚡5V low power operation

🎯15° focused detection angle

📏3cm-450cm precise range

€ 16.58

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Description

📡 Elevate your DIY game with ultrasonic precision that’s impossible to ignore!

ENERGY EFFICIENT - Operates at a minimal quiescent current under 2mA to keep your builds power-smart.
MULTI PACK VALUE - Includes 5 sensors to fuel multiple projects or rapid prototyping sessions.
PINPOINT ACCURACY - Measures distances with 0.3cm resolution for flawless project precision.
COMPACT LIGHTWEIGHT - Sleek aluminum design at just 9g fits effortlessly into any STEM or industrial setup.
VERSATILE COMPATIBILITY - Seamlessly integrates with Arduino UNO, MEGA, Nano, and popular robotics platforms.

The ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit delivers reliable distance measurement from 3cm to 450cm with 0.3cm resolution. Powered by 5V DC and consuming less than 2mA, it features a focused 15° detection angle. Compatible with Arduino and other popular platforms, this 5-pack kit is perfect for robotics, obstacle avoidance, and STEM projects, combining precision, efficiency, and versatility in a compact aluminum form.

Specifications

ASIN	B01COSN7O6
Best Sellers Rank	#29,159 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Ultrasonic Proximity Sensors
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (618)
Global Trade Identification Number	00746591610333
Included Components	Ultrasonic Sensor
Item Dimensions	0.59 x 1.77 x 1.18 inches
Item Weight	9.07 g
Manufacturer	ELEGOO
Material Type	Aluminum
Maximum Supply Voltage	5 volts
Measuring Range	2 centimeters to 500 centimeters
Model	EL-SM-001
Number of Items	1
Output Type	TTL
Part Number	EL-SM-001
Sensing Distance	2
Specific Uses For Product	Personal
UPC	719377200301 746591610333
Unit Count	1 Count
Warranty Description	6 MONTHS

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€ 16.58

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered 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 Italy.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 weeks ago

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