Does anyone know if this will work with apm2.8 flight controller?

Apm 2.8 is arduino compatible you should have no problems.

Does this work with a micro:bit?

Yes but you will need a separate power supply to power to sensor. Needs 5v but 4.5v should work.

is the sensor waterproof??

Hi Georgina, Thank you for your question. Sorry but those sensors are not waterproof. We hope this helps. If you need more information, please feel free to let us know. Have a nice day! Kind regards, ELEGOOEU

I am looking to sense a movement of 1mm - is this switch that accurate?

We could not achieve that accuracy, but it is very dependent on surfaces and surface angles. We were trying to measure distances to people.

Elegoo Ultrasonic Sensor | Desertcart INDIA

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Description

📡 Elevate your DIY game with precision sensing that keeps you ahead of the curve!

ENERGY EFFICIENT DESIGN - Consumes less than 2mA quiescent current—perfect for battery-powered, on-the-go innovations.
PRECISION YOU CAN TRUST - 40KHz ultrasonic pulses deliver pinpoint distance accuracy down to 0.3cm resolution.
VERSATILE RANGE ANGLE - Measures distances from 3cm up to 4.5m with a focused <15° detection angle for targeted sensing.
PLUG AND PLAY COMPATIBILITY - Seamlessly integrates with Arduino, Raspberry Pi & MCU boards for instant project upgrades.
BULK READY WITH JUMPER WIRES - Five sensors plus 10 female-to-male Dupont cables—ideal for makerspaces, classrooms, and rapid prototyping.

The ELEGOO Ultrasonic Sensor 5 PCS Kit offers high-precision, low-power distance measurement with 0.3cm resolution and a 3cm–450cm range. Compatible with Arduino, Raspberry Pi, and other MCU platforms, it includes jumper wires for easy integration, making it a must-have for robotics, obstacle avoidance, and innovative DIY projects.

Specifications

ASIN	B01M0QL1F1
Are Batteries Included	No
Best Sellers Rank	7,986 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 2 in Ultrasonic Proximity Sensors
Brand	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (178)
Date First Available	21 Nov. 2018
Guaranteed software updates until	unknown
Hardware Platform	Arduino
Item Weight	9.07 g
Item model number	UK-EL-SM-001
Manufacturer	ELEGOO
Product Dimensions	2.97 x 1.5 x 3 cm; 9.07 g
Voltage	5 Volts

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