5Pcs Ultrasonic Sensor Module Kit HC-SR04 Distance Sensor with 2pcs Mounting Bracket for Arduino UNO Mega R3 Mega2560 Duemilanove Nano Rapsberry Pi 3 Robot XBee ZigBee

I have a project I want to use some of these for but before that I wanted to make sure I knew how to use it. Pretty easy to setup and it works. I am planning on adding a temperature and humidity sensor and add some logic for it to calculate the appropriate speed of sound from those readings just to add a little extra accuracy but it was reasonably accurate just using rough numbers. I don't know if I will use them all but it's nice to have them.

Never thought I'd use the plastic mounting pieces but they are a must have since I mount these on my power wheelchair to tell me how close I am to something as I'm backing up. I also didn't think I'd use the cables since I already had some; but the length of these is perfect for my need. Great product.

Use it with arduino uno board. It worked well

I used this to make a litter box monitor to track my cat's potty patterns. It works perfectly to detects objects entering the litter box, as long as it's not a fluffy cat.This works as advertised, but works best on hard surfaces. It only works on 5V - I tried 3.3V but it doesn't work. Heads up that the echo signal is also 5V, so you may need a voltage divider or level shifter for many microcontrollers.

I think my headline says it all. I would have preferred if they had a data-sheet or instructions. But they do work