8pcs Ultrasonic Sensor Module HC-SR04 with 4pcs Mounting Bracket Distance Sensor Compatible with Arduino Kit, for Mega2560, Robot, Duemilanove (8)

Works as expected with the Arduino platform.

Mainly bought it for the ultrasonic sensor holders which fit amazingly

Easy to use, accuracy was good, connection is easy and the plastic holders are useful.

Used the link to download the library and all files. The examples came back with 1kb file length and empty sketches. When including the library and defining an ultrasonic sensor, the ranging() method returns a constant value. If you lookup sample code for an ultrasonic sensor, bypass the library and use digital writes to pulse the trigger pin and then use pulseIn to read the Echo pin, the sensor works great. Leaving seller feedback to look at the files provided.

The brackets work much better than some of the cobbled together mounts I've seen. Keeping the sensor in a fixed position is key to repeatable performance.

I used this for a hobby raceway for object detection. They work perfectly. Great value and it comes with enough extras for future projects. I am happy

I have used these in the past for the makeshift radar that can be found all over the internet as well as a "learning" robot car. IMHO they are accurate enough for hobbyist and those tinkering with arduino/raspberry pi platforms. I recommend these to anyone looking to expand their experience with programming and those tinkering with arduino and raspberry pi.

Bought for my train layout to sense trains on tracks approaching to light cross buck signals