XiaoR Geek2pcs Ultrasonic Module HC-SR04 Distance Sensor with 2pcs Mounting Bracket for Arduino Uno R3 Mega 2560 Nano Raspberry Pi 3 Smart Robotics Projects

I used these in conjunction with a pro micro to make a parking sensor in my garage. They work great.

This review is for the Ultrasonic sensors, come with a nice package and both work as expected. The free standard shipping delivered the package from NV to CA in 4 days. Although the outside packaging is good, the inside is not ideal. The screws and cables are packed together with the ultrasonic modules in the same zip lock bag. Not only the screws are loosely bouncing with the modules during the shipment, but also one of the screw is stuck between the delicate crystal on the module and the mount. Couple pins are bent on one of the module and most likely from the factory. Great customer support and communication, without problem getting responses from them. The performance is typical with other ultrasonic sensors I purchased. Both can detect from couple cm and up to 180 cm (+- 1~2 cm) reliably, but hit/miss beyond the 180 cm. The price is not the most expensive nor cheapest, but it is fair if you are in a rush.

It works well with my Arduino. In my testing both modules are accurate to within 2 cm up to a couple meters, which is plenty for my purposes. I'm using the "NewPing" Arduino library to get the distance. I also appreciate the generous number of wires included with various combinations of male and female pins.

With our Arduino and Raspberry Pi motherboard, it can get the ultrasonic data directly and it is very easy to use.

Good product. Worked with my mars rover stem project.