Review on π Enhance Distance Sensing with Excelity 3pcs Ultrasonic Module HC-SR04 and Mounting Bracket by Robert Berio
Inexpensive, accurate and so far so good.
I think I bought them at a bargain price. Make sure you connect them to 5v and use 330 ohm resistors for the echo, although most manuals claim they run on 3.3v. They work perfectly and are very accurate on the automatic door sliders for my house and show tight bodies on both sides of the door. It's funny how educational modules and sensors can do so much for so long.
- Expensive
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