MakerHawk 4pcs Analog Ceramic Piezo Vibration Sensor Module 3.3V/5V for Arduino DIY Kit

My husband got these for a project he is working on with his buddy and from all the noise they were making over them it seems they love them. They worked perfectly.

No fuss no muss, works as advertised. I'll be ordering more for several projects.

Solid product and easy to use

The sensors themselves are fine, they do what they're meant to. The little bit of signal conditioning on the breakout board is basically useless. I think there's a Zener diode and a resistor on there but there's no documentation to reference so it's pretty much impossible use them effectively.

Only 2 of the four functioned correctly, and I’m very adept to electronic equipment and soldering.

The wires are too thin to hold in the terminal blocks. The terminal block screws get stuck. The readings are all over the place. They were cheap but not even worth that. Don’t bother.

The wires fall right out of the screw terminals but I can put on beefier wires or replace the screw terminals. What's amazing is how nice these work for $1.50 each. Very sensitive but not noisy. Well worth the price.

I tried two of the four modules, and could not get decent readings on either of them on my Wemo d1 mini. Also, as someone wrote in answer to a question, the wires to the piezoelectric crystal are too thin to grab with the screw terminals. That is a complete waste. I had to desolder the screw terminals and just solder them to the board. But that was still insufficient to get the things to work.