Oiyagai 5pcs DC 3.3-5V Passive Low Level Trigger Buzzer Alarm Sound Module for Arduino

These were good sensors. No problems or issues.

Thank you to Amazon for the very rapid response to replace this order. But shame on Oiyagai. All 5 of the units came in their own package. Unfortunately, all of the individual packages had already been opened. All 5 of the packages had been hand marked with an X. All 5 of the modules had either an X or a "-" written on the sticker covering the speaker. None of the parts worked properly. I was sent REJECTS! Very happy with Amazon, not so much with Oiyagai. Maybe it was just the work of a disgruntled emplyee and not a real reflection of the company. Let's hope so. But I can't give a better rating at this point. Unacceptable service.I received the replacement units yesterday. Unfortunately, the same story. Opened and marked packages. Only two of the 5 units worked. HOWEVER, these units are listed as passive buzzers. They are not. The instructions listed are not for this device, not even close. For the two units that worked, if I put +5V on the VCC pin and ground the GND pin, and let the I/O pin float (no connection) no sound comes out. If I ground the I/O pin, it emits a high pitched tone. If I put +5V on the I/O pin, no sound comes out. One would have expected, in the absence of a description, that a +5V input would activate the sound instead of ground. Again, I was sent rejects. So either I got the same disgruntled employee or this seller is suspect.Update 1-20-23. I am not changing my rating because of all of the misrepresentations and poor quality control. However, further investigation has revealed that there are both active (grounded input = on) and passive versions of this product and that they are visually indistinguishable. So while I reported that some of these units did not work, it may well be that I was using an active testing procedure on a passive device and vice versa. There is still no excuse for not delivering what is described. In retrospect, I think they are opening the packages to determine passive vs active but then fail to do anything useful with that knowledge. Since I returned my units I can't verify this but my buddy had a number of these same devices and we were able to confirm this situation with his collection of buzzers.

3 stars because it works. Missing 2 because of lack of clarity.This "buzzer" is a BEEPER, it BEEPs when power is connected and it is activated.You do not need tone output to drive it .Just power, 3.3V to 5V to the Vcc pin, gnd to the gnd pin, and an output from your Arduino.You think you're buying a passive transducer but you get an active beeper.

This review is for the "Willwin 5pcs DC 3.3-5V Passive Low Level Trigger Buzzer Alarm Sound Module for Arduino".One star off for not marking "VCC" as "3.3V". Otherwise this device works pretty well for my application. I"m driving it from an ESP8266 board's GPIO pin using PWM. So far I've found that the tone() function works the best for this. And it is definitely loud! Leave the sticker on it when you try it the first time. Your ears will thank you!

Needs level shiftier to use with a Raspberry Pi

Good for my projects

Funny how Amazon allow to report a wrong product description but yet the description remains unchanged. This is an active beeper, it will not play a ring tone and you cannot change its frequency by sending it a PWM signal. Connect VCC to 5V and ground pins and it beeps when I/O pin goes to ground. Should the description have indicate this which I find important, I would not have bought this as I was looking for a passive device.

POOR SOLDERING & NO QUALITY CONTROL. The first 2 I opened up didn't work due to bad soldering, I was very frustrated. I finally got the 3rd & 5th one to work with an Arduino program to toggle the I/O pin.I was looking for something to apply 5 - 12 volts to and get a buzz out of. Apparently I need an ACTIVE buzzer. NOT A HAPPY CAMPER.