5PCS High Sensitivity Sound Microphone Sensor Detection Module for Arduino AVR PIC

Works great. Using it to make a noise sensor for turning on a motor when the noise is loud enough. It's parked right in front of the noise producer with lots of background noise so the adjustment is perfect for me.I will say the square wave voltage appears to linked to the loudness tripping it, which is really dissapointing, rather than full voltage, so I'll probably have to run this with a transistor to get a clean full voltage sign. But it works fine on 5 volts unlike another review says.

All 5 worked properly, at least for initial testing. I've compared to the Adafruit Electret Microphone Amplifier with Adjustable Gain, and the SMAKN® 3.3V/3.5V MAX9812 Microphone Amplifier Sound MIC Voice Module for Arduino. These seem to perform comparably, though they're quite a bit bigger if that matters.One potentially nice thing these have that the others don't is a little LED indicating when it's detecting a signal. (At least, that's what it seems to do.) Perhaps not very useful, and I'm not sure at this point how configurable that might be, but it's interesting when configuring the gain adjuster.

I purchased this to attempt to make a driveway alarm. I have tried a beam break sensor but that would trigger whenever a deer walked down the driveway. I tried a coil that would detect metal but the gravel driveway made it impractical. I tried a IP camera with vehicle detection but for some reason that was not positive at night.My driveway is about a quarter mile long and made of crushed limestone. I wanted to know when somebody started to enter the property but not trigger when the vehicle exits. I made two sensors using the product. Each installed in a PVC tube then buried them about twenty-five feet apart and six inches deep. The control wires were ran to a weather proof housing and connected to a MSP430 controller board I had constructed for a previous project.The MSP430 draws in the micro uA range. Much lower than an Arduino or raspberry pi. Power is provided by a small solar panel about thirty feet away. I recorded the output of the sensor with a storage scope and used the recording to write the script for the controller. I have it set up so the controller analyzes the output from each sensor before triggering a wireless transmitter. I was able to set the gain control so the output goes between high and low numerous time . The controller is set to trigger only there are two high to low level changes in a two second period. Using the two sensors I am able to be alerted when a vehicle is entering the property and not send an alert when they are leaving. So far it's working great.

One of them didn't work, but meh for the price I can't complain. The one that didn't work had a huge scratch on the back tearing the traces, I honestly thing this was one of those rare occasions of handling damage, and I bet if I ordered again it probably wouldn't happen but still it did so 4 stars.

What this module does is let you know when the audio level is above a certain level. You can adjust that level with the pot easily. So, anytime the audio level is above a certain threshold, you get a digital HIGH reading, and when it's below that threshold, you get a digital LOW. What may be confusing to some people is that the digital signal fluctuates at roughly the same frequency as the audio signal. One a scope it looks just like clipped audio. If you're looking to see a solid digital HIGH, like to turn on a light, when the audio get high, you may want to add some filtering. I'm using these to trigger some photo strobes, and they work awesome. Very sensitive, which is perfect for my application.

They are basically junk, they work only if you want to differentiate between some sound and the background noise, however they are not sensitive enough to use in any useful way. Go with the SparkFun sound detectors instead.

I thought these were going to be kinda boring and useless, but - my imagination is starting to run a bit wild with these. I hooked one up to an oscilloscope to just play around with it and found these things:* The trim pot allows you to set a trigger threshold - but it's not as black and white as you might think.* If you set a threshold to not react to sound unless it hits a certain level, you get a waveform that sits at 0V most of the time, only occasionally producing square wave pulses when sound is detected that goes over the threshold* Conversely, if you set a threshold to react to ambient noise, you'll normally see it at VCC - *but* if you e.g. talk or whistle or whatever, you'll actually see pulses that go to zero. I think this is something getting saturated for a bit and then recovering - regardless, it's pretty cool.* You could *maybe* do some duty-cycle type stuff with it* I believe it'll also function as an analog input to an arduino because the analog ports are really just sampling voltage and you'd generally end up somewhere between 0 and VCC if you average over time.First pic is "high sensitivity in a room with background noise in which someone whistles".Second is "low sensitivity in a room with background noise in which someone whistles"Third is a zoom in of the "low sensitivity" one as the pulse train starts (it is a chaotic "train")