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.
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These are far more interesting than you might think
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")
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- Reviewed in the United States on September 2, 2017
- Reviewed in the United States on May 19, 2024
- Reviewed in the United States on September 4, 2017
- Reviewed in the United States on March 30, 2023
- Reviewed in the United States on May 8, 2024
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:
These are far more interesting than you might think
Reviewed in the United States on May 8, 2024
* 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")
Images in this review
