Where could I buy this sensor?
Need a link where I could find it.
Amazon.
Aliexpress.
The link please. That's what I want.
LM393 is a voltage comparator, not a sensor.
Do you want through hole or surface mount? Which package?
It's a sensor board that happens to use an LM393 for something. The picture you gave us is too small to see what it is, so you have to tell us what kind of sensor it is.
Your image is so blurry as to be unidentifiable.
There are several modules like that. Some for voltage, light (LDR or IR), vibraton and sound (microphone). The LM393 converts the analog signal to a digital signal based on a threshold set by the potentiometer (little blue box).
What is the purpose of the module?
In fact I am trying to design a wireless system with a bluetooth module and a LM 393 module for sound detection to determine the heartbeat rate.
I know I have to use a LM393 module but I don't know exactly which one. I was advised this little module on the picture.
I need for sound
We don't know either... Of course you'll need a microphone, and you'll need a preamp since microphones put-out a few millivolts. A heartbeat is going to be trickier because it's a very-quiet sound.
A comparator puts-out a logic-high or a logic-low. For example, as a sound sensor you can turn-on an LED when the sound is above some loudness level and turn it off when it's below that threshold. In theory, you could blink an LED (or do something else with the signal) every time a heartbeat is heard. But in the real world you're probably going to pick-up lots of other noise and get false triggers.
There are basically 3 kinds of "sound sensors" for the Arduino. One type is like that where it just puts-out digital-high or digital-low depending on loudness. Another type puts out a varying DC voltage proportional to loudness. Or the most common type has a microphone and a preamp and it puts-out an analog audio signal. And some sound sensors have a combination of different outputs.
A search for "Arduino sound modules".
Nor sure if these are sensitive enough to pick up a heartbeat, though.
It is for a 3D printed sthetoscope and I bought a microphone.
I would advise you to do a search for "arduino heartbeat microphone" to see what others have tried/done.
Here is one result of that search: Build Your Own Digital Wireless Stethoscope with Arduino and Bluetooth
Thank you would definitely try this one
I'm not sure how you will use it. The sensor module has its own on board microphone.
Attached you will find an excerpt of the video from which I draw inspiration for my project. It mentions the LM 393 module. I want to know is this the name of the device or is there another more appropriate name. Thanks
Attached you will find an excerpt of the video from which I draw inspiration for my project. It mentions the LM 393 module. I want to know is this the name of the device or is there another more appropriate name. Thanks
Is it this one?
" KY-038 DV 4-6V Microphone Voice Sound Sensor Module"
Description:
This is microphone voice sound sensor module for Arduino
Model: KY-038
Adopt LM393 main chip
Electric condenser microphone
Features Single channel signal output
Low level output signal used for sound control light
Great module for sound alarm system
Working voltage: For DC 4-6V
Interface definition:
AO: analog output sensor
GND: ground
VCC: Power supply input range: 3V-24V.
DO: Digital Output (comparator output)
Two red LED indication: POWER and SENSOR. POWER: Power is off. SENSOR:
When the microphone senses sound reaches a certain value, this LED light.
Thanks Aarg
Another point that is on my mind is how the module is connected to the stethoscope's membrane and how the sound is captured through the video.
I wondered about that too. Why is this not your question, and where to find the module is? Is this not putting the cart before the horse?
Probably the most crucial part of the project, and the author didn't even mention it. Good luck with your project.
I suggest doing some online research, far away from YouTube and Blog sites.