Turn on a LED after playing certain WAV file

I have a laptop computer that runs a program and when it finishes running, it plays a WAV sound file (which I can preselect) to tell me that it has finished. Sometimes I am not around to hear the sound so I would like to have a LED light turn on to show that it has finished running.

One solution is to have some kind of software installed on the computer to do this but I prefer to have NO software installed on that computer for various reasons. I want a hardware solution that does not require any software drivers outside of what the Windows operating system provides.

For example, my first attempt was to use a USB stick and put my WAV file on the USB stick. When the program ends, it reads the WAV file from the USB stick hence causing the LED on the USB stick to flash. Then all I have to do is build a simple latch circuit to keep the LED turned on.

The problem with this approach was that once the operating system read the WAV file, it kept the WAV file in its internal cache, henceforth, it no longer goes to the USB stick to read the WAV file. I found no way to turn off READ caching on a USB stick, only possibility was turning off Write Caching.

I also thought about making this USB drive a network shared drive to somehow force the operating system to re-read the file but I didn't get too far because I don't know enough.

To recap, I am looking for a hardware solution to turn on a LED when a certain preselected WAV file is played, and it should:

- involve no software other than what Windows come with

- need to leave the speaker operational as normal speaker which means you should not alter the use of the speaker just for this purpose nor should you count on the volume setting being set at certain level (it should work even if sound is muted), also there is no line output signal on this laptop

I don't mind spending some money on hardware development and/or modification because I can think of many uses for this but the actual hardware material costs has to be low (

Skills: Electrical Engineering, Electronics, Embedded Software, Microcontroller

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About the Employer:
( 0 reviews ) Gomel, Belarus

Project ID: #3976786

11 freelancers are bidding on average $175 for this job


i can help you

$250 USD in 5 days
(18 Reviews)

Hi I think you have to think again the problem.

$180 USD in 10 days
(6 Reviews)

Have you considered using the headphone port. It is the simplest option and most effective. Also, there are some other options but would be a little expensive to develop. e.g using a WiFi port or an ethernet port to d More

$250 USD in 7 days
(2 Reviews)

PLease Read PM sir :)

$100 USD in 10 days
(1 Review)

Dear Sir, We have the experience to develop your project! Please check PMB Thank You

$250 USD in 100 days
(1 Review)

Hello, I am an electronic engineer. I can help from a simple solution. Please see the PMB.

$70 USD in 2 days
(2 Reviews)

i can do this project

$250 USD in 12 days
(0 Reviews)

Hi. Have you tried to remove the USB stick ,with the WAV file, after it played the song ? I think this will make the cached wav file to be removed. If you'll plug it again it will read it again from the USB stick. I More

$150 USD in 5 days
(0 Reviews)

Hi, i am an Electrical Engineer and an Embedded Expert contact me.

$200 USD in 7 days
(0 Reviews)

Hi, I can do this. Please see PM.

$250 USD in 20 days
(0 Reviews)

Hi! I'm ready to do this job. I can make several versions of the product. All you need more detailed specification. I'm ready to make a real working prototype and send it to you by the delivery service ..

$200 USD in 20 days
(0 Reviews)

I have given you a simple solution.Just check if the same is acceptable.

$30 USD in 1 day
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