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 (<$50), preferable using or modifying hardware that is available off the shelf.

If you think you have an approach that might work, please reply with costs involved so we can discuss further whether to proceed or not.

If you don't have hardware only solution, I will consider a software/hardware solution provided the software is very simple to install, does not use a lot of system resources, and works with different versions of Windows so there is no compatibility issue. Thanks!

If using USB speaker, I don't want to have to switch between speakers - this would be interfering with the normal usage of the speaker.

Taidot: sähkötekniikka, elektroniikka, Sulautetut ohjelmistot, Mikrocontroller

Näytä lisää: led wav turn, what does purpose means, turn to 10, on line money making, network after work, hardware resources, a one computer, turn in to, playing, light force, Led, hardware development, operational works available, write computer network, flash wav, wav file read, usb flash program, sound solution, read wav file, setting windows network

Tietoa työnantajasta:
( 0 arvostelua ) Gloucester, Canada

Projektin tunnus: #3975093

11 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön


hi, i can help.

$550 USD 20 päivässä
(51 arvostelua)

I can help you please see portfolio

$250 USD 5 päivässä
(24 arvostelua)

I've done this before for another client, see PM for details.

$400 USD 25 päivässä
(1 arvostelu)

Hi, I liked your description and the way requested for the solution. Please see the PM below.

$100 USD 10 päivässä
(2 arvostelua)

hi, do you need a professional help?

$200 USD 5 päivässä
(12 arvostelua)

Hello, I am interested in your project. Please check your PMB. Thank you.

$200 USD 15 päivässä
(3 arvostelua)

Hi Sir ! Please read the PM with my idea

$350 USD 20 päivässä
(1 arvostelu)

i can help

$200 USD 30 päivässä
(0 arvostelua)

Hi, i have done a similar project.

$200 USD 7 päivässä
(0 arvostelua)

i will help you on this project pls PMB.

$200 USD 10 päivässä
(0 arvostelua)

Hi! I have a cheap solution for you.

$200 USD 3 päivässä
(0 arvostelua)

Hi, I would like to help you out, please see PM.

$250 USD 20 päivässä
(0 arvostelua)