Cheap Audio Module

Hello,

I'm brandnew to embedded programming, although I've done some minor programming before. Since I have no idea yet, how the arduino works, which boards and microprocessors I need etc., I will read this document first: http://math.hws.edu/vaughn/cpsc/226/docs/askmanual.pdf.

However, I've been searching for similar projects like mine and found some existing solutions - not exactly the same, but similar.

What I want to do is a simple, cheap and tiny Wifi audio sender module. Usually the price of existing solutions is too high for this project, since I want to install 5-10 in my house for speech recognition. The module should only contiuously send the received audio signal to a PC running linux, which then processes the signals.

So I was wondering:

.) What is the cheapest/smallest board I can use for that project?
.) Which cheap wifi modules and microphones compatible with arduino are available?
.) Is it possible to stay below 20 Dollar per board?

Thanks in advance!

8 wireless mics & central receiver. $36.50/mic
No arduino needed.

http://www.parts-express.com/pyle-pdwm8400-8-mic-vhf-wireless-microphone-system--248-4334

Individual mic's

CrossRoads:
8 wireless mics & central receiver. $36.50/mic
No arduino needed.

http://www.parts-express.com/pyle-pdwm8400-8-mic-vhf-wireless-microphone-system--248-4334

The mics are way too big and with $36.50 almost twice as expensive as I was looking for. However, the audioquality would be great I guess :slight_smile:

CrossRoads:
Individual mic's
http://www.parts-express.com/pyle-pdwm96-lavalier-wireless-microphone-system--248-4338

This looks much more promising. Thanks for the link!

edit: well, maybe not so good. Each sender needs one receiver which has to be plugged into the PC.

Or plug each receiver's output into a mixer, and feed the mixer output into the audio card on the PC.
You can buy one,

or you can make a simple mixer with just resistors and an op amp.

What's your time worth?

CrossRoads:
Or plug each receiver's output into a mixer, and feed the mixer output into the audio card on the PC.

Hi CrossRoads,

thank you for that option, but to be honest: that was not what I was looking for. I would need a solution, where each module is very cheap and very small.

I would have the approach to install the raspberry pi with a wifi dongle and a microphone - that would be very easy for me I guess. I haven't used a mic on the raspberry so far, but I think thats not a difficult task. The thing is, the rpi (Model A) costs around 25 dollars, a wifi dongle 10 dollars, a power supply 5 dollars, a mic 5-10 dollars and a case 5 dollars, which is around 50-60 dollar for each microphone station. I would love to have around 10 stations in my house which would cost 600 dollars. Thats not cost efficient, and I would use my other option to apply background speech recognition on my phone which I carry with me all the time.

Then I heard from arduino and I thought this would be a nice option to get a cheap, small board which is also fun to play with. I know 20 dollars is very hard to achieve, but thats the goal at the moment.

What's the distance from each mic location back to the PC?

Here are examples of WiFi modules - they don't look that inexpensive to me.
https://www.sparkfun.com/search/results?term=wifi
Perhaps there are other units available.
You can check at www.adafruit.com and www.pololu.com for other options.