Robin2:
You did not say in your Original Post that you wanted to send the data by wireless to a PC. I had assumed you wanted to send it to another Arduino. That is also why I wasted my time making comments about generating sounds.
^I'm really sorry about wasting your time... I guess my explanation was unclear. I'm actually still unsure about the set-up of the project's system itself, so I might be explaining things in a wrong way. I really appreciate your input and time though, because I am learning a lot of things from everyone's reply. Again, I'm really sorry.
I'll try to clear things up here - yes, I did say that I want to send the data gained through the accelerometer to an Arduino. It's because I thought that the only way to process the data (play sounds/melodies according to the accelerometer's data) was through sending the data to an Arduino first. As in, I was imagining of the system being:
Accelerometers & Arduino & Wifi modules <---> Wifi module & Arduino & MIDI software (Max MSP, Processing, etc..) & Speaker
OR something like:
Accelerometers --Wifi modules---> Arduino -> Wifi modules <---> Arduino <-Speaker.
Initially I thought I can just connect the accelerometer to the wifi module, and have another wifi module that's receiving data from the accelerometer, and connected to an Arduino that's connected to a speaker.
However, after getting replies here, I realised that for this project, the PC's Bluetooth capability can replace all the complicated coding/configuration for a speaker. So it can be like:
Accelerometers -> Arduino -> Computer with MIDI software (Max MSP, Processing, etc..) running & playing sound <---Bluetooth---> Speaker.
Robin2:
Most PC's have WiFi included and I don't know of any that have 433MHz wireless.
However most PC's also have Bluetooth and it would be a great deal easier to use than WiFi unless you are already familiar with web programming. Bluetooth is just serial-by-wireless.
^Ok, so you are saying, I can use the Wifi module to communicate the data I got from the Accelerometer to my computer wirelessly, but not with the 433MHz RF Transmitter/Receiver - am I right?
And I'm guessing you're also suggesting that it's easier to use a Bluetooth modules like HC-05 to send the data to my computer, rather than using a Wifi module? That's a really good idea, but the thing is, while I own multiple Wifi modules already (I ordered them a few weeks ago), the Bluetooth modules can be quite expensive. Since I am going to gain data from about 10 or more accelerometers, thus 10 or more "wireless" modules, I am hoping that there is a way for me to use the Wifi module, or the cheaper option 433MHz RF Transmitter/Receiver.
Bringamosa:
Not sure what is needed here not clear for me. But, one big difference is the frequency they work on.....
I have experience with 344mhz modules. The cheap Chinese ones. You have to lucky to get a good one. I have one module failing over 3 meters disagree and I have one working over 60 meters whit the receiver behind a concrete wall.
So just a fair warning about those...
^Hey, sorry my questions/posts are really messy and unclear - I'm super confused about this whole project!
Right, frequency! That's the thing I don't understand. Like how are they different in frequency(?) compared to Wifi modules??
But okay, if the 344mhz modules are not very reliable, I might go with the Wifi module. Thanks for letting me know 
dave-in-nj:
your sketch shows where you want to put the wireless.
but your video does not show any need for wireless.
also, the video shows a Theremin style
https://www.youtube.com/watch?v=57S3dylfw3I some guy named Massimo Banzi...
why are you discussing sound ? I thought you wanted to figure out how to best use wireless ?
what is the distance ?
what mediums do you have to go through ?
is this all line-of-sight ?
battery powered ?
^You are right. The video is just an inspiration of what I want to do. So basically I want users to play with/touch/move the accelerometer, and play sounds. However, my work won't be embedded in the ground, and instead be an object to be held in hand. And I want the movement of the hand to be big - almost violent, so it would be great if I can make it wireless. As of now, my accelerometer & Arduino is connected to my computer via USB cable, and I want to get rid of this cable.
I was discussing sound, since I wasn't sure how I was also going to send the sound wirelessly to the speaker, from the inputs of the accelerometer. But I think that's sorted now, because I decided to just send data gained from the accelerometer to my computer (wirelessly), and make a sound using a MIDI software inside my computer, and then sending the sounds to a speaker via Bluetooth. Sorry about asking all these stuff in one forum - maybe I should have separated it.
what is the distance ?
Distance between the accelerometer/Arduino to my computer would be about 2-5 meters.
what mediums do you have to go through ?
Mediums, as in obstacles between the accelerometer/Arduino and my computer? Nothing. Everything will be in the same room.
is this all line-of-sight ?
Sorry - I don't really get what you mean by "line-of-sight", but if it means if it's in the same room/space, yes. My computer, Arduino/Accelerometer, Speaker, everything in one room.
battery powered ?
Yes, since I want to create like a wireless 'object', with no cables connected to a powerpoint or a computer.
My question boils down to, I guess, what would be a good way to send data gained from accelerometer (that is connected to an Arduino Uno board) to a computer wirelessly?
