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i forgot to mention two things..... for 30*30 m range ultrasonic wont work.. it work accuratly upto 3-4 m also while programmingn you will need ot keep a reference point for each pair

hi, i had made a project on ultrasonic sensors.. it used to detect and display on lcd the distance of the object kept in front of it and it worked pretty well... i too had thought of this idea of motion detecting.. well what you are saying can be done with the same circuitry... all you wl be needing is some more ultrasonic pairs.. (one pair for each dimension).... you wil have to do some extensive programming for the ultrasonic pairs to work correctly.. coz there are chance that the signals of one tx will be detected with the rx of some other pair giving undesired results.. in such case what you will need to do is operate only one pair at a time.... this will not onyl eliminate the chances of errors but will also consume less power.... and as the ultrasonic tx rx work at 40Khz you wont miss motion in any dimension...... all the data obtained from the tx rx pairs can be sent to the computer via a uController with help of some multiplexing technique..... you will also need to design a program to demultiplex these signals and convert them to the desired data for the anim software.. i have worked with some ani oftwares like poser, 3dmax, and swift3d but have never seen plugin or such sort of thing which can convert the data to desired animation... stil, all the best to you.. you have taken up a really big project!!

hi.. thanks for the help... but its the hardware part of the data trasfer where i am stuck at.. i want the device to be as economical as possible... using rf modules will be costly INRs. 600-700 or so (US $ 13-14) but the things will be much easier... on the contrary using IR wil be cheap.... will cost me less than INRs. 50( less than a dollar).... with the only limitation of line of sight and may be some errors too.. i guess operating IR led at a frequency of 40 KHz or so wil be quite good enough to transfer the song and artist info in less than a sec..... if you can tell me a better and cheaper way to send the data i wil be greatly obliged.. thanks once again...

hi.. i wanna make a wireless remote with a character lcd for my computer... what i want to do is display the name of the song or the movie that is currently being played... i am through with everything except the data transfer part.... i have no idea about how to send and recieve the text data... pls help! thanks

hi.. i wanna make a wireless remote with a character lcd for my computer... what i want to do is display the name of the song or the movie that is currently being played... i am through with everything except the data transfer part.... i have no idea about how to send and recieve the text data... pls help! thanks