aginor

Yes ShaunR, thats the point!!! we must not change anything. the system will think that this is a scaner. we dont wont to write any drivers or special programing. just one VI with input 2 parametes: posision and speed! a total free XY table.(if you use 2 old and useless scanners)

hi, i want to use the scanner mechanism as a x axis. if i conect 2 scanners i have a cheep xy table for experements!!! i think that scanners have an internal PID controler and the only data that takes from the PC is just the possision and the speed. i dont care about the image. this is not like the other projects that soneone wants to take the image in the LabVIEW. Please, help!

QUOTE (Minh Pham @ Oct 17 2008, 05:21 AM) correct QUOTE not give you exactly 100ms everytime and this is true. how i can convert is time to be m/s i am measuring the time of the circle by the tick count. and then what i have to do??

as you see in the image i am ploting the results of the sine derivetive in the "waveform chart" the chart shows the speed of the sine. know i am putting the amplitute of the sine in one "siftregister". If i subtract the two "siftregisters" i am finding the dx the same procedure for the time too. with this i am finding the real dt. this is an example, my real VI is too big and some times i am out of time...... then i divide this 2 and i am making the dx/dt, the speed but not m/s!! it is m/100ms!!!. this is diferrent from the other derivatite. for my aplication i need the speed. The average speed in m/s that "happens" between to circles!!!! how i can mesure it?? thanks from the begining. i make a VI with inteligents!! i will explain later........