design a VI to read volt

[Doraemon]

Hi all

Can anyone teach me how to design a simple VI for my cct below? I want my circuit to be able to measure an input pulse signal and also signal that are being amplify, then further to read different voltage that come from the different LEDs.(additional LEDs cct)  And to be able to read the volt ref automatically ,instead of using manually to adjust my variable resistor, as that part ,I intend to use a d/a chip to change the volt ref.Can someone advise?

regards

[devchander]

what is the hardware you intend to use?

do u have a multifunction DAQ card?

[Doraemon]

Yes i do have a daq card.Pls advise me how to start....thks so much

[devchander]

Hi,

From your circuit, I understand that you want to acquire from more than 2 AI channels and simultaneously generate an analog output.

Since you also speak of reading LED's i assume you want to read the boolean states of LED's in the same Program.

Just go through labview examples -> hardware input output ->DAQmx ->Synchronization -> multi Function section. Here you will find ready to use examples which help to achievce synchronised analog input acquisition and Analog output generation and also Digital Read/write.

Hope this gives you an idea on how to start.

Do get back if you need any further info

Regards

Dev

[devchander]

Hi

sorry, i forgot to ask in my previous reply.

You wrote in your query that you want to use a D/A chip for changing V ref

why is it?

Since the Analog output of your DAQ( its a multifunction card right??) will serve your purpose, why not use it?

[Doraemon]

Hihi,

I'm not sure what you mean by a multi function daq card. I think my is a 8 bit pci normal daq card.But I'm still confuse on how V ref can be read or adjust automatically?? Cause if I'm using a scope to read, I need to adjust my variable resistor in order to get an matching output which is being amplified. But in lab view, I don want to adjust manually my variable resistor, I want the v ref to be able to read by itself, so how do i do that? Ur help will be in great appreciation

[Doraemon]

Hi dev,

I'm using labview 7, but I cannot find any DAQmx inside my hardware and input folder, pls advise, is it because I need to have hardware install??

[devchander]

Hi,

You might not have installed NI DAQ device drivers.

Install this and tehse examples will show up.

if you hae installed NI DAQ  and still not getting daq mx programs, try this: uninstall Labview and reinstall it again and this time load both the NI DAQ device driver CD's when the pop up msg asks for it.

this should work

Regards

[devchander]

sorry for those awful spelling mistakes, i was typing in hurry! 🙂

but hope i convey the message effectively 😉

regards

dev

[Doraemon]

Thks. U mean I need to have the daq card 1st before installing the program? Once the program prompt for driver CD,then I put in it??