How to output and control two different voltage levels from the single power supply.

[GoviRe]

Hello,

I am currently using a lab view programme to set the voltage and current of a power supply, whose output is used to drive a LED. Now, I want to make a programme that allows setting two different voltages from a single power supply so that these different level voltages can be used to set two different LEDs.

Is it possible to output two different voltage levels using single power supply by LABVIEW.

Can someone suggest an idea of making this with Labview or if any other method can be used for this implementation.

[Dennis_Knutson]

Sorry, but that makes no sense. If your supply only has a single output, how do you expect to get two different voltages from it? You have a hardware problem that no software can solve.

[GoviRe]

Ok, thanks.Then I will use dual output power supply for controlling two output voltages.

Can I know how to use my single output power supply programme for making a programme that will contain the control for two supplies by duplicating the single output power supply programme.

 

[Dennis_Knutson]

Aside from the obvious difference of needing to specify the channel numbers, how can you expect anyone to answer that? You haven't specified the vendor's or model numbers of the supplies. You have the manuals and should be able to determine differences in progamming.

[GoviRe]

Hello,

Now I am planning to use a single power supply to alternatively switch one LED at a time from the two LEDs available.I am working with the pulse signals where the circuit contains two LEDs and singel photodiode.Now, I am manually switching the supply to LED1 for some 'x' period and collecting the photodiode signal uisng DAQ.After some interval again I am manually changing the supply to LED2(Switch ON) while LED1 is in OFF state and collecting the signals of photodiode corrsponding to the LED2 through DAQ.

Can I implement this switching between LED's so that first LED1 should be turned ON for 'x'secs duration and the data is collected using DAQ with LABVIEW.After that 'x' secs duration  the LED1 should be turned OFF while making LED2 ON for again 'x' secs duration and data is collected.This programme run continuously or untill some condition(some 10'x'secs duration) is met.

Is it possible to implement the above if the power is supplied from a Battery source.

Thanks.

[Dennis_Knutson]

There is still a great deal of missing information. You say you need to switch connections to different LEDs. How is the switch supposed to take place? A manual move of the connection or an automatic one with relays/switches? If automatic, what sort of hardware do you have to control the switching?

Where the power to turn on the LEDs comes from is mostly irrelevant. If you are using a fixed voltage from a battery, then that is just a little less programming you need to do.

[GoviRe]

I need automatic switching but I am not sure of what is needed(relays/Switches) and the hardware(circuit) required for the labview implementation part.Right now,I am just manually changing the supply voltage terminals between the two LEDs.

Yes,I will be using fixed voltage from a battery.

[Dennis_Knutson]

What sort of DAQ do you have? If it has a digital output, you can wire it to a SPDT relay. You may need to use a current amplifier (i.e. ULN200x) to connect to the coil. Depends on the relay you choose and the DAQ card.

[GoviRe]

Hi,

I am using DAQPad-6015/6016.If possible can you provide any vi's and materials implementing this.

[Dennis_Knutson]

Just about the simplest DAQ function there is.