Constant Voltage output from DAQ

[JordanConte]

I am currently stuck. I need to have a DAQ interface through LabVIEW and output a constant Voltage. not a signal. Basically, I need it to activate a relay once I activate it in LabVIEW. is this even possible? I have both a Digital IO DAQ and an Analog IO DAQ.

[GerdW]

Hi Jordan,

which DAQ devices are we talking about?

Do you use DAQmx devices?

Generic answer: yes, it's possible. The DAQ device needs to supply enough current to drive your relay - or you use an amplifier...

[crossrulz]

What relay and what boards are you using?  You might have an issue with output current not being strong enough for the relay.

[JordanConte]

I am using an Altronix Phenolic or Fiberglass Relay Module 6/12VDC 120Ma DPDT. 

[GerdW]

Hi Jordan,

what about the questions on your DAQ hardware?

Any datasheets of the relays?

[Bob_Schor]

You want to "activate a Relay", i.e. you want to deliver a digital signal, "Relay On"/"Relay Off".  You can generate this with a D/A converter, but it is much simpler and more logical to do this with a Digital I/O port.

However you generate this (digital) signal, you need to use it to activate a Relay, which means it must generate sufficient current to drive the relay.  Many DAQ devices, particularly DIO devices, have rather low Current drive, while many electro-mechanical devices, such as Relays, require modest Currents.  This can often be accomplished by a one-transistor circuit and an external 5v Power Supply.  Talk to an Electrical Engineer (beyond my expertise!).

Bob Schor

[JordanConte]

got it! thank you so much for the help. I utilized the DAQ assistant to send a logic high of 5V to the relay when I need it to activate