DAQ modification for TTL input

[Gabrielle Siemonsmeier]

Hi everyone,

I inherited a DAQ that had been modified to add an additional BNC port to take a TTL input (see attached pictures). I have another unused DAQ PCB that I'd like to modify in the same way. I was wondering if anyone had any tips/tricks/instructions on how to do so, or a list of appropriate hardware to use?

Also, I asked a while back about using a BNC to SMA adapter to run a TTL input through a DAQs digital i/o ports. It turns out the Labmaker DAQs I have are not 5V tolerant, so I'd need to use a voltage divider to drop the voltage of the TTL signal from 5V to 3.3V volt. Again, any tips/tricks/instructions on how to implement that would be a huge help!

Cheers,

Gabrielle

[ONE Core]

Tips and tricks here: https://optogeneticsandneuralengineeringcore.gitlab.io/ONECoreSite/projects/Miniscope/

Sparkfun offers a dead simple way to convert 3.3 to 5V (bidirection logic level converter). https://www.sparkfun.com/products/12009

You will need to pull constant 3.3V and 5V from somewhere. You could use outside power supplies (tie all grounds together) or pull from the board. Initially I see 3.3V on TP2 and 5V on the USB Coax jumper. There might be easier places to pull from. I might make this a project to make it more simple, but here ya go!