NI9237 Load cell measurement in basic C

[scootergarrett]

Hello,

Sorry if this is in the wrong location as I'm trying to develop a program in basic C and this says (VC++).

I've got C code that works with so many other NI DAQ chassis cards (NI9210 - thermocouple, NI9216 - RTD, NI9482 - Relays exc.) but I can't seem to get a code example to work the the NI9237 load cell card. I think its got something to do with the DAQmxCreateAIBridgeChan function.

how I'm using the function to set up the channel:

error = DAQmxCreateAIBridgeChan(taskHandle, "cDAQ1Mod1/ai0", "", -2.5, 2.5, DAQmx_Val_Volts, DAQmx_Val_FullBridge, DAQmx_Val_Internal, 2.5, 350, NULL);

When I run the program it outputs error number: -200077

chat GPT says that from the channel name not recognized, but I have copied that name right from NIMAX (the same as for the other cards that work fine)

Is any one really good at using the NI equipment in C that could shed some light on this problem? or is everyone going to tell me to just use a different programing language.

Thanks

also portions of the NI website are in Spanish is this just me?

[rolfk]

ChatGPT? Really??

One thing that seems to really be different would be the limits. Your code uses +~ 2.5 but in your image you show 25m, that’s a factor of 100! And certainly to much for a bridge input like this. Also check your Val_Volt constant. That might be not the right one for V/V.

[scootergarrett]

Thanks for the hints. changing the minVal and maxVal in DAQmxCreateAIBridgeChan from 2.5 to .025 helped, then I got some errors about needing a sample clock. I worked through those and now have some working code attached. Every .5s it pulls in all the available data and prints out how many samples and the average value.

Thanks again. Still not sure why this website has a mix of Spanish and English.

[rolfk]

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@scootergarrett wrote:

Thanks again. Still not sure why this website has a mix of Spanish and English.

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Something in your local settings, possibly in your Windows settings, maybe in your account settings on your profile here or some cached data in your browser cache.

I have it all in English, but some pages like to default to Dutch for some reason, somehow detecting from where I connect.