4X4 Array within Intensity Graph

[altenbach]

As I said, I cannot look at your DAQ configuration, and the use of dynamic data (which can be anything!) does not really help. Your express VIs are totally opaque to me, because I cannot look at them.

You seem to generate 4 bits of data into a boolean array (FFFF...TTTT) does this set the address of a single point you are trying to read with each iteration?

In this case you could do something like in the attached (look at the disabled case, you migh need a delay between the two express VIs)

[camerond]

I don't have your Elvis kit, but have you checked to see if it's working right? Maybe swap the Arduino outputs between the Elvis analog inputs (making sure the data coming from each is unique). It could be that you're not getting any data into Elvis #2. Or read only from Elvis #1, then from Elvis #2 - perhaps that multiplexing isn't happening. The problem might not be in the wiring on this VI, but the inputs to it.

Cameron

One other question comes to mind (about your first problem, not the new one), why are you starting with a 1D array and then reshaping it anyway? Why not just nest a couple of FOR loops and fill the array directly?

[HEAPO8]

Hi Camerond, Thanks the 1st problem has now been solved. On the 2nd problem, everything is okay from the hardware side. I know this because I am getting readings from both analogue inputs on the NI Elvis Kit II (I know this because it shows on the normal graph indicator). But on the Intensity graph, only the data for Analogue Input 0 is showing and not analogue input 1.

[HEAPO8]

Hi altenbach.

Thanks again for your reply. I can see from your example that your intensity graph is filling up the full 4x4 array. I tried to substitute my DAQ assistants into it, but again no luxck! Sorry, I really am a beginner at Labview. I have attached some screenshots of my DAQ assistants to let you know the configeration (please see document explaination).  I have also added some info on the Arduino 4051, just to let you know how it works. Please let me know where are should subsitute my DAQ assistants into your code If you need anymore info then just let me know, thanks alot for your help!

[camerond]

Just out of curiosity, could you just send a quick screenshot of your FP, maybe rearranging it a bit so we could see a snapshot of the first graph ("data"), the "output array" array, and the second graph ("Graph")? (I'm just a really visual thinker)

Cameron

[altenbach]

Well, you seem to read 100 samples at a 4K rate. Are you averaging this for each single measurement to be added to the array? (how else do you want to fit 100 points ot a an array of size 16? 😮

[HEAPO8]

Yes, 100 samples are averaged for each measurement (and these are the default settings). So any ideas?

[altenbach]

You don't show any averaging in your code. Please explain.

[HEAPO8]

This part of the code is really irrelevant to my problem.  The sample average is automatically done within the DAQ Assistant, I do not need to do anything within the code. I could shorten the sampling to a much lower number and the same problem would occur.

The Problem is viewing results from Analogue Input 1 (or Voltage_1) on my Intensity Graph. I can see Voltage_0 on my Intensity graph but not Voltage_1. There is nothing wrong with my hardware because I can see the data on the normal graph indicator, but not in the Intensity Graph

[altenbach]

What do you see on the intensity graph? A single trace with all 16 samples or two traces with 8 samples each? You simply need to bring it in a form of a  16 element 1D array or a 16 element 2D array with two columns. Either can be reshaped into a 4x4 2D array for the intensity graph. You don't even need the shift register.