Combining Signals from Multiple Analog Read Blocks to a Single Voltage Meter

[eng19]

I have an Arduino Mega board, which allows 16 (A0-A15) analog input connections. I have the first 5 (A0-A4) analog pins connected to circuits that include FSR sensors. I want a single voltage meter and waveform chart to show the output (in V) of whichever sensor is triggered, so I tried merging the signals from each analog in pin, then running the merged signal into a voltage meter and waveform chart. The problem is that only values from the A0 pin FSR sensor are showing up on the voltage meter. There is never more than 1 sensor triggered at the same time, so I thought the meter would show the value of whichever sensor was currently triggered instead of showing 0V at all times unless the sensor connected to A0 is triggered. I also added in an image of the block diagram I currently have if that helps make sense of what is mentioned above. I have a meter for each sensor connected to an analog input pin so I can make sure the sensors are actually working as they are triggered. When, for example, sensor 2 connected to A1 is triggered the value will show on A1's voltage meter but not on the merged sensor meter. I don't have previous experience in LabVIEW and have been reading up a lot on forums, but just haven't found anything that can fix this issue or let me know if it is even possible to do! Since the sensors work individually I know it is something with merging the signals that is causing the issue, not sensors that arent connected well or wired incorrectly. Thank you in advance!

[DavidWilt · Accepted solution]

Your issue with the merge signals might be because they are not all in the same time period.  Since you are doing 1-channel reads they will each have their own timestamp.

I am not sure if it is possible to do a multi-channel read in LINX but if it is that would optimize your code and give you what you want.  Or if not you can manually combine each channels read into a single time reference to give you the display you want but this would not completely be accurate as the time would always be from your reference signal.

[Tark]

I don't think that 'merge' is the function you want, it's probably an array or cluster that you need.......look at the examples for charts and graphs to find the one that suites.