I have been tasked with (semi) automating flow velocity data collection using a pitot tube in a minaturized wind tunnel. The pitot is mounted on a two axis stepper motor system which is controlled by an arduino and manually moved with a GCode sender on a computer. The actual flow line is connected to an Ashcroft DPT with a 0.1 IWC and 4-20mA output. Since we don't have a variable current datalogger, we record the voltage over a connected resistor with a hydra fluke (variable voltage) data bucket and their proprietary software, which exports data to .csv files.
The only part of this system that cannot be changed is the pitot tube itself - everything else can be modified.
I am going to make the stepper motor system 3-axis then I would like to create a program that allows me to do the following:
- Position the pitot tube at a fixed location on any 2 axis and span the third at a fixed interval
- At each point on the span, pause movement and dynamically record ~25 data points
- (Optionally) also record capacitive current in another wire
- Save all data for a given run in a .csv file local to a computer
- If at any point the material on the plate being studied 'burns', it shorts a 20kV circuit. The power supply has a good overload shutoff system, but I would like this to also stop the automatic program
Currently, I am looking at using either an Arduino or NI MyRio for this system. Since there is no good way I have found to interface with the Hydra system other than their software, I would like to remove it from the system if possible. Preferably, I could measure current directly from the DPT (would probably also be voltage over connected resistor).
So to the question, I would prefer to use the arduino but I am not sure if it is possible to get high resolution data. The NI seems like a pain all things considered, but I am wondering if there is anyone who has input on this project before I dig deep in and find out there isn't a plausible way to do it with the selected device. Are there any reasons to choose on over the other or hardware/procedural suggestions which may improve the system.