So I started this months ago, fully aware that this time around I would have to put in all the time building the data acquisition computer that I had skipped during my
first rocket build. I knew that it would be a challenge. Now I know, I had no
idea.
@TLDR Don't bother. Just buy a usb NI-DAQ 600X on ebay for less than $250. Set up your load cells, collect your data, and get it over with.
Now back to don't bother... I tried everything. I bought every arduino known to
man. Then I hooked them all up and created archaic forms of multi-core
multi-threaded processors with amplifiers and signal conditioners, one Chinese
microcontroller + 2 months of shipping at a time. I spent a whopping $50 so far
for a box of basically useless micro controllers that I have been able to get
down to 497 Hz refresh rate. What a joke.
I have been building headers and bit banging my code over to a windows and then a Linux cpu. I have NI fpga's, computational servers, professional licenses for LabView and Matlab, experience writing Java and C, these are just some of other resources at my disposal for prototyping and I'm telling you now... 16 bit resolution at 200k samples per second is all you need and if not, reconsider what you are doing.
I bought the biggest and best micro processors and then coded them from scratch to no avail. The 2, 3, $400 dollars that NI costs is very worth it. I wish I could tell you I'm biased because I'm doing a review but no. It's just the truth, don't reinvent the wheel. There are no wheels in a rocket.
I have been building headers and bit banging my code over to a windows and then a Linux cpu. I have NI fpga's, computational servers, professional licenses for LabView and Matlab, experience writing Java and C, these are just some of other resources at my disposal for prototyping and I'm telling you now... 16 bit resolution at 200k samples per second is all you need and if not, reconsider what you are doing.
I bought the biggest and best micro processors and then coded them from scratch to no avail. The 2, 3, $400 dollars that NI costs is very worth it. I wish I could tell you I'm biased because I'm doing a review but no. It's just the truth, don't reinvent the wheel. There are no wheels in a rocket.
@NationalInstuments Please give me a sponsorship.
I will use the arduinos for all of the automation and electronic and pneumatic controls. I also plan to use the HX711 24-bit ADC load cell converters for the tanks because 100 Hz resolution is more than enough and at 24-bits I will be able to see femtograms apparently. For these I will have 3 arduino nanos embedded in the stand and they will communicated to a central arduino mega to report ambient conditions, tank weights, and switch/relay status via Serial. I will pick up the serial stream in LabView and use it to actuate some indicators and dials. I will keep you updated as I make this important, stress-relieving shift.
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