I made engine tester based on arduino. I would like to ask you, if someone/something does exists ? I found only too expensive commercial project: https://www.rcbenchmark.com/.
My cost only few $$ and I dont know if Im missing something. Here is what Im doing:
(ACS712 20A, resolution 40mA) on ESC input, current measurement is tricky - the value is really unstable so Im doing averiging from 300 values but still... it needs improvement [$2]
So I can calculate:
I used Arduino UNO copy with LCD + buttons shield [maybe $10 ?] + extra potentiometer. There are two modes:
My motivation is compare ESCs, motors, propellers to get best combination. The tool is mounted on my table during measurement so there is a lot of space around. I know it is not exatly as during real flight but still, it is good to compare.
Are you interested in or am I doing something what exist or is useless ?
btw sorry for my english..
project website: http://diy.ivosch.cz/buzz-drone-engine-tester/
Thanks, but it is not so powerful.
I'm sending data through Arduino USB, so it is easy copy and paste table from Serial monitor to Excel. In the future I would like to implement RPM sensor + maybe microphone to measure noise.
I believe I've already done all what you describe, and more.
Basically same as you thought of , 5kg load cell, capable of power module , or hall-effect sensor, and has serial output.
I'll open source it on github when I am back from vacation, (saturday) - then I hope we can take it further by people
like you contributing, rather than reinventing it :)
Correction, I see that yours are quite well operating, so you may actually have a equal or better solution.
It's very useful as g/W is a good indicator of everything including ESC firmware and settings.
I did not find vibration measurement very useful, but have another, better idea that would I've the open source versions we have , have something no meter has today.
Nice job, it looks similar. How do you measure current ? For me it is hard to get effective value when ESC is switching 3 phases.
I want to measure vibrations to see how propellers are balanced. Because of this the motor has to be mounted on the real arm... to get real behaviour.
I am using power module, and sample +average it a lot, used ACS758 hall sensor too, needs a bit finer filtering.
As long you have a power source, (lab psu or battery), then current measuring device, then some 15cm cable length before esc (with sufficient capacitors, then the current is smoother.
this is a great diy work!
would you share a build tutorial and arduino code?
My version will be on github next week.
To get usful comparison values you really need RPM mesurments
if you compare ESC's with same motor and same prop you can get verry different values at the same input pwm
That is true, every ESC has different throttle calibration and behavior. But to compare ESC's actually I don't need RPM. What is important to me is max thrust and efficiency. To compare efficiency is good chart efficiency vs thrust which I can create. When you use same propeller then thrust corresponds to RPM.
I will try to prepare simple tutorial "how to build" with source codes in the next week.
I created a video how works automatic mode: youtube.
Good Job Ivosch! I have done this manually with eagle tree logger and scales for years and now it's time to automate it like you did. Expecially the auto excel data export is really usefull! Will you share the source?