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Targetry Discussion (Read 260 times)
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Re: Targetry Discussion
Reply #15 - Dec 15th, 2020 at 2:06am
 
IronGoober wrote on Dec 14th, 2020 at 9:46pm:
You might be able to do it cheaper with a variable resistor that rotates with the pendulum. You could use a Arduino/raspberry pi to provide a constant 5V through the resistor. Then you'd use some simple code to wait for a change then just read out the voltage min/max (depending on how the resistor changed) and have some other code to convert it to a force (via lookup table or just a multiplier) and then use a digital display to display the max value for some given amount of time before it resets.

I think that would work.?

Perhaps, but cheaper is relative, often shipping is more than what you're purchasing, I'm mid pacific where there's shipping monopolies and 20% tax on everything when it arrives. And always pot luck if you actually receive anything. In any case country has been in lockdown for 9 months and won't be opening any time soon, so I'll look more closely at it next year.

Load cell is designed for force testing, so no mucking around with rasperry farts and stuff Smiley
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Re: Targetry Discussion
Reply #16 - Dec 15th, 2020 at 2:11am
 
NooneOfConsequence wrote on Dec 14th, 2020 at 7:20pm:
This would work best with rusty balls where there is good energy transfer to the pendulum even when hit at odd angles.

Yes, that sounds reasonable. I got a while to think about it. Might weld up a frame and play with some mechanical ideas until I can do something more precise and digital.

For a start something simple that's just comparative would be fun for the kids to compete on. They wouldn't care about mass and velocity and newtons.... just who is hitting the hardest.
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