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Old 02-20-2012, 12:51 AM   #5481 (permalink)
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as promised, here's some pictures of the enclosure and the install in the machine

as soon as i fix the links...

oh well. here's a flickr link

http://www.flickr.com/photos/76767049@N02/


















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Old 02-20-2012, 12:56 AM   #5482 (permalink)
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i'm using an HTFS-800P current sensor. i believe adam has the code, as i sent the board to him to program it. and then used his RTD explorer to set it up for my throttle input.
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Old 02-20-2012, 02:09 AM   #5483 (permalink)
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lem donated a couple of their current sensors, i asked them to send me two and they sent three. they are a pretty cool company. adam said the control board needs to be calibrated for the new sensor though to read accurate amps. also i noticed that at 12V, the pwm goes directly from nothing to 100%. i'm guessing it will be a lot smoother with higher voltage though
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Old 02-20-2012, 02:59 AM   #5484 (permalink)
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Yes, if you give it small throttle, it will try to do that same proportion of max current. if your max current is 1000 amps, and you do 10% of max throttle, it will ramp up pwm duty until you get 10% of 1000 amps, but that will never happen at 12v. It's a pretty easy fix to calibrate the current sensor.
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Old 02-20-2012, 03:01 AM   #5485 (permalink)
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maybe a logarithmic curve would be better than linear? i seem to remember reading something about some work you were doing on this kind of thing. might be really handy for such a light machine.
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Old 02-20-2012, 03:26 AM   #5486 (permalink)
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Not a bad idea. The throttle feels really smooth in a 2000 pound car, but might feel a hair touchy on a snow MOBILE! hahaha.
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Old 02-20-2012, 03:33 AM   #5487 (permalink)
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i can actually play with the throttle and hold the pwm at about 50%, but it's REALLLLLY touchy. the difference between 0 and 100 is so small you can't see the throttle move...lol. adam is gonna be there, maybe he can change it up for me after we drive it and see how it handles with the real batteries and an actual load on it
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Old 02-20-2012, 03:43 AM   #5488 (permalink)
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Adam is going to be in Alaska?!
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Old 02-20-2012, 04:00 AM   #5489 (permalink)
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we are both going to houghton michigan! we decided we might need him haha. he's taking monday off of work.
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Old 02-20-2012, 11:01 AM   #5490 (permalink)
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Quote:
Originally Posted by isaac_alaska View Post
we are both going to houghton michigan! we decided we might need him haha. he's taking monday off of work.
That should be fun.

Which version of the control board are you using in your controller?

The machine looks like a blast, and your work looks good!

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