Paul & Sabrina's cheap DIY 144v motor controller

[squiggles]

Originally Posted by MPaulHolmes

I found the perfect logo!

Now that is just ReVolting.

[dlaing]

Paul,

Not disabling the interrupts in this case is probably fine. Copying an integer is probably an atomic operation (meaning it's not a divisible operation, i.e. it can't be interrupted.) And it doesn't matter if it interrupts between the copies.

I can't wait to hear how the new code controls the car.

David

[MPaulHolmes]

Hey David! Don't you mean you can't wait to SEE how it controls the car? hehe. Here's a quick video of the new controller in action. I have absolutely no complaints about how it drives. It's very smooth. I tested it yesterday with average current proportional to throttle, where the average current is the running average of the last 16 current reads. I'm using a virtual pwmDuty variable that has a range of 0-2044, which I round and map onto 0-511. The pwmDuty variable is updated each time the throttle is read, which is about 1000 times a second.

Just like dlaing originally suggested, there is no more waiting for Analog to digital conversions to finish. Instead, an interrupt just happens when an A/D conversion is finished. The chip is running at 16 MHz, and the A/D clock is now running at 500 kHz, which makes for a very smooth throttle.

video

[nubie]

If we could keep the aptly named Kim Jong (making me) Il out of this thread it would be great.

That looks great, seems very smooth, now send one to Ben so he do burnouts and acceleration tests

I am very impressed, only it looks very expensive, which isn't a downside, it is open and featured after all, and PCBs don't cost all that much. Maybe I meant to say it looks very professional. Scaring me off a little, I don't like working on stuff that looks like art, I need hose clamps and duct tape in my creations.

So my only complaint is that it looks too good. Hmm, carry on!

[watt-a-mezz]

Paul, Looks like its a good one! It would have been a real good test with a faster stretch of road, but the acceleration was smooth. Was that with the aluminum or copper heat spreader? (how did the sqaure blue mom thing do?) Just razzin ya. Keep up the good work! Watt

[Tango Charlie]

"Nothing's blown up yet...so that's good."
Ha ha!

[jyanof]

just awesome!

[MPaulHolmes]

I think it's a STROKE of genius to keep that one naked guy out of the thread. (get it? he had a stroke? hehe)

It was the copper heat spreader. To be honest, I just didnt' want to break the controller. I would rather have Joe break it, since he payed for it. I'm sure it will be fine, well, pretty sure. I know of several ways to deal with heating issues in future versions if it's a problem.

[slurryguy]

Congratulations Paul, Joe, et al...

It didn't sound like you had much of an EV Grin going, Paul. It sounded more like New Controller Clenched Teeth Gitters.

You're doing great. Don't stress it. Enjoy the journey.

[watt-a-mezz]

Well, Joe now I guess it is your turn. Just rememer to release the e brake before you do any burnouts! (Ben tried it ) Good Luck and looking forward to the results. Watt