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#16
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Re: Dynamic Brake/Coast Modes?
I know we had dynamic brake/coast in our drive train on the 2012 robot, however I believe we used a spike to control the state on the jaguar jumper pins.
Don't believe it was even questioned during inspection at 2 regionals. |
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#17
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Re: Dynamic Brake/Coast Modes?
It had been assumed to be legal, including I'm pretty sure Al had used it and suggested it in the past. But if they found a hardware issue where high current could end up running though a legally allowed to be 28 AWG wire, it's absolutely the right call to make it illegal. Thats a good way to start a fire really easily.
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#18
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Re: Dynamic Brake/Coast Modes?
As promised previously, here's the Q&A so that when someone reads this in 2020 they can see the content:
Quote:
Last edited by GeeTwo : 28-01-2016 at 17:42. |
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#19
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Re: Dynamic Brake/Coast Modes?
Quote:
On the Jaguar (I cann't speak for the design of others, but I can for Jag) the current involved is that in charging the MCU's GPIO input. The GPIO input uses an internal (to the MCU) pull up which is on the order of 50 kohms. The isolator would only have to pull the input below VIL. Note that this opto isolator, like the one on Jaguar's PWM input, is inverting. |
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#20
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Re: Dynamic Brake/Coast Modes?
Quote:
In any case, I was thinking of using the phototransistor side directly as a switch between the center pin and the brake/coast pins. To do this, you would only need to know whether the jumper pulled the B/C pins up or down. |
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#21
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Re: Dynamic Brake/Coast Modes?
I have received reports from independent testing that jumper current is well under 10 ma in all controllers but it does vary from manufacturer to manufacturer.
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#22
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Re: Dynamic Brake/Coast Modes?
Thanks, Al. I'll file this one away as a post-season control project.
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#23
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Re: Dynamic Brake/Coast Modes?
Quote:
Quick example here also... https://github.com/CrossTheRoadElec/...bot/Robot.java |
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