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#31
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Re: How to power Mini-PC on robot?
I initially saw the rule (COTS device with Battery) as a power limiting concession, but can also appreciate how it is a safety issue (did the team design the power circuit correctly).
A COTS device that includes a battery is an easy bright line to enforce. If you allow teams to install any battery, then what are the rules on what can get a battery? If a fire starts because a custom battery circuit shorted out, how do you turn it off? I'm surprised that Samsung 7's weren't banned. |
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#32
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Re: How to power Mini-PC on robot?
Shh! Don't ruin it for us.
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#33
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Re: How to power Mini-PC on robot?
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People aren't asking for "any battery" to be legal, just USB batteries of some shape or form. These are common devices, with a known output plug, voltage, and current. A restriction saying "COTS batteries that output 5V power over USB at 2 amps or less and 10,000mAh or less" for example would be reasonably narrow, wouldn't result in these strange nightmare slippery-slope kids-wired-a-battery-at-home-using-bare-copper scenarios people keep jumping to, and would fix this and many other problems. |
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#34
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Re: How to power Mini-PC on robot?
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#35
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Re: How to power Mini-PC on robot?
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#36
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Re: How to power Mini-PC on robot?
Wow, 3 pages of replies to the poor guy that needed to source a weird power supply for his mini PC. He must be getting lots of help, I probably don't even need to... Oh.
So team-4480, have you gotten any more info on the stock power supply? I'd love to help you figure out an off the shelf solution for powering that. |
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#37
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Re: How to power Mini-PC on robot?
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I did some searching on bypassing the "smart power plug" and there are some people suggesting that it has been done just to wire in a 2K resistor to the positive side and a capacitor to the negative and feed that into the white wire. Apparently, that white wire wants something like 12-13V. Last edited by team-4480 : 24-01-2017 at 20:20. |
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#38
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Re: How to power Mini-PC on robot?
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At any rate, this car charger will probably work. It's listed as compatible with the same laptops that your stock charger is compatible with. It has to be a boost charger of some sort, though there isn't a guarantee of how low an input voltage it'll work with. Still $20 for a potential off the shelf solution seems reasonable to me. |
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#39
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Re: How to power Mini-PC on robot?
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Also, the charger states it can go from 11.5V to 15V so it should work no problem as long as we have a full battery. Or maybe it may be worth to get booster to 14V just to be sure....we will see after actually testing it on the robot. Thanks! |
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#40
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Re: How to power Mini-PC on robot?
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The charger might be specifying 11.5V just because that's an expected auto electrical voltage. Maybe buy one of those giant 6V lantern batteries and hook it up to that and see if it still puts out 19.5V? If not you might need a separate DC-DC that can boost 6V up to 12-14V. Which is starting to sound complicated, but I'm not the one who chose a PC that needs a smart pin power supply... |
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