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In lugnet.robotics.handyboard, Dr. Kevin Nickels writes:
> I've got a pre-assembled Gleason Research HB with expansion board, and
> have a
> couple questions. We've left it plugged in (on normal charge mode) for
> a week or so.
Ouch. You don't want to do that too much or you will torch (may have
torched) your NiCds. NiCds do NOT like to be overcharged, it causes a problem
called Voltage depression that many mistakenly call "memory effect".
[snip]
> The HB seems to work just fine, but I'm concerned about hooking up my 6V
> servo to a 10V sourse. I've yet to load the servo ports with a resistor
> or something to see if that brings it down, but even with a 0.7v/diode
> drop, we'd be significantly high.
Servos will pull up to 300ma at high loads, so a drop resistor may not be what
you want to do. I have used hacked servos at up to 12V for 5+ minutes at a
time with them only getting a bit warm. Are you measuring your voltage at the
ports with the charger plugged in? This will raise that voltage a bit if you
are. How many cells are in the battery pack? Regardless, hobby servos will
happily chug along on as much as 7.2V for as long as you need them to. If you
are concerned, or are using expensive servos, just put a couple more diodes in
the circuit, but make sure they can handle 300+ma loads, and remember that that
voltage will most likely drop under load.
have fun,
DLC
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Message has 2 Replies:
 | | Re: Overcharged battery?
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| no i disagree with this answer. the HB is designed to be left on normal charge indefinitely. the batts can get a little warm. if they are hot then something is wrong, but a little warm is nothing to worry about. when fully charged and with no load (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
| | | Re: Vector 2X driver
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| I just bought a Vector 2X electronic compass for a project. In looking at it the manual, I see that if the 2X is run in slave mode I can clock out data from it at my leisure using any digital pins available on the Handy Board. This could almost be (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Overcharged battery?
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| I've got a pre-assembled Gleason Research HB with expansion board, and have a couple questions. We've left it plugged in (on normal charge mode) for a week or so. I started to look at the specs to hook up a Futaba servo (6V), and found that with no (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
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