Subject:
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Re: Battery voltage available within NQC?
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Fri, 12 Mar 1999 03:23:01 GMT
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Viewed:
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2488 times
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In article <F8GEGC.H3K@lugnet.com>, "Murray Altheim"
<altheim@[remove-me]eng.sun.com> wrote:
> Last night I went out and bought six C cell nicads and wired them up
> as a power supply for my robot. What I'm wondering is this: is there
> some way to programmatically obtain the battery voltage, so I could
> make a decision based on a voltage threshold? Like changing the robot
> behaviour to begin searching for a charging outlet? I'd also like
> to be able to then unhook from the charger when the voltage reached
> an upper threshold.
>
> I know that the firmware seems to know about battery voltage, and
> returns the value sometimes when communicating with nqc. It's also
> available within the Mindstorms software. What would be the NQC code
> to obtain that value?
There's a bytecode (0x30) that instructs the RCX to send the battery
voltage as a response over the IR. That's what NQC and Mindstorms use to
read the battery voltage. I don't think this opcode has any effect within
a program, or at best it would trigger the RCX to broadcast its battery
voltage. I'm not aware of any way to read the battery voltage into a
variable from within the RCX.
Dave
--
reply to: dbaum at enteract dot com
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Message is in Reply To:
 | | Battery voltage available within NQC?
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| Last night I went out and bought six C cell nicads and wired them up as a power supply for my robot. What I'm wondering is this: is there some way to programmatically obtain the battery voltage, so I could make a decision based on a voltage (...) (26 years ago, 11-Mar-99, to lugnet.robotics.rcx.nqc)
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