Subject:
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Re: Date/Time Clock for NXT?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Thu, 30 Nov 2006 21:09:51 GMT
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Viewed:
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13426 times
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In article <J9Jv4v.nDo@lugnet.com>, Dick Swan <dickswan@sbcglobal.net>
writes
>
> I don't understand the NXT hardware / schematic well enough to know
> whether this is possible. In particular, I suspect that the NXT may
> have circuitry controlled by the 8-bit AVR processor that disconnects
> all power to the ARM CPU so that you can't set the ARM into a
> low-power state. Anybody able to answer this question?
This question seems straightforward.
In the hardware schematic PDF that Lego have published there is a block
diagram of the "Power Block" on page 4. This does indeed show a
POWER_EN output from the AVR that switches power to the (5V) sensors and
the voltage regulator for the ARM. The detailed schematic appears to
conform to this.
If there was a RTC it could perhaps be synchronised to the PC over USB
or Bluetooth.
However I also suspect it will be hard to keep the clock running
accurately. Low cost crystal oscillators are not terribly accurate and
are quite temperature sensitive, so a few percent of error is likely.
Cheers,
Tony
--
The NXT Step blog discusses the Lego Mindstorms NXT:
http://thenxtstep.blogspot.com/
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Message has 1 Reply:
 | | Re: Date/Time Clock for NXT?
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| (...) I think so too. One solution to the problem would be an I2C clock "sensor", such as MindSensor's (URL) one is not directly adapted to NXT, but if there is some demand it would not be hard to do... Philo (18 years ago, 1-Dec-06, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Date/Time Clock for NXT?
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| A date/time clock would be a useful addition to the NXT. Naturally, it should continue to operate even when the NXT is powered "down". So here's a question for any hardware gurus that have a good understanding of the NXT schematic. The ARM processor (...) (18 years ago, 30-Nov-06, to lugnet.robotics.nxt)
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