Subject:
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Re: MOC: Working solar powered rover and geiger counter
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 8 Feb 2006 18:04:06 GMT
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Viewed:
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1660 times
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In lugnet.robotics, Justin Fisher wrote:
> The heart is a low input voltage (5V) CCFL inverter and a low voltage
> geiger tube. Geiger tubes normally operate at 900V +/- 20V, but some
> are designed for 500V, and most of these will start to operate in the
> 350V range.
I fear all I can do is gawk in astonishment. Getting a HV sensor to work off
the RCX is truly an amazing acomplishment. But you've gone well beyond that,
with the solar panel (I'd seen the earlier one on eBay), the powercan... and the
low-power mode for the RCX!! This last is perhaps the most amazing to me, and it
may be a modification I try to make. I'm curious if I could use this to "wake
up" an RCX on a schedule, or when certain events trigger, and latch the power on
until the RCX shuts itself off again (I'm thinking long-term monitoring of
environments for weeks or months). I'll have to poor over the schematics, but
I'll agree with Philo and others, very nicely documented.
Do you have documentation (OK, schematics, internal pictures, or hints and
tips on building them) for the energy cans?
And what type of solar cells do you use in the solar panel (efficiency?)
> you'll want something radioactive by the tube so you know the tube
> is active
I always used Colman lantern mantles for this (ever wonder why thy say "do
not handle ash, and wash hands immediately"? Th-232).
> I would prefer to be able to use a scintillator instead of a
> geiger tube, but geiger tubes only draw power when an event
> occurs, so their power draw is lower.
I thought you could hook up a crystal to a photomultiplier tube, but it's
been too long since my lab days.
--
Brian Davis
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Message has 1 Reply:
 | | Re: MOC: Working solar powered rover and geiger counter
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| (...) This would not be difficult - if you scroll down to the bottom schematic, it is colour-coded into sections according to function, with the last third of the circuit being all that you need to make a switch to activate and run the RCX from some (...) (18 years ago, 10-Feb-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: MOC: Working solar powered rover and geiger counter
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| (...) Thank you :) I don't have a schematic (more like a few pages of illegible notes :) and the gieger counter sensor isn't something that's easy to make a useful schematic for anyway because of unusual parts that vary in key properties, and the (...) (18 years ago, 8-Feb-06, to lugnet.robotics)
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