Bitstring <[email hidden]>, from the wonderful person Fran <[email hidden]> said
Quoted message said:
[email hidden] said...
Quoted message said:
The problem with a simple light sensor ?? 6 feet of snow ...
On top of a lamppost??
OK then, use a timer.
That's what it is, but a timer which varies the times according to the date and the latitude/longitude (if you look up the equations for sunset and sunrise you'll see why a 1980 vintage 4 bit MPU might have trouble with the math).
-- GSV Three Minds in a Can Contact recommends the use of Firefox; SC recommends it at gunpoint.
Message-ID: <[email hidden]> from GSV Three Minds in a Can contained the following:
Quoted message said:
The problem with a simple light sensor ?? 6 feet of snow ...
At the top of a lamp post? A small heating coil would keep it clear.
-- Geoff Berrow (put thecat out to email) It's only Usenet, no one dies. My opinions, not the committee's, mine. Simple RFDs http://www.ckdog.co.uk/rfdmaker/
On Fri, 10 Feb 2006 19:02:57 +0000, Geoff Berrow <[email hidden]> wrote:
|Message-ID: <[email hidden]> from GSV Three Minds in a |Can contained the following: | |>The problem with a simple light sensor ?? 6 feet of snow ... |At the top of a lamp post? |A small heating coil would keep it clear.
Simpler than that, they mount the light sensor in a small pyramid on top of the street light so the snow just falls off. Take a look they are obvious when you know what you are looking for. -- Dave Fawthrop <dave hyphenologist co uk> Please quote, with quote character, previous post sniped to only the bit you are replying to. Threads often contain 100s of posts dozens layers deep. Other people use different newsreaders, they do not see or do what you see and do.
Bitstring <[email hidden]>, from the wonderful person Geoff Berrow <[email hidden]> said
Quoted message said:
Message-ID: <[email hidden]> from GSV Three Minds in a Can contained the following:
Quoted message said:
The problem with a simple light sensor ?? 6 feet of snow ...
At the top of a lamp post? A small heating coil would keep it clear.
I did say these were consumer units, so no guarantee they would be on top of a lamppost. And you're supposed to use your imagination - for 'snow' read 'soot' ' bird [censored]', whatever. And it might not be such a small heating coil, if you're selling them into Sweden and Finland ...
-- GSV Three Minds in a Can Contact recommends the use of Firefox; SC recommends it at gunpoint.
The problem with a simple light sensor ?? 6 feet of snow ...
Quoted message said:
On top of a lamppost??
Not a problem. Snow falls on sensor. Sensor thinks it's dark. Light comes on. Lamp heats up. Snow melts. Problem gone.
Fly away Peter, fly away Paul...
Those lamps came on under a dull sky tonight, one after the other again, starting three minutes after sunset, all within one minute or so. I think that there has to be a timer to apply the power at sunset, after which each lamp 'decides' for itself. That concludes my observations. 😉 -- Gordon Harris
> The problem with a simple light sensor ?? 6 feet of snow ...
Quoted message said:
On top of a lamppost??
Not a problem. Snow falls on sensor. Sensor thinks it's dark. Light comes on. Lamp heats up. Snow melts. Problem gone.
Fly away Peter, fly away Paul...
Those lamps came on under a dull sky tonight, one after the other again, starting three minutes after sunset, all within one minute or so. I think that there has to be a timer to apply the power at sunset, after which each lamp 'decides' for itself. That concludes my observations. 😉
One particular set near me were full on this afternoon in bright sunshine. I dare say the went off this evening when dark descended though. -- To reply see 'from' in headers; lose the domain, and insert dots and @ where common sense dictates.
Fran <[email hidden]> wrote: > [email hidden] said...
>> The problem with a simple light sensor ?? 6 feet of snow ...
> On top of a lamppost??
Not a problem. Snow falls on sensor. Sensor thinks it's dark. Light comes on. Lamp heats up. Snow melts. Problem gone.
Fly away Peter, fly away Paul...
Those lamps came on under a dull sky tonight, one after the other again, starting three minutes after sunset, all within one minute or so. I think that there has to be a timer to apply the power at sunset, after which each lamp 'decides' for itself. That concludes my observations. 😉
One particular set near me were full on this afternoon in bright sunshine. I dare say the went off this evening when dark descended though.
