>
> On Feb 18, 2008, at 1:18 PM, Jinx wrote:
>
>> would this work through 60mm of cured concrete ?
>
> Sure, but water / dampness spoils performance, so you'll have
> to watch that. It's an easy circuit to experiment with, give it a go
>
> I found the BiMOS CA3130/3140 worked well, better than
> other common, and cheaper ;-( , amps of the time. It's a project
> I'd like to re-visit at some stage (it can just join the queue), new
> commercial applications have emerged
>
>> I make concreto countertops with embedded clocks
>>   and I would like to embed sensors in them.
>>
>> See a not-very-good uTube video.
>> http://www.youtube.com/v/dNsjyZ4yAHc
>
> Couldn't quite make out the Hours / Minutes designation. Dual-
> colour LEDs ?

Duh  I am smacking my forehead.  Yeah, I think I should use dual- 
color LEDs.
Right now I am using fluorescent orange light pipes so that  
replacement of
LEDs would be easy.  I could switch to clear light pipes.  Then the  
color
could vary a lot ( even use RGB LEDs )

Currently:
The LED corresponding to the hour is constantly on.
The LED corresponding to the minute flashes once per second. ( 1ps )
The LED corresponding to the second flashes 5 times per second. ( 5ps )
Precedence goes to second, followed by minute, then hour.

Examples :
noon and 30 seconds     12 position flashes 1ps and 6 position  
flashes 5ps.
noon and 1 second          12 position flashes 5ps
0115 hrs and 45 seconds     1 position-on , 3 position-1ps , 9  
position 5ps.

Can anyone suggest a better scheme than this brilliant solution ?
CC

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