On 01/09/2010 21:31, Olin Lathrop wrote:
>> The problem is that I can't find any spark proving systems that don't
>> rely on a UV sensor.
> How about a thermocouple in the flame?
>
my old boiler used a simple CdS  LDR cell.

Eventually it got sooty and had to to be wiped occasionally or the=20
system would shut down.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.