Dwayne Reid wrote: > The spark is continuous Is that the reason the UV sensor can't see the spark when there is a lot of ambient UV? Can you use AC to create the spark, then sense the presence of the right frequency from the UV sensor. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .