> > When voltage level changes by more than 10% >=20 > The Red Rock site, going for some years now, has some very simple LED > quadrature sensors for finding the sun. I made one using 4 x 3mm clear > greens and it works very well with a PIC A/D >=20 > http://www.redrok.com/ Looks like what Russell would describe as a 'black hole' site ... Gotta laugh at the link down the page to another tracker design from someon= e else 'that uses a microprocessor not approved by the FCC, so causes radio= interference ... ' or similar wording. --=20 Scanned by iCritical. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .