> As Tony Nixon has said, the weak pull-ups are too big, you > only need a few k ohms (typically1k - 4k7 depending on the > buss capacitance and speed) Yes, but if he's doing this between two PICs only (which I thought the problem was), then it should work. PICs have CMOS inputs, and require virtually no pullup current to exceed the minimum IIC 1 level. The only issue is speed. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body