Hi to all, I put together prototype project using keypad with individual diodes added to each key and wrote the code every things working fine now other group took my project and took all diodes off "bypassed" and same project is working fine too I do not see any problem. My question is what's the real reason to use diodes with keypad? thanks Andre -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist