Just a note to let those people interested in software for PID, that that there is an article: "How to Write a PID Algorithm" (in "C" ) by Garth Gaddy. You can find it in the magazine Embedded Systems Programming, p. 62, May 1997 and the code asociated with it can be downloaded from: ftp://ftp.mfi.com/pub/espmag/1997/gaddy.txt (1KB) In return, can anybody supply me with the article, by fax or mail. Thanks, Peter. -- Peter Homann email: peterh@adacel.com.au Work : +61 3 9596-2991 Adacel Pty Ltd Fax : +61 3 9596-2960 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 014 025-925 http://www.adacel.com.au Australian Software Engineering Excellence