Andre, long time no hear you would be interested in this 16F88 tachometer project http://www.siliconchip.com.au/cms/A_107675/article.html Part 1 images http://dl.dropbox.com/u/18683201/SC_1006_tacho_01_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_02_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_03_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_04_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_05_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_06_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_07_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_08_sm.gif http://dl.dropbox.com/u/18683201/SC_1006_tacho_09_sm.gif The software and PCB layout files can be downloaded from http://www.siliconchip.com.au/cms/attachments/show.html?year=3D2006&month= =3DOctober Unfortunately I can't lay my hands on the Part 2 issue right now (test and set-up) but there are enough comments in Part 1 and the ..asm file to help you to understand how it does what it does - despite how some of the s/w is written ;-)) Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .