Im having problem with my ultrasonic rang meter project. any pointer where i could learn more about pic? The project i stated can be found here http://www.interq.or.jp/japan/se-inoue/e_pic6_6.htm using PIC16F873. Unfortunately, when i try to assembly the source code by using the MPASMWIN, it reported the error on this codes. Can anyone help to look how this problem can be solve? The source codes can be view at http://www.interq.or.jp/japan/se-inoue/e_pic6_65.htm