here is a link for an Ultrasonic Distance meter using PIC16F873
The only known drawback is that it can only measure a maximum of 3 mtrs
Can be upgraded by changing firmware
http://hobby_elec.piclist.com/e_pic6_6.htm
The only known drawback is that it can only measure a maximum of 3 mtrs
Can be upgraded by changing firmware
http://hobby_elec.piclist.com/e_pic6_6.htm