Why is that every post I make seems to be ignored. I throw out a suggestion and it seems like nobody even gives me the time of day that I even exist. IT IS REALLY EASY. MODULATE THE TRANSMITTER. Ok, so you can't use any external componants to make an audio signal but you can still use a large number of encoding methods that you can PWM the ultrasonic device with. PWM at various frequencies an capture the timing at the receiver or send out a series of short and long pulses and capture it like RS-232. You can even pulse it like Morse code for all I care. Wan Zulhelmi Wan Ahmad Kamar wrote: >Yes.. It's part of my final year project. I've got the receiver and >transmitter part almost done. It's just that the PIC18f is going >nowhere at the moment. > >On Wed, 25 Aug 2004 18:58:19 -0700, Shawn Wilton wrote: > > >>Why do you *have to* use the 18f? Is this a school project? >> >>Shawn Wilton >>Junior in CpE >>MicroBiologist >> >>Phone: (503) 881-2707 >>Email: shawn@black9.net >> >>http://black9.net >> >> >> >> >>Wan Zulhelmi Wan Ahmad Kamar wrote: >> >> >>>Sorry, forgot to mention that i can't use an external device that >>>already have the built in function. I have to use the PIC18f to do >>>its functionality. It's practically reinventing the wheel, i know. >>> >>>Thanks. >>>From - Wan >>> >>>On Wed, 25 Aug 2004 21:46:00 EDT, savanapics@aol.com wrote: >>> >>> >>> >>>>There is a transmitter IDing device that the Hams use. I am not sure of where >>>>to get it, but if you are intersted, contact me offline and I will see if I >>>>can get you some information on it >>>> >>>>Eddie Turner, kc4awz >>>> >>>> >>>> >>>>-- >>>>http://www.piclist.com hint: The list server can filter out subtopics >>>>(like ads or off topics) for you. See http://www.piclist.com/#topics >>>> >>>> >>>> >>>-- >>>http://www.piclist.com hint: The list server can filter out subtopics >>>(like ads or off topics) for you. See http://www.piclist.com/#topics >>> >>> >>-- >>http://www.piclist.com hint: The list server can filter out subtopics >>(like ads or off topics) for you. See http://www.piclist.com/#topics >> >> >> > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics