Hi,
I searched and read some on this, sorry if I don’t understand yet…
I’m working on a clock project involving gps transmission over rf. All of the programming was done by someone else, and it works fine on his end. He is located in Scotland, so local help is a little difficult. His support on this project has been excellent, but I fear we may have problems on this one. I’m trying to duplicate his results, but got stuck on the rf section.
The tx pic is a 16F627A, which reads the NMEA signal, culls out all info except time and number of sats received, then transmits this data via rf to the rx pic, a 16F77. This happens at a 1Hz rate. This pic in turn decodes the stream, outputs time HH:MM:SS in BCD and received sats, also in BCD. The 16F77 also has a bit of code to flash a led to indicate data received.
The system works great hard wired together, but when I try to incorporate the TLP434A tx/rx pair nothing happens. The programming for both pics was wrote with a wireless link in mind. I’m also using the whip antennas for this project.
Something I noticed today, when I have just the rf rx module powered, the data pin is high. I have no other rf source in the house, is this just noise?
From what I’ve read here, I’m thinking I need to use some Holtek enc/dec chips to get the data through. Am I on the right track? I was planning on several clocks receiving the data, so any help is greatly appreciated.
Comments and solutions welcome.
Thanks
John