friends , my projects is to display bus name through lcd display in bus stop when it coming at a certain distance approximately 80m using rf transmitter(in bus ) and receiver(in bus stop ) . I'm facing two problems .
1. when two bus came simultaneously. receiver couldn't receive data . i want to transmit two signals .
2. program idea or steps to do for above project. I'm using pic16f877
Why can't receiver receive two signals? Are you proposing to transmit continuously?
The simple approach is to transmit a short signal from the transmitters with a random gap between each transmission. That way it's less likely that signals from multiple transmitters will collide, and if they do, it's even more unlikely that they'll collide a second time.
ya I'm using pic16f877 for my project. it used to display bus name by searching in look up table . but not with rf. can you suggest some model circuit or how to do ?
The transmitter should use something to encode the signal also. You can use a microcontroller to do that. The delay can be put into the transmitter's microcontroller code while you're at it.