Atmel AVR with radio transmission question.

Choose a micro with serial UART function. Send regular serial data thru the RF link. Very simple.

Luhan

Yes, it was confusing. I'd define a serial protocol, then use the UART of both controllers to send it over the RF Link, provided this RF Link has a serial bit input.

Rene

Yes, it's confusing. But I've done what you want to do, it's easy if you will take the trouble to learn some microprocessor programming, if you do not do this you won't succeed, I'm guessing from what I have read you cannot program a micro ? If not there is no point going on with this task, it's a skill you absolutely need to do what you want. But you *can* learn it, I'm sure.

You want to send 10 bit data. Basic miroprocessors can send 8 bit data bytes. You therefore need to send 2 such bytes to transmit each sample. You send the lowest 8 bits in the first byte, and then another byte which contains just the highest 2 bits of your sample. You need a protocol so that your receiver knows which is the low byte and which is the high of each pair. Your receiver software combines the two received bytes back into one, probably using a 16 bit integer variable to store the result.

Is any of this making sense to you? If not ask about what you don't understand, maybe it might help people here to help you.

Steve

Thanks Luhan, Rene and Steve.

Steve: Now I am going to send 3 differnet 4bit via HT-12E at the same time. Seem I need to do some "shift" to assemble those 4 bits to form a vaild BCD.

Any comment about it?

As a reasonably usless programmer (8051 and C,) I would suggest or-ing the MSB of the first byte of the string with 1. So if you get out of sync you just have to test for something >127 to start the receive routine, then mask it out

martin

If you are not all jammed up sending tons of data, just use the lower 4 bits and send three bytes. You can use the top nibble to designate which BCD it is, one, two, or three. That way they cant get out of sync. K.I.S.S. ;)

Luhan