Atmel AVR with radio transmission question.

[sommes]

In this project, 10bits digital signal from AT90S8535 ADC is desired to
transmit by radio transmission to other AT90S8535 microcontroller (HT-12E
encoder with TLP-434 transmitter are chosen by partner) and received by
HT-12D decoder with RLP-434.

1) I would like to ask how can I send digital signal by HT-12E? I've read
the datasheet of HT-12E, It is a 12bit encoder there is a 8bits address bit
and 4bits data bit to transmit signal, but I'm not really understand how
does do it work.

2) Which way would be suitable to transmit by HT-12E?

a) Output ADC signal by low four bit and input this low four bit to HT-12E
data bit D0-D4.

b) Converting ADC 0 - 1023 and scaled from 0-999, take each digit away and
transmit each digit by 1 data bit of HT-12E, so each data bit can send
individual signal.

3) Do you guys think HT-12E with TLP- 434 are suitable to transmit digital
signal from microcontroller to other microcontroller. It is because it is
normally in use by remote control system.

4) Could you please suggest me to radio transmit digital data from one
microcontroller to other microcontroller?

Thank you very much

Please let me know if you get confused on reading my letter.

 

[Luhan]

4) Could you please suggest me to radio transmit digital data from one
microcontroller to other microcontroller?

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

Luhan

 

[Rene Tschaggelar]

In this project, 10bits digital signal from AT90S8535 ADC is desired to
transmit by radio transmission to other AT90S8535 microcontroller (HT-12E
encoder with TLP-434 transmitter are chosen by partner) and received by
HT-12D decoder with RLP-434.

4) Could you please suggest me to radio transmit digital data from one
microcontroller to other microcontroller?

Thank you very much

Please let me know if you get confused on reading my letter.

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

 

[Steve]

Please let me know if you get confused on reading my letter.

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

 

[sommes]

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?

 

[martin griffith]

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

 

[Luhan]

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?

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