RF module

[luq1988]

Hello,
i wan ask, i hav one project that want to used RF module.
i hav one device and a server. i need to transmit a binary number to the server. Then i need the server to send back i decimal number to the device. so, the question, it is compatible to used the rf module. and how?
my idea ir to connect;
1)RF Transmitter 315MHz
2)RF Receiver 433MHz
with PIC18f452
and
1)RF Transmitter 433MHz
2)RF Receiver 315MHz
with usb connection

but how to connect it

[shiyan]

1)RF Transmitter 315MHz
2)RF Receiver 433MHz
with PIC18f452
and
1)RF Transmitter 433MHz
2)RF Receiver 315MHz
with usb connection

1. You will need 2 UART if you want to send/receive data in serial, right? Will require to develop software UART since PIC18F452 have 1 hardware UART.
2. Try refer to Cytron DIY project, I think they have a set that show 2 board using the RF module to send/receive data.
3. Forgot which volume of ROBOT. Head to Toe. Did talk about this RF module too, need to check with them.

[luq1988]

so it is impossible to connect
1)RF Transmitter 315MHz
2)RF Receiver 433MHz
with PIC18f452???
but refer to the to Cytron DIY project, it is possible..

how about this case?
1)RF Transmitter 433MHz
2)RF Receiver 315MHz
with usb connecter.

any one can help??

[hyng]

so it is impossible to connect
1)RF Transmitter 315MHz
2)RF Receiver 433MHz
with PIC18f452???
but refer to the to Cytron DIY project, it is possible..

how about this case?
1)RF Transmitter 433MHz
2)RF Receiver 315MHz
with usb connecter.

any one can help??

shiyan never say it is impossible. Please do refer to the DIY project. The concept is basically the same, just that you need another pair of UART. PIC18F do have the libraries for software UART. You may refer to the SD02B sample code. At the USB connection, it is quite challenging. My advise is use UC00A - USB to UART Converter which mean you need another microcontroller at the server part before go to the PC.

Device
PIC18F
1)RF Transmitter 315MHz using hardware UART
2)RF Receiver 433MHz using software UART

Server
PIC18F
1)RF Receiver 315MHz using hardware UART
2)RF Transmitter 433MHz using software UART
3)UC00A to connect to the PC using another software UART

[luq1988]

Thank you, it is more clear to me..i will try this..

[luq1988]

but what the different between hardware UART and software UART?

[ober]

I think shiyan has mistakenly thought you need send and receive on the computer site using another 18F452, therefore will need 2 UARTs.

In your case 1 UART is good enough.

18F452
RX pin - RF Receiver 433MHz
TX pin - RF transmitter 315MHz

USB to UART (is not possible to connect to USB pin directly, there must be a converter)
UART's TX pin - RF Transmitter 433MHz
UART's RX pin - RF Receiver 315MHz

ROBOT. Head to Toe magazine did write an article about this, though is one way communication, but it can help you. It should be volume 4 or 5.

[luq1988]

thank you ober.
so i just need 1 pic18f, right?

about sotfware, what kind of software i need to used so that my server can read the data?

[sshw]

can 1 RF module consist different frequency?
how far the distance can it detect?

[yonghui]

hi,

why u need so many frequencies?
one frequency is enough rit?

regards,
yh