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[SOLVED] Interface a 315 MHz ASK RF Module with Pic18.

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Praveen Kumar P S

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Hello Guys...

I wanted to interface a 315Mhz Ask RF Module(Rx and Tx) with Pic18F4550.But i dont know how to do that...plzz somebody help me...I assume that some external oscillator is need other than internal oscillator...
All i want to do is send a string and receive it.Also i want to do the send and receive with a same single pic18f4550.

Plz somebody help me with a good diagram ....and suggestions for writing the program....

Thank You..........
 

horace1 said:
The Pic18F4550 has one UART and one USART so you should be able to connect one to you PC and the other to the RF module
Click to expand...

Could you plz help me with a good diagram.I dont know how to use the pins of Trasmitter and reciver.....Tx has 8 pins and Rx has only 4 pins.....

Thank You......
 

the simplest thing is to do a web search for pic18f4550 projects and you will get dozens of links with sample schematics and code

- - - Updated - - -

although the PIC18F4550 web page
https://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010300

mentions 1 UART and 1USART the device datasheet
https://ww1.microchip.com/downloads/en/DeviceDoc/39632e.pdf
describes one USART which will cause problems if you need to two UART/USART serial interfaces

have you more details of the 315Mhz Ask RF Module
 
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You can connect the RF transmitter module to Tx pin of UART and then write UART transmit code. The baudrate should be kept low like 1200 bps. RF module will not handle baudrate greater than 4800 bps. You can connect Rx of PIC to data line of Receiver RF module.
 
Hi,

You can use the chips internal oscillator, no need for an external crystal.

Search this forum and you will find many entries for these 315 or 433 mhz Ask RF modules.

You will also see that to operate correctly you need to use an encoding method , namely Manchester Encoding in your program code otherwise as the receiver picks up all manner of signals you cannot detect which is your actual transmission.

The connections should be quiet straight forwards, but if still confused post a picture of the actual modules you have.
 
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