Sunday, January 9, 2011

RF Module Interfacing

RF modules are widely used for wireless data transfers and remote control applications. These days, cost of RF modules are very low and are compact in size. Most of these RF modules are operating around 433MHz. Amplitude Shift Keying (ASK) or Frequency Shift Keying (FSK) are mainly used for wireless data transfers.

These are quite easy to interface. FS1000A/PCR2A, TX/RX Module from Vega Kits is used for demonstration. Both the receiver and transmitter are three terminal devices with pin outs as shown below.

By this time you might have got the idea of interfacing. Supply voltage range is 3-12V.  It has only single channel. ASK is used for transmission. The serial data given at the input TXD of the transmitter will be received at the RXD of the receiver.The maximum data rate supported is 4KBps. RXD and TXD are TTL compatible. Open range is about 80m.  HT series of encoder/decoder pair IC's are usually used with this module for parallel to serial and the reverse conversion of data.

Click here for a sample interfacing circuit.

12 comments:

interesting un known facts said...

hi this is latheesh. can you please give me the interfacing circuit with holtek 12e and 12d

Anil said...

Ya definetly.
I will be posting it soon

Anonymous said...

information was useless. this information is already available in the data sheet which comes with the module. do attach the interfacing here pls..............

Anil C S said...

I have posted a circuit example for RF module interfacing as per you request. Follow the link below

http://technoburst.blogspot.com/2011/07/rf-module-interfacing-circuit-example.html

Anonymous said...

good info thank u

Anonymous said...

How i can use thes pair to send data between two micros without encoding.
Just strings of bytes, using the USART on the pic connected to transmitter or receiver ?

Anonymous said...

If you have a solutions to connect my two pics via usart and these TX/RX modules, please write me at igeorge@rogers.com.
I posted the post above
Thank you

Anonymous said...

where can i get the transmitter and receiver modules?? pls help

Anil C S said...

First thing is to goto to an electronic shop and ask for a 433MHz RF module. It costs around Rs 350- Rs 450, in India.

If the above option fails you can get these things online from robokit india

Anonymous said...

can you please specify the resistor and capacitor values

Anonymous said...

i tried to use this product to make a simple wireless switch but it did not work my circuit diagram is in this link http://ankitverma658.my3gb.com/tr_module.JPG please help me

Anonymous said...

Thank You. Gratitude.

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