Wireless Serial Communication

[premkumar9]

Hi,
For one of my projects I have done serial communication between 89C52 and 89C2051 microcontrollers through the RXD, TXD pins. Can anybody pls suggest a method to make this communication wireless with minimum modifications.

 

[Gayan Soyza]

If the two micros in the vicinity then I would simply use an IR protocol & transfer the data.

If I need more distance then I use license free wireless RF modules to transfer the data.

 

[premkumar9]

If the two micros in the vicinity then I would simply use an IR protocol & transfer the data.

If I need more distance then I use license free wireless RF modules to transfer the data.

Can you be little more specific please? Is there any standard RF module readily available suitable for this purpose? Any idea?

 

[Gayan Soyza]

See the attached file.

 

[premkumar9]

Thank you.

 

[Ubergeek63]

https://www.electro-tech-online.com/custompdfs/2008/11/micrf610.pdf

 

[premkumar9]

Thank you very much.

 

[DSGarcia]

Try Wireless Networking Solutions from Roving Networks, Inc. and http://rovingnetworks.com/documents/blueportxp.pdf
for wireless RS-232 cable replacers based on Bluetooth.
Dale

 

[Ubergeek63]

Thank you very much.

You're welcome....I would have suggested a chip but very few are convenient for hand assembly any more.

 

[premkumar9]

See the attached file.

I used ST-TX01-ASK as transmitter and ST-RX04-ASK as receiver. Get data at the DATA pin of the receiver(checked with oscilloscope). But level becomes too low when connected to the RXD pin of uC. Then tried with a load resistor. Even with 100KΩ load the level comes down from 5V to <2V.
Is this normal behavior OR something wrong with the device?
Do we need a buffer for connecting to the RXD pin?

 

[premkumar9]

Yes.It was a problem with that particular piece.

 

[premkumar9]

Can anybody please suggest a method to get 2KM range? My equipments are fixed. So directional antenna is enough .