Wireless Serial Communication

premkumar9

Member

• Nov 13, 2008

• #1

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

Active Member

• Nov 14, 2008

• #2

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.

 

Last edited: Nov 14, 2008

premkumar9

Member

• Nov 14, 2008

• #3

Gayan Soyza said:

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.

Click to expand...

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

 

Gayan Soyza

Active Member

• Nov 14, 2008

• #4

See the attached file.

 

Attachments

• TLPRLP434A.pdf

  34 KB · Views: 325

premkumar9

Member

• Nov 14, 2008

• #5

Thank you.

 

U

Ubergeek63

Well-Known Member

• Nov 14, 2008

• #6

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

 

premkumar9

Member

• Nov 14, 2008

• #7

Thank you very much.

 

D

DSGarcia

New Member

• Nov 14, 2008

• #8

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

 

Last edited: Nov 14, 2008

U

Ubergeek63

Well-Known Member

• Nov 15, 2008

• #9

premkumar9 said:

Thank you very much.

Click to expand...

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

 

premkumar9

Member

• Oct 27, 2009

• #10

Gayan Soyza said:

See the attached file.

Click to expand...

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

Member

• Oct 27, 2009

• #11

Yes.It was a problem with that particular piece.

 

premkumar9

Member

• Oct 28, 2009

• #12

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