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IR (SIR) UART 8051

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say2paul

Sat Jul 05 2008, 11:32AM

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Well, finally I can now send and receive data between Hyper Terminal and 8051 using RS232. Also I can now display the data (string) I receive from Hyper Terminal to the LCD attached to the 8051.

I want to send the same data (string) from the Mobile phone to the 8051 using IR (SIR). I implemented IrSIR in Symbian Mobile phone and somehow managed to send and receive data between two mobile phones.

Please guide me on how to send the IrSIR data from mobile phone to the 8051?

Can I directly connect TSOP 1738 to the 8051 RX pin to receive data? Or can anyone please help me on the circuit for the same.

Colin Mac

Sat Jul 05 2008, 12:17PM

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This is an IR modulated UART example for a PIC but iit might give you an idea.
http://www.digital-diy.net/18F%20Examples/IR%20Modulated%20UART.aspx

[ Edited Sat Jul 05 2008, 12:22PM ]

say2paul

Sun Jul 06 2008, 08:16AM

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Thanks a lot Colin, but sorry I do not have knowledge about PICs.

Can you or someone else help me on 8051 (AT89C51) with TSOP 1738, so that I can replace the RS232 cable of my PC with TSOP 1738 and send data from mobile instead of Hyper Terminal.

Ajay

Mon Jul 07 2008, 08:34AM

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Paul as i said.. you need a carrier of 38khz + data thats all..

in that PIC project, he used single pin for sending data + generating PWM signal of 38Khz (carrier).

so you can do with little hardware as i told...

here are the steps..

1. generate 38khz square wave on any 8051 pin.
2. and the tx pin + square wave o/p pin to get the modulated data.

transmitter is ready

for receiver:
connect TSOP1738 to rx pin of controller.
receiver is ready

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say2paul

Mon Jul 07 2008, 08:42AM

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Thanks Ajay, right now I just need receiver. I have a doubt and that is do I need to connect tx pin to a PC or something else OR can I leave tx pin free when I am receiving data from TSOP using rx pin of uController.

say2paul

Mon Jul 07 2008, 08:53AM

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Joined: Tue Jun 17 2008, 10:56AM

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I thought you are online and can help me on this now so that I can try and implement it tonight...

Ajay

Mon Jul 07 2008, 09:04AM

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you can make use of tx pin with PC as you are not using it for IR purpose.

you read the data from IR save it and send it to PC via ur TX pin. so you can debug side by side..

I am leaving now