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Help need to implement IR communication b/w two microcntroller 89s52
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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph
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yasir mahmood abbasi
Tue Jan 29 2008, 12:08AM
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i need circuit and configuration code to implement IR sensor led communication b/w microcontroller
and tell me frequency
baud rate,
how to interface it.


yasir
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Ajay
Tue Jan 29 2008, 09:07AM
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IR sender: IR LED
IR Receiver: TSOP1738
IR Frequency: 38Khz
Baudrate: 1200bps (for good communication)

Please make use of NE555 in astable multivibrator configuration for 38Khz square wave and 50% duty cycle. Connect the o/p of 8051's UART to RST pin of NE55.
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hyogesh
Tue Feb 12 2008, 12:56PM
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On the sender side I connected the IR LED & transmitted the data on 1200bbs & on the Receiver side I collected the data using the IR detector at 1200bps, but communication is not establishing between to 8051 controllers???

The ckt explained above (IR Sender has how much baud rate & how u have connected the TSOP at the receiver side?) Can u give me the ckt diagram for the same & some help on it....

Thanks
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Ajay
Tue Feb 12 2008, 10:39PM
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TSOP understands only PCM waveform so you need a 38Khz carrier wave for transmitting your data.

TSOP is directly connected to 8051's RX pin but after you receive the data you need to complement it.
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say2paul
Sun Jul 06 2008, 11:08AM
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Ajay wrote ...

TSOP understands only PCM waveform so you need a 38Khz carrier wave for transmitting your data.

TSOP is directly connected to 8051's RX pin but after you receive the data you need to complement it.


You mean to receive data from an IR transmitter (mobile phone/remote), TSOP's data pin can be directly connected to the RX pin of the 8051 micro Controller??

If yes, can I use the same code to scan the data that I am using while serial connection of 8051 with Hyper Terminal?
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Ajay
Mon Jul 07 2008, 07:18AM
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well serial port can be only 1-1 connection. you cant use the same port for receiving and sending with two peripherals.

rather.. if you use only rx pin of controller for IR reception then tx can be connected to PC like simplex communication.
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say2paul
Mon Jul 07 2008, 08:14AM
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you mean I have to connect the tx pin to a pc? Can't I leave the tx pin free?

Or if i has to connect in anycase, can I connect it directly to an IR led?
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sashijoseph
Mon Jul 07 2008, 08:09PM

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You can very well leave the tx pin unconnected...
Let there be music........
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sashijoseph
Mon Jul 07 2008, 08:14PM

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Ajay wrote ...

TSOP understands only PCM waveform so you need a 38Khz carrier wave for transmitting your data.

TSOP is directly connected to 8051's RX pin but after you receive the data you need to complement it.

think you would have to invert the bits before it gets to the rx pin,else with the start and stop bits of the frame inverted,the controller will not be able to make out the serial frame.
Let there be music........
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say2paul
Mon Jul 07 2008, 10:33PM
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sashijoseph wrote ...

think you would have to invert the bits before it gets to the rx pin,else with the start and stop bits of the frame inverted,the controller will not be able to make out the serial frame.


Dear Sashi, Can you please explain it in detail. I do not have any idea how to invert the bits..?
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