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You are here: Home / Topics / Generating the 38khz signal for TSOP ir sensor

Generating the 38khz signal for TSOP ir sensor

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Microcontroller › 8051 › Generating the 38khz signal for TSOP ir sensor

  • This topic has 0 replies, 1 voice, and was last updated 13 years, 2 months ago by Harshal Suryawanshi.
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  • March 8, 2012 at 8:08 am #1591
    Harshal Suryawanshi
    Participant

    hey guys i am working on a project which needs to sense the ir rays…now i have used a tsop sensor for that purpose but after going through the datasheet i am a bit confused about the 38khz signal it senses. please tell me how to generate this signal.

    also it says in the datasheet:

    “The data signal should fullfill the following condition:
    • Carrier frequency should be close to center
    frequency of the bandpass (e.g. 38kHz).
    • Burst length should be 10 cycles/burst or longer.
    • After each burst which is between 10 cycles and 70
    cycles a gap time of at least 14 cycles is neccessary.
    • For each burst which is longer than 1.8ms a
    corresponding gap time is necessary at some time in
    the data stream. This gap time should have at least
    same length as the burst.
    • Up to 1400 short bursts per second can be received
    continuously.”.

    kindly explain me what this means exactly and suggest a circuit to generate this data signal.

     

    thank you.

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