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By the Daewoo protocol a logical 0 bit exists
of a high puls with a duration time of 550 µs followed |
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by a low puls of 450 µs this means that
the total duration time of a logical zero bit is 1ms. |
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A logical 1 bit is formed by a high on time of
550 µs followed by low signal of 1450 µs this means |
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also that the total duration time of a logical
one bit is 2 ms. |
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The carrier frequency of the infrared signal is
38 kHz. When you will decode the signal with an |
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integrated receiver module you need a receiver
module wich is tuned on 38 kHz like the TSOP1838 |
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fabricated by Vishay. It will function also with
a 36 kHz module but the sensitivity is less than by a |
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38 kHz module. |
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Because the receiver (mostly in hobby applications
a microprocessor) needs to trigger on a new |
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received code the protocol starts with a start
bit of 8ms high level pulse and a 4 ms low level pulse. |
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After this the 7 address bits and 7 command bits
are sent. But the two words are divided by a 550µs |
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high level signal and 4ms low level signal. Terminating
the protocol is done with an another |
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high level signal of 550µs. |
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The time between two startbits of bitstreams when
the button on the remote control is being pressed =60 ms. |
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