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RC-1 has very-very-very simple codeset. There are 2 buttons/codes only - "Shutter immediately" and "Shutter after 2 seconds delay". The first one (SHUTTER) consist of 480 uSec pulse followed by 7.3 mSec delay followed by one more 480 uSec pulse.
___ ___
| | | |
___| |____________________| |_____
0.48 ms 7.3 ms 0.48 ms
The second one (DELAY2SEC) is similar but the delay between pulses is 5.4 mSec.
___ ___
| | | |
___| |______________| |_____
0.48 ms 5.4 ms 0.48 ms
Note, this is modulating signal. The carrier frequency should be about 33 kHz. So, if you will produce the carrier by software you need to code every pulse as the follow signal:
__ __ __ __ __
| 1| | 2| | 3| |15| |16|
___| |__| |__| |_ ..._| |__| |__ ... 7.3 ms or 5.4 ms delay ...
15u 15u ... 15u 15u
<---------- 480 uSec ---------->