Post 3 made on Monday December 19, 2016 at 14:31 |
3FG Select Member |
Joined: Posts: | August 2009 1,861 |
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UEI is the developer of this XMP IR protocol and they send: ON bursts are 208 microseconds (8 complete modulations of 26.0us -- about 38.46KHz. Probably the box is looking for 8 rising edges rather than a specific on time.) OFF bursts are 758us * N * 138us where N varies from 0 to 15. In general, you're sending off periods that are slightly too short, about 30uS. The tolerance here is pretty narrow--by spec each off burst must have the correct duration with +/-69us. When you consider timing variations in the sending hardware, it't not too difficult to be right on the edge. Try making the off durations closer to the theoretical.
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