Report Double Key Presses in Firmware Bugs Posted December 29, 2011 @mjkuwp94 As mentioned by everyone, your concerns are extremely valid. I'm using if not the same, but an extremely similar IR receiver you mentioned on sparkfun. You actually won't be able to tell the modulation frequency with that specific part. The output of this part is a noise free, demodulated signal from the received IR signal. If you point your remote at this part, and shoot, you will be able to receive the output on your scope because 56kHz is still within the wide frequency band of the on part filter. However, when passing through the AGC, it could have unpredicted results on the output which will show up as jitter, or worse. You can try this experiment by looking at the output and comparing your scope shot next to the IR receiver, and again when emitting a signal from the other side of the room, where the frequency effects would be more exaggerated. My algorithm will be fine tuned in the future for this, and eliminate the need for double recording (is that your primary concern?). But overall, I have to play a lot of tricks in order for this RC6 protocol to work which is outside the specified 38kHz center frequency of my receiver. All this being said, there are some RC6 protocols which are 38kHz, in which the only problem would be the double presses issue, in which you would need to record your button twice. If this truly what you are seeing, how is the performance of your flirc when you have done so? I've often found RC6, regardless, doesn't seem as solid. Thanks so much mjkuwp94.