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So he designed a simple pass-through device with an ATtiny85 and a couple passives that latches onto the relevant lines in the cable. After some investigation, found that not only was the content of the TOSLINK audio source being sent over this DB9 cable, but so were the control signals required to turn the system on and off.
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You might think this would require some kind of separate stand-alone device, but as it turns out, all the necessary information was available by reverse engineering the connection between the receiver and the subwoofer. Still, he reasoned that he should be able to detect when the TOSLINK audio source is actually active or not, and give the speaker system the appropriate signal to either power on or shut down. Unfortunately, the speakers has only support optical audio so any interoperability with HDMI-CEC hacked or otherwise was immediately out the window.
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All wanted was for his Bose Cinemate speakers to turn themselves on and off as needed.īut in this case, it would take a bit of custom hardware to get similar functionality. The Arduino was quite a bit larger than the original microcontroller, but with some careful wiring, he manged a very professional looking installation.
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After analyzing the communication between the two chips, pulled the S3P70F4 off the board and wired an Arduino Pro Mini in its place. Subwoofer Phase Setting: Which is best? 0? 180? (Subwoofer Setup Tip)ĭocumentation for this particular chip seems hard to come by, but he was able to find a similar chip from the same manufacturer that was close enough to put him on the right track.