--Boundary_(ID_UBD297y/qWdtw81rRqIpTw) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Olin wrote... >> >He is using the ac as timebase. >> >> Duh. Guess I could have figured that out for myself... :) > >I think your idea still makes sense, Dave. You have to have the rectifiers >and cap someplace. It might as well not be on the rotating board. Good point. >I don't >think it would be hard to superimpose a serial bit stream on the power >connection. This could be fed straight into the UART after detection, using >the slowest possible baud rate. Timing information can be transmitted as >data, and only needs to be communicated every second. Yeah, I was wondering whether superimposing data and DC power would really be all that difficult. Noodling on it a bit, I came up with the attached. The diode string D2 through D4 sets the amplitude of the transmitted data stream. D5 and C2 "hold up" the DC supply on the propeller side during data transmission. D6 provides MARK level restoration for the receiver, so long data streams don't get garbled by the AC coupling of C3. C4 provides some level of noise filtering, and should be as large as possible short of interfering with data reception. R4 provides a bit of DC hysteresis in the receiver to help further reject noise. The values shown should provide good operation from 1200 baud to about 4800 baud; if lower data rates are used, C3 and C4 should be increased proportionally. The filter cap values might need some tweaking, so supply ripple and load transients don't interfere with the data. 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