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| Digital Communication Via VCC and GND |
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| radioactive:
--- Quote from: ogden on September 19, 2018, 08:35:43 am ---Are you absolutely sure there will be no noise on that bus? No switching regulator, no transients no nothing - pristine DC? --- End quote --- Good point. I wasn't too concerned about the 24VDC supply since it is filtered quite good. Updated the sim with 2V @ 280KHz noise on the 24VDC supply (gets filtered out well), added 200mV noise @ 1 MHz (also tested at 200 KHz) to both the 3v3 supply to the comparator and the TX side to simulate some pretty insane ripple from supplies. Still looking good. Should be a pretty good start in any case. |
| tggzzz:
If the wires are long, and particularly if they are outside, don't forget to consider the non-communication aspects of such as system. This is not a complete list, but think of different mains phases, different potential between ground at each end of the wire (especially w.r.t. lightning strikes :) ), EMI and EMC....... |
| ogden:
--- Quote from: radioactive on September 19, 2018, 11:07:32 am ---Should be a pretty good start in any case. --- End quote --- Seems like good start - if simplicity is paramount to stability. FEC can give big improvement. It does not cost much - just coding ;) One of options: http://www.ti.com/lit/an/swra113a/swra113a.pdf If you are interested - TI made their CC-radios FEC source code public. Just search for it. In case you see that unmodulated transmission does not work, try following. Obviously replace IR diodes with proper coupling to your DC bus): https://www.maximintegrated.com/en/app-notes/index.mvp/id/4622 [edit] Many microcontrollers have IR modulators built-in. |
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