By designing one as a master and connecting it with two wires (signal + ground) to the other ones. When the master decides to change frame it send a high signal to the other two which will then switch frame next time they encounter the magnet.
Does the processor have a spare digital pin that can be configured to in or out? I'll be happy to tinker with the firmware myself if I can get some hints regarding the electronics.
/Tommy
How hard would it be to sync three SpokePOVs?
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Please be positive and constructive with your questions and comments.