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The simplest way is probably to use 220V Latching Relay. At each pulse, those change states and remain in position even if there is no power. For MCU based, It's difficult to have a small implementation because you will need at least a power supply. Arduino does have some very small boards though. The idea is to when the system is switched on, the capacitor ...


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Use a motor-generator. In other words, a simple and safe solution might be to put an old classic dynamo and the matching light on E-bike. This would allow unmodified usage of typical components, does not require to connect anything to E-bike electronics, unlikely to cause problems for controller and may even reduce the battery consumption as both you and say ...


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There are too many unknowns to provide a definitive answer. You are going to have to try an empirical approach and see what works. I would only introduce a single change at any one time and see if it works over a couple of days before introducing the next modification. As you suggest connecting the light(s) in parallel with the battery is the best approach. ...


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