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First of all: you are running Raspbian Stretch but tagged the question with pi-4. This is not possible. A Raspberry Pi 4B can only run Raspbian Buster. Your timer Unit looks good and should do. But you define some default settings that are not necessary. This normally should not do any harm, but having problems it's always a good idea to configure with ...


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Adding a diode seems to prevent back power, while still giving power to the motor driver. EDIT: Here is the schematic:


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The L298N module typically has a terminal marked +5V (shown as logic supply 5V on the attached diagram). As long as you do not connect this terminal to the Pi you will be fine. I am not going to speculate further without a clear photo of the module you are using. The L298N module derives its logic supply power from the attached battery/power supply or the ...


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