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There's a crude solution to this problem: Purchase a 12V relay and a cigarette lighter plug. Disconnect the Pi's VCC 5V and connect it to the relay's control. When the...

Hi, I'm glad to answer your questions. I'm using a Pi 4 for testing. The version is 0.41 (Pi 4, Pi Zero 2W). The car stereo is Pioneer 5050BT, which...