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The Pi has 3 "components" the CPU, GPIO and Video Core which are relatively independent. Even when the Pi is shutdown the Video Core continues to run, and the GPIO pins retain their state; only the CPU is not running. (All Pi models before the Pi4 have identical GPIO and Video Core; only the CPU changed on the Pi2 and the Pi3. The Pi4 is all new.) ...


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It's warm because it's still consuming power. In reading your question, I initially assumed you were confused, or that shutdown from the GUI interface was somehow different from shutdown command entered at the terminal. My skepticism was based on something I read in the Raspberry Pi forum posted about a year ago (June 2019). In this post, a "Raspberry ...


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All sorts of circuitry will be powered while power is applied even after you shut down the operating system. You would have to study the schematics for your Pi model to check which components are still powered. I think early Pi's still used about 100 mA at 5V when shutdown.


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Your Unit file does not have an [Install] section. This makes your service a static Unit. Static Units are not started by itself and cannot be started/stopped with systemctl. They are started/stopped only by dependencies on other Units and will never start if there is no dependency on another Unit. So your program will start/stop only in direct conjunction ...


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