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What is it? There are some things that we need to solve if we want to use a Raspberry Pi in a car, boat, or something similar. First is a power supply. In a car, we have 12V and we need 5V. Second ...Read More…
There are some things that we need to solve if we want to use a Raspberry Pi in a car, boat, or something similar.
First is a power supply. In a car, we have 12V and we need 5V. Second is to power ON and properly power OFF (to avoid corruption problems with the SD card).
There are some solutions on the internet but I didn't find anything which included all my requirements.
The module is attached to the bottom side of Raspberry Pi, so the top side is free for another purpose.
INSTALLING PYTHON SCRIPT FOR SHUTDOWN:
For use this module you need to create a Python script and allow it to run at boot time. Script and procedure are described in the documentation file.
You can use standoff spacer for mounting this module on the Raspberry Pi.
After ACC/IGNITION is ON, the micro-controller is waiting for “power ON delay time”.
If the time does not elapse, the output power is not activated so the Raspberry Pi will not start.
If the time does elapse, the micro-controller activated DC/DC power supply and Raspberry Pi will start to boot. After boot process has started ACC/IGNITION is temporarily disabled because of proper boot procedure (30 seconds).
If ACC is back to OFF position before elapsed “power ON delay time”, the whole process starts at the beginning after ACC/IGNITION is ON again. This allows short temporary ACC/IGNITION ON without starting the Raspberry Pi (if you forget close your windows or something that requires ACC/IGNITION ON, Raspberry Pi will not start before “power ON delay time” elapses).
After ACC/IGNITION is OFF, the micro-controller is waiting for “shutdown delay time”.
If the time does not elapse output power is still activated so the Raspberry Pi continues running.
If the time elapses, the micro-controller sends a command to activate the script in the Raspberry Pi to properly shutdown and turn OFF DC/DC power supply (30 seconds after the shutdown is started).
If ACC/IGNITION is back to ON position just after the shutdown script starts or in time before DC/DC is powered OFF (30 seconds), Raspberry Pi will restart and boot immediately without delay. This is the fast boot method.
Price is for Raspberry Pi Automatic ON/OFF module only. USB cable, Raspberry Pi, acrylic case and other things on the pictures are not included.
If you want some other time settings, leave me a message.
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