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Powering a PI (and accessories) from a 12v 15A rail.

halkun

I'm getting together parts for a project that will put a Pi 3 with touch screen in my car. It's replacing the radio, but the 12v line that went to the radio has a 1A fuse, which is too low for the 2.4A power needed for the PI 3. However, under the radio is the cigarette lighter, which has a 15A fuse. Sadly, most of the 12v lighter to 5v USB adapters have a 1A limit. I'm going to need some kind of breakout that's going to power PI and it's various attachments.

 

Breaking down further -Things I need to power.

 

Raspberry Pi 3  - (5v 2.4A)

Touch Screen - ? (the pi powers it)

Pi Cam (Powered from Pi)

 

7 port USB hub (5v - 2A)

GPS module (Powers from USB hub)

External Webcam (Powers from USB hub)

 

What parts do you think will make something like this? I'll most likely be dong this in some perfboard. My guess is that I'll break out to:

-One USB (+5 and ground only @ 2.4 amps) to the  Pi/touchscreen complex and

-One wall wart "tube" power jack (5v  2A) to the USB hub.

 

Any ideas on a part list?

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  • 0

    Wow. I didn't think I would get so many thoughtful and useful replies! Here I just wandered in because of Ben Hack and this community is great.

     

    Turns out I jumped the gun and have been spending my time on the Maker/Pi side and didn't do much research in the Vehicle side. Turns out my problem has been already solved by many manufacturers. First I apologize, and I read my wiring diagram wrong it's 12v 15A going to the radio. (The 1A line went to my A/C control deck, under it.. Helps if I follow the lines right image) My model also has a sense line that stays high after I turn off my car and will drop to low after I open my door or after 10min has passed. (So the radio stays on after the car is turned off to you can listen to the end of you favorite song)

     

    However, there are aftermarket modules for cars that take the 12v line and steps it down two 5v 3A USB ports. It also has a considerable filter on it to clean up of voltage. It appears the 12v DC coming off the alternator is *super* dirty and really all over the place.

     

    The Bluetooth is needed so I can link into my car's CAN network so I can pull ECU and telemetry data from my vehicle

     

    Wifi is needed as I'll be running a VNC client so that I can redirect my cell phone's display to my car's screen for GPS and access to my apps...maybe Still researching that one.

     

    The only other issue I have is a safe startup/shutdown watchdog system... I'll Look into that later too.

     

    Anyways thanks for the input.. I'll probably be doing a youtube series on this.

Reply
  • 0

    Wow. I didn't think I would get so many thoughtful and useful replies! Here I just wandered in because of Ben Hack and this community is great.

     

    Turns out I jumped the gun and have been spending my time on the Maker/Pi side and didn't do much research in the Vehicle side. Turns out my problem has been already solved by many manufacturers. First I apologize, and I read my wiring diagram wrong it's 12v 15A going to the radio. (The 1A line went to my A/C control deck, under it.. Helps if I follow the lines right image) My model also has a sense line that stays high after I turn off my car and will drop to low after I open my door or after 10min has passed. (So the radio stays on after the car is turned off to you can listen to the end of you favorite song)

     

    However, there are aftermarket modules for cars that take the 12v line and steps it down two 5v 3A USB ports. It also has a considerable filter on it to clean up of voltage. It appears the 12v DC coming off the alternator is *super* dirty and really all over the place.

     

    The Bluetooth is needed so I can link into my car's CAN network so I can pull ECU and telemetry data from my vehicle

     

    Wifi is needed as I'll be running a VNC client so that I can redirect my cell phone's display to my car's screen for GPS and access to my apps...maybe Still researching that one.

     

    The only other issue I have is a safe startup/shutdown watchdog system... I'll Look into that later too.

     

    Anyways thanks for the input.. I'll probably be doing a youtube series on this.

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