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Unread 09-08-2013, 05:46
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Re: Battery powered raspberry pi

Quote:
Originally Posted by team1165wins View Post
One of the big problems of powering the pi from the robot battery is that the pi needs to be shut down properly. You cannot just cut the power. What I am thinking is that have the Pi connected to the battery directly (through a regulator), and have the Pi watching using it's IO, the status of the battery through the switch. When the power goes down, the pi needs to shut itself down. I forgot to add, you would need to add a reset switch to the power supply of the pi to allow you to turn it back on. NOTE: I DO NOT KNOW WHETHER THIS IS FRC COMPETITON LEGAL, so if someone knows, if they verify, it will be great. We were going to place a pi. For basic I/O, the propeller quickstart beats the pi in many ways. If being used for vision processing, why not just keep the pi with the driver station and use the network connection to function. You can bridge the connection of the laptop ethernet with the pi to get wifi.
Depending on how you configure the Pi you could cut the power.
Otherwise send the shutdown from the driver's station at match end.

You can add switches to custom circuits not to locomotion circuits or FIRST control system power inputs. Required FIRST switches like the master breaker are the exception.

Feel free to confirm this with FIRST but I have seen it done and pass inspection.

Personally if I am gonna go through the headaches revolving around all this the last thing I would want is to add the headaches of the Raspberry Pi using the field Wifi with any camera. At that point just use the driver's station laptop.

I am generally against sending critical video through the field. It has been a headache for too many people. It even previously could impact field operations. People do this every year and every year someone struggles with it. If you can process the video on the robot you should.

Feel free to disagee with my take on this but that is the benefit of what I have seen.
It is my opinion as an engineer and I am entitled to it.

Last edited by techhelpbb : 09-08-2013 at 05:48.