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Raspberry Pi power controller adds shutdown and startup functionality

January 18th, 2013, 00:17 Posted By: wraggster

This breadboarded circuit uses a PIC chip to control the Raspberry Pi’s power supply. We first noticed this gap in the RPi features when we built an XBMC setup around the RPi board. It’s not the end of the world, but since installing the Raspberry Pi we have been unplugging it after each use. [Kevin Sangeelee's] circuit could be the path to automating this process.
This is not really aimed at media applications. The PIC circuit does switch power to the RPi, but the goal was to add a push-button to do so. Other goals of the project include scheduled shutdown and data logging of brownout events on the power rail. As you can see, there’s a coin cell in the mix which keeps time when the system is in power down. The RPi communicates with the PIC via i2c. This facilitates full power-down using the Linux command ‘shudown -h’, as well as the ability to schedule a restart time.
Adding an IR receiver and tweaking the PIC code are all it would take to trigger the power controller from the couch.
http://hackaday.com/2013/01/17/raspb...functionality/

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