Build power on/off support HW for Media Player
|Status:||Closed||Start date:||11 Sep 2014|
|Category:||06 - Hardware|
|Severity:||04 - Low|
The design has been diagramed and there are off the shelf parts for this so now I need to order them, prototype the design and integrate with the custom media player case that is under development.
Here is the design as it stands now.
#1 Updated by Hammel over 3 years ago
- File PiBoxMediaPlayerCase.png added
- Status changed from New to In Progress
- % Done changed from 0 to 10
Updated the diagram to show sizes in mm (easier to work with in Blender) for everything except the SPST switch, which I haven't chosen yet. I also need to create a repo to hold the diagram too.
#4 Updated by Hammel almost 3 years ago
- % Done changed from 10 to 70
The prototype cases were built out of wood boxes I purchased from Michael's (pictures coming). The power on/off support is handled with a SPDT switch that is tied directly to the power input on two different devices for both the Media Server and Media Player.
In the Media Server the UUGear 7-port hub was unable to power the RPi, so I tied the SPDT directly to the power input on both boards (the UUGear is jumpered to be self-powered only). Ground is common to both devices and the input power (a 5V/4A barrel connected wall-wart).
In the Media Player the SPDT power is tied to the power input on the RPi. The power input comes from a micro USB 5V/2A wall wart that is tied directly to the pico projector. In this way, whenever power is plugged into this box it will try to charge the projector, but will only power the RPi when the SPDT is switched on.
In both cases it's important to have enough amps in the wall-wart/power source or the circuit fails to boot the RPi.
It's a really simple circuit in both cases, using off-the-shelf breakout boards from Sparkfun.
Note that the LiPo power in these prototype cases is just an externally connected Jackery Giant battery pack. But a wall-wart works as well.