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-   -   Chromecast hacking: SD card slot for power (http://forums.macnn.com/57/consumer-hardware-and-components/502761/chromecast-hacking-sd-card-slot-power/)

 
ibook_steve Aug 2, 2013 06:45 PM
Chromecast hacking: SD card slot for power
I ordered Chromecast in the first few hours after it was announced, so I hope I get the Netflix deal. In any case, I do not have USB on my TV. However, right next to the HDMI connector I never use on the side of the TV (Panasonic Viera) is an SD card slot. Maybe I could use it to power my Chromecast through an SD card adapter...

Well, before I even finish typing this, I looked at Wikipedia and learned that SD is 3.3 V and USB is 5 V, which means I would need a boost circuit, a little more complicated than I was expecting. A little Googling didn't find any hacks like this either. Hmm. Well, just one more cable I'll need to hook up.

Steve
 
P Aug 3, 2013 03:47 AM
Can't you just put a powered hub somewhere behind the TV?
 
ibook_steve Aug 6, 2013 02:20 PM
The whole point is that I don't want to go to my power strip, either with the included adapter or through a hub. I've actually found a few boost converters on ready made little circuit boards that could probably do the job, though since I don't have my Chromecast yet, I don't know what its power requirements are and if the power from a standard SD card slot is enough (probably not).

Steve
 
subego Aug 6, 2013 03:37 PM
I think SD card slots max out at 10-15mA at 3.3v vs. 100mA at 5v for USB.
 
ibook_steve Aug 6, 2013 05:56 PM
Quote, Originally Posted by subego (Post 4241497)
I think SD card slots max out at 10-15mA at 3.3v vs. 100mA at 5v for USB.
Yeah, I just got my Chromecast and the power adapter included is rated at 850 mA at 5 V. That doesn't necessarily mean Chromecast uses that much, but I'm pretty sure at this point my idea is dead in the water.

Steve
 
shifuimam Aug 6, 2013 09:24 PM
If you wanted to get fancy, you could make something that sits between your TV and your TV's power cable (assuming your TV uses a standard power cable) that outputs 5V 1A DC over a USB port for plugging in the Chromecast. It wouldn't be terribly hard to do, especially since you can get tiny-ass USB power adapters now.
 
mduell Aug 6, 2013 11:42 PM
If you want to get hacky you can probably find a low voltage DC line inside the TV somewhere...
 
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