bryanr.org

Sample: S012C03AD03AF03AF0000 03000216000000000095044B0 703
Key   : S012Caaaabbbbccccllll ????????????????????????? d?e

Sample: 0000014301FF 0205 00C1 0062 23230000 23230000 03AE 
Key   : ???????????? ffff ???? iiii ???????? jjjjkkkk ????

Sample: 03D0 03AA 0095 1006002C0511
Key   : gggg hhhh mmmm ???????????1

(Normally it's all on one line; split here for readability)

Key:

aaaa -> cell 1 voltage (hex)
bbbb -> cell 2 voltage
cccc -> cell 3 voltage
llll -> cell 4 voltage
  unit = 4mV

d - state:
  - 1 discharging
  - 2?
  - 4 waiting for battery
  - 5?
  - 6 charging battery
  - 7 balancing battery
  - 9 charge complete

e - number of cells (1-based)

ffff -> supply voltage (0205=12.20V)
 -> unit = 23.59375mV

gggg - battery percentage
     00AA = 17%
     0300 = 77%
     03AA = 94%
     1000 = 410%
     -> unit = 0.10%

hhhh - battery percentage when first connected (?)

iiii - seconds elapsed

jjjj - mAh in lower (1000 hex = 11 mAh; 8000 hex = 91 mAh)
kkkk - mAh in upper (1000 hex = 745472 mAh; 0100 = 46592; 0001 = 182 mAh)

mmmm - charge current
     - 1000 = 25A (unit = 6.10mAh)

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• Headphone Jack. But it's a hassle to connect a cable all the time. And the headphone output on the HTC EVO is almost 1990s-laptop-bad; it's pretty clear that HTC cut corners on the analog filtering. The bass is badly distorted.
• USB. Apparently some head units can mount a smartphone as a USB storage device, and then play audio from it. This approach requires only 1 cable to both charge, and get audio from, the phone. And it can provide high quality given the decoder, DAC, and amp are entirely outside the phone. But, I want to control playback from the phone itself, and don't have (nor want to buy) one of the few headunits that support USB. Finally, the USB storage approach is incompatible with streaming audio over 3G (Pandora).
• HDMI. Might be possible, but still has the cabling problem.
• Phone-as-Wifi-AP: This is not so bad -- allows lossless audio streaming over IP, but, it prevents the phone itself from accessing the Internet via wifi (which is a bummer when parked outside a Starbucks).
• Ad-Hoc Wifi: Isn't supported by Android yet
• Car-as-Wifi-AP: More difficult to implement (most USB Wifi dongles don't support AP mode in Linux; I don't want to add a standalone AP in addition to the CarPC). And it would probably break internet access on the phone, as the CarPC is not a gateway.
• Bluetooth: Connect a $20 USB BT dongle and then use the CarPC as an A2DP SBC sink (or, buy/build a standalone BT DAC). Unfortunately, Android doesn't support A2DP MP3 or AptX, and SBC is a poor codec. But the headphone output on the EVO is so aweful, that a good USB DAC on the CarPC should easily beat it, even after the SBC losses. And this approach doesn't require cabling and doesn't conflict with internet access over wifi.

Here's how to get it working

Just giving this some PageRank help, to hopefully improve Google's mostly old/wrong/useless results on this topic.

Tuning Solid State Drives in Linux

sudo apt-get install barry-util

And then plug it in.

There's also a kernel module for this. But, the userspace option above is nicer.

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http://www.google.com/finance?catid=60918252&sort=MARKET_CAP#link_Market Cap

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