DocScrutinizer05 changed the topic of #qi-hardware to: Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware
<arossdotme> looks like it's ok to use li-ion charges with li-po
<arossdotme> so whats the darn vottage to let to dischage to before the cut off point?
<arossdotme> let it discharge too
<arossdotme> it's hard to find itfo
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<arossdotme> looks like lowbat is 3.2v according to adafruit's low batt led on there products
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<DocScrutinizer05> arossdotme: I'd rather use 3500mV aka 3.5V
<DocScrutinizer05> LiIon (incl LiPo) chemistry suffers *massively* from deep discharge
<DocScrutinizer05> 3.00V is the ABS MAX deep discharge where you're supposed to dicard the cell safely when ever crossing that line
<DocScrutinizer05> aiui
<DocScrutinizer05> anyway >>90% of the available capacity of a LiIon standard chemistry cell are in a discharge voltage range between 4200mV and down to 3550mV
<DocScrutinizer05> I'd not charge the cell to >4100mV either
<DocScrutinizer05> those designs that use 4200mV-3200mV or even lower, are made for maximum effect in time of sale, not bothering at all about expected livespan of product / battery. A careully gently managed battery can live >7 years, while those "max perfomance" designs calculate with a battery livespam of < 2 years
<DocScrutinizer05> oftem < 1 year
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<arossdotme> DocScrutinizer thx iw ould like max batt life span,
<arossdotme> the chrager is setup to charge upto 4.19v if i'm not missing out the 3rd digect
<DocScrutinizer05> then use 3.55 .. 4.1V (dis)charge cycle limits
<arossdotme> which i realise now the 3rd digect makes a diff when talking about it
<arossdotme> ok
<arossdotme> the min vottage in the sys power info is something like 4.7something
<DocScrutinizer05> 4.15 is maybe still ok, 4.2 is pushing it quite a bit
<arossdotme> ok
<DocScrutinizer05> 4.7 doesn't make sense
<arossdotme> i'mm ignore that vaule then
<arossdotme> i'll
<DocScrutinizer05> 4.7 sounds like min USB VBUS voltage
<arossdotme> my bad
<arossdotme> its 3475000v
<arossdotme> it's hardware charged
<arossdotme> i'm just refering to the sys files the batt monitors use
<arossdotme> but i now have a better idea of what votage to dischage too before rechage
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<DocScrutinizer05> 3475000µV sounds like a reasonable End of Discharge Voltage
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<arossdotme> EDV so thats what its called
<arossdotme> thx
<eintopf> in german: electronische datenverarbeitung
<eintopf> s/elec/elek/
<qi-bot> eintopf meant: "in german: elektronische datenverarbeitung"
<eintopf> qi-bot: thanks
<eintopf> http://www.libreboot.org/docs/install/images/x200/x200_pomona.jpg - what's the name of such blue connector?
<eintopf> oh, I need such connector
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<eintopf> Pomona 5250
<eintopf> that's the name
<eintopf> very expensive
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<kristianpaul> wpwrak: had you looked the msp432?
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<wpwrak> kristianpaul: not really. yet another vendor-specific architecture, much like avr. why build on this if we can have nice arm-based MCUs, from so many different sources ?
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<kristianpaul> well, just thinking on the power comsuption could be not as low as the msp430 but interesting
<kristianpaul> to be honest the only 32 bits mcu i can get here is fro microchip :D
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<eintopf> I worked with the msp430
<eintopf> and it was a mess with the toolchain
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<eintopf> but I heard that ti did some project with redhat to support msp430 to "mainline" gcc
<eintopf> before it was a mess
<zeiris> I think msp432 is just an Cortex M4 with TI's modules. That doesn't sound so bad.
<zeiris> The FRAM MSP430s are very cool.
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<eintopf> and I had a hardware bug and I couldn't start the bsl via bitbanging
<eintopf> I implement a small bootloader which starts the bsl when user button is pressed application start :D
<eintopf> s/pressed/pressed after/
<qi-bot> eintopf meant: "I implement a small bootloader which starts the bsl when user button is pressed after application start :D"
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<wpwrak> zeiris: oh. msp432 is not just another msp430. i see.
<wpwrak> "The Device Descriptor Information (TLV) section contains a 128-bit true random seed " ;-) http://dilbert.com/strip/2001-10-25
<kristianpaul> Lol
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<larsc> probably even the same on each device
<wpwrak> the idea is good, but they really should have use different words to describe it
<wpwrak> larsc: no, apparently each device gets its own
<wpwrak> similar to the unique numbers other manufacturers use
<zeiris> Would trusting the silicon vendor to discard the random seed immediately after generation+burn be reasonable given that you must trust them to not insert backdoors into the silicon? :)
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<larsc> even if they'd store it, would still be pretty hard to match it to the hardware
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