batteries

Gert van Loo

... the 5 to 3v3 regulator I thought that wasted the most energy? Could you remove the 5 to 3v3 regulator and supply both 5V and 3v3 by batteries via the GPIO header? I wonder what power saving you"d make if you did all of the above? IIRC from another forum posting, ...

arm2

... the 5 to 3v3 regulator I thought that wasted the most energy? Could you remove the 5 to 3v3 regulator and supply both 5V and 3v3 by batteries via the GPIO header? I wonder what power saving you'd make if you did all of the above? IIRC from another forum posting, ...

durntdude

... with an easily portable rechargeable power source. Its become a bit more of a pain than anticipated. I know that certain rechargeable batteries rigged up 4 in series can output 4.8V when charged (which in my understanding should be fine) but they will drop below the low margin (4.5v ...

SaabFAN

... that. The first step in this project will be the design of a power supply, that provides 5V from a input-voltage of 10 to 15V (Empty Batteries, Charging Batteries). And experimenting with the software, for which i use QEMU on my Windows-Computer. And i need to find a Monitor, ...

Jongoleur

<t>Tsk.... To be honest, my thoughts exactly. But if everyone goes away to recharge their karmic batteries, then the loons will have the conch and you know what THAT means.... Oh well, I think I'll try going cold turkey for the weekend. I'll just keep ...

fortinbras

... do I do to power it up? What part(s) do I buy for at the electronics store or from the gadget place in China? What if want to run it on batteries? What parts do I buy? Can I power it with a standard USB (to mini-USB cable?) that connects to a running desktop computer? Will ...

willlim

... in july/august(if possible in time to FISL rs) , my intention is mounting inside a Headset with large earphones in one site the Rpi in anothe the batteries and auxiliary hardware(gps, gsensors, webcam...), a adapted keyboard in the forearm. The first prototype will be a very creepy thing ...

Benedict White

... Rolls Royces etc. to people who can't eat. It's also about consumers getting safe appropriate product - no lead paint on toys, batteries that dont explode in a persons hand or pocket - product thats properly recycled at end of life and much much more. No. The ...

scologic

... are all part of the reason the duty's are there. It's also about consumers getting safe appropriate product - no lead paint on toys, batteries that dont explode in a persons hand or pocket - product thats properly recycled at end of life and much much more. So all that ...

mightygoose

... if the R-Pi is the trigger point of the teen revolution, where the cyber-hoodie rules. Mount an RPi in a beanbag with batteries and you could have a media player that fits into the hood - put the lcd touchscreen on the sleeve.... the cyber-hoodie cool project no?</t>

Narishma

... intel still uses alot more power than the arm chips so i can't see intel doing well in phones. Maybe they'll do ok in tablets as they have bigger batteries. Not according to this: <URL url="http://www.anandtech.com/show/.....martphones">http://www.anandtech.com/show/.....martphones</URL></r>

idc

... to the clearance available in the Psion netbook/series 7. Hi Shaurz, my brothers got the Revos. Great machines, but the rechargeable batteries (or I think they charging circuits) all eventually failed. The beauty of the Series 5 was the ability to carry a set of spare AAs (rechargeables) ...

hajj_3

the intel still uses alot more power than the arm chips so i can't see intel doing well in phones. Maybe they'll do ok in tablets as they have bigger batteries.

hzrnbgy

... is the I/O power runs at 1.8V and the wireless transceiver needs at least 2V. The xmega16 can run from 1.6 to 3.6V. That's the reason I still have batteries running the expansion board plus some level translators I was kinda hoping the RaspberryPi 3.3V outputs would enable me to power the board ...

vrana54

... could be hollowed out slightly), so a laptop battery would be too big. I guess the ideal would be a charging circuit for 2xCR-V3 batteries, if such a thing exists, or a circuit for charging a couple of the flat 3.7V polymer li-ion 2000mAh 5.8x54x54mm packs. Any ideas ...

peterbailey

... could be hollowed out slightly), so a laptop battery would be too big. I guess the ideal would be a charging circuit for 2xCR-V3 batteries, if such a thing exists, or a circuit for charging a couple of the flat 3.7V polymer li-ion 2000mAh 5.8x54x54mm packs. Any ideas ...

idc

... it is incredibly difficult to do, but it was absolutely brilliant not having to wait for a machine to shut down or startup and it helped the batteries to last for weeks--or days in the case of the colour-screened netbook/series 7. All the best, Ian</t>

PatrikL

<t>I still have some questions, with your calculations, five 2100mAh NiMH batteries should provide about the same runtime like one 11000mAh li-ion battery (or four 2800mAh 18650, three 4000mAh 26650 batts...), or am I wrong? But there is big difference in voltage ...

PatrikL

... it, but still I do not think it is necesessary to use it, because good li-ion batteries have almost the same capacity if they are discharged at different rates </r>

macbadger

<t>While battery power would be excellent, please bear in mind capacity. t = C/ I^n assuming good 2100mAh NiMH batteries, with a Peukerts constant = 1.3. The model B rasPi runs at 700mA so t= 2.1 / 0.7^1.3 = 3.33hrs if Peukerts constant is worse ...

marc

<t>Just finished building a circuit for using 8 AA batteries. Battery depletes in 0.1v over time and stops running at required voltage after some time. 4x. 1.2v is 5v 1.1v x4 is 4.4v below. .5 tol. 8x 1.2 is 10v 1.1v x8 ...

abishur

... give it the 5V it needs or it won't work of course, but that is part of the reason why they did go with the USB form factor PSU. In powering from batteries, my plan is to use a grouping (specific number to be determined) of AA batteries in conjunction with an voltage booster. Wire a couple of ...

Lob0426

... business. As to the power issue intel has always looked more to the home and business desktop products. Now the world is living life on batteries and Intel is adapting or it will decline. The Atom series is their opening shot and I forsee that they will produce some very low power products ...

stormy1

... interesting) circuit relying on a zenner diode. The downside is you will loose some efficiency, and would need to make sure the voltage from the batteries does not drop below about 7(?) volts (it"s a long time since I made one) so think 5 or 6 AA"s. You would also need to think about removing ...

geomore

... through this thread felt compelled to register and comment... I have been considering in the back of my my mind how I might power my berry on batteries. I remember reading somewhere that the 5V supply needs to be carefully regulated as it is fed directly to USB ports etc. As someone mentioned, ...

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