<r>ok.<br/> the monitor needs 5V so you have to give it 5V which you can get from the batteries.<br/> the easiest way would be (if the batteries deliver more than 5V) that you connect a linear regulator like the L7805 <URL url="http://uk.mouser.com/ProductDe.....fc%3D">http://uk.mouser.com/ProductDe.....fc%3d</URL>, ...

... thing that would need to be incorporated is a means for charging the battery. Namely, a autoswitching DC->DC device that would float charge the batteries and run the device while it is plugged. You'd think it wouldn't be too hard to find seeing as how laptops and cellphones and kindles and gameboys ...

... thing that would need to be incorporated is a means for charging the battery. Namely, a autoswitching DC->DC device that would float charge the batteries and run the device while it is plugged. You'd think it wouldn't be too hard to find seeing as how laptops and cellphones and kindles and gameboys ...

... url="http://www.microchip.com/wwwpr.....e=en010555">http://www.microchip.com/wwwpr.....e=en010555</URL><br/> <br/> oh and it seems that nokia batteries have 3.6V and not 3.7V which i was stating...<br/> <br/> edit: im going to use this charging controller: L6924D -> <URL url="http://www.st.com/internet/com.....079821.pdf">http://www.st.com/internet/com.....079821.pdf</URL><br/> ...

<t>the problem with the nokia charger is if you use a nokia battery as well the voltage.<br/> since those mobile phone batteries normaly have 3.7V you could not run the usb or hdmi port which need 5V. but i bet you could still get it working with a booster of some sort...<br/> the ...

... section and indicated regarding they´re state.<br/> <br/> Charging<br/> the charging circuit is a harder nut than i first thought since the main batteries<br/> are 2 cell lipos where both cells should be charged sepperatly to maintain a long<br/> and stable battery life.<br/> it would be more ...

... and power management<br/> Several other MCU´s for power management and other stuff. details later<br/> Power<br/> 7.4V 5.2Ah 20C Lithium Polymer batteries - Connected in Paralell (2x maybe more)<br/> 0.5V 4.8Ah Mono Solar Cells 5" x 5" - Connected in Series (20x probably more..)<br/> Charger ...

<t>Quote from AmyS3 on August 4, 2011, 19:19<br/> given the 7W from the solar with a usage of 1W from the raspi should leave 6W to charge the batteries. <br/> <br/> I could be wrong, and am probably just nitpicking: The battery's charging current should be greater than the battery's discharging ...

hehe..
well im trying to figure out a shematic for that charging circuit and post it here if someone else is in need of it as well.

speaking of power supply, i need to change the batteries of my wireless keyboard.. its skipping some chars already XD

ah, you beat me to the post! That should work, just make sure you have a means of "float" charging the batteries, even solar with a continuous charge will run the risk of overcharging the batteries to... unfortunate ends.

... can make it... explode. On the other hand if you've done this kind of thing and could display a good circuit board that would be to charge the batteries while there's power and then run off the batteries during a loss of power event I'd be interested in seeing those schematics <E>:)</E> Otherwise ...

<t>i´ll definitely putting the batteries in parallel to gain a higher mAh of 10.4Ah in total.<br/> the tricky part will be the charging mechanism. im going to charge the batteries with a solar module which will supply ~7W but while the raspi ...

<t>Yes, you could theoretically get that out of the batteries, however make sure to hook your batteries up in parallel! (Hook the + terminal to the + terminal together and the - terminal to the - terminal). When batteries are hooked up in parallel ...

... HDMI (but with means to control small lcd displays) could also be usefull. If the power requirements are low enough (e.g. run for years of a few batteries when mostly idle) I might even know a commercial use...</t>