Li-ion Charger for the NB2A (Sanguino Compatible)

Pictures of the Li-ion charger prototype are at http://tinyurl.com/yfs3ws3

The charger board and a battery are mounted underneath the NB2A microcontroller board. The 3V3 output of the charger board is connected to the external power input of the NB2A. The 3V3 output can run off of the USB 5V, the wall adapter or the battery. Pictures of the NB2A + charger are at http://tinyurl.com/ykp9ocd

(* jcl *)


www: http://www.wiblocks.com twitter: http://twitter.com/wiblocks blog: http://luciani.org

Nice. Does your charger have a battery disconnect to prevent over discharging of the battery when the battery is powering the system?

I destroyed an expensive R/C type Li battery several years ago just by forgetting it was on, powering a small 20ma display device. :'(

Lefty

I do not have a battery disconnect. The battery is connected directly to the low dropout regulator.

The batteries I plan on using have a discharge cutoff built on the control PCB that is in the battery assembly. IIRC the discharge cutoff is in the 2.5V - 2.75V range.

(* jcl *)


www: http://www.wiblocks.com twitter: http://twitter.com/wiblocks blog: http://luciani.org