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Make certain that the battery packs have "charge protection circuits".
I found L-Ion batteries with a built in 'Protection IC'. Is this what you were referring to?
It looks like it has one... From the specs:- Made of 2 2200mAh cylindrical 18650 cells with PCB and poly switch for full protection- Built-in IC chip will prevent battery pack from over charge and over discharge and prolongs battery life- Jon
That's basically what we use. Be careful not to short the leads, as this can fry the circuit board, and then you just have a paperweight. I haven't found out whether these circuit boards can be repaired, but currently have 8 battery packs that have suffered from accidental shorts during assembly.
potentially useful for you:http://www.dimensionengineering.com/CellShield.htm
I understand the two types of IR, I just thought there may be a difference between the two titles. I picked out one, I think it will work for my application. I need it for very basic obstacle avoidance, so it will have to be more linear.http://www.acroname.com/robotics/parts/R48-IR12.htmlIt's made to report distances back to me in analog. I have already calibrated something like this, so I don't think it will be difficult. It's going to be a small robot, so the distance isn't too durastic. It's minimum is 4'', but I will equip my robot with a simple tactile sensor to detect if it hits anything, just in case Opinions?
You need an A/D converter on your micro-controller, and you need to realize the distance is not linear with voltage - I ended up building a 128 byte lookup table that I use to convert input voltage (0-1023) to distance in cm.