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Old 05-18-2011, 09:07 AM   #247 (permalink)
Daox
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Out of the 32 batteries, I got ~20 to take a charge. Obviously, the capacity is a bit low on these cells, but I'm going to play around with them until I get the new ones, and make sure my BMS works. So, thats what I've been doing... Unfortunately it hasn't been done very successfully. I've been having issues getting the celllog's alarm port to work properly. One just isn't working and one is working, but not the way I would expect it to. When hooked up over one lithium cell, I get a 3.2V differential which is expected. When the transistor closes, the voltage only drops to 1.6V. Both of these voltages are high enough to keep the optical isolators closed and thus I'm not getting the correct signal to the arduino to kill the power to the dc to dc converter and charger. I tried putting a ~3k resistor across the leads on the alarm port wires, this dropped the voltage to 1.2V. Perhaps a lower ohm resistor will drop it enough.
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