In that case I would use a potentiometer (or in the case of one-time adjsuting it's value - a trimmer), instead calculating the exact values of the resistors needed. Connect a 100KOhm potentiometer in parallel with your battery (use the two extreme pins - it doesn't matter which one goes to the positive side and which one goes to the negative side), and adjust it until you get 3V at the middle pin (take 3V instead of 3.3V - just for safety). When done - connect it to the IOIO, but be careful not to reverse the potentiometer pins once it set - you will get higher voltage at the middle of it. Consider a capacitor as Itay recommended.
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