Bluetooth distorts analog read?
You can try decoupling the power for the bluetooth:



The resistor value should be tiny - 10Ω is a good value to use - don't go much higher than that.  The capacitor should be nice and big - I have shown 100µF, but bigger is better - whatever you have that's nice and big.  (Make sure you wire it the right way round - check which pin is marked as -)  You might also want to add a small capacitor (say 100nF) in parallel with the large one.