The above was for driving solenoids.
For the mini vibration motors I'm using bjt:
I don't mind if higer voltages then 5V (lets say 7.5V) will be read as 5V (1023) and I don't mind if lower voltages then 0V (lets say -5V) will be read as 0V (0) .
I just don't want to burn my arduino.
Is adding series resistor of 10k or so between the tip of the jack to the arduino analog pin will solve that?