I am using a sharp GP2d12 IR sensor with a 4.8 V battery and trying to power a vibration motor. The motor requires a 80 mA current to start and has an operationg range of 2 -3.6 V. Unfortunately the sensor only supplies 5mA and ranges in voltage from .5-2.6 V. What OPAMP or other device can I use to get this motor to vibrate harder, the closer the object is to the sensor?