Described herein is a method and apparatus for driving a drop ejection device to produce variable sized drops with multi-pulse waveforms. Preferably, the dimple pattern disclosed by the present invention includes dimples that are arranged such that at least a portion of neighboring dimples have one or more predetermined diameter ratios. A physical implementation of the above technique is also described. The switch is adapted to open and close the electrical circuit to generate electrical signals to the locking control system to unlock the vehicle latching mechanism.