representation may be a six bit or eight bit value fig7 shows an alternative embodiment 700 of the improved solution in the embodiment 700 a first trace 710 is formed in close proximity to a second trace 720 second trace 720 is coupled to ground the traces 710 and 720 are electrically isolated i e they are not shorted out a layer of solder resist may be used to cover traces 710 and 720 the actuator 510 in combination with the first trace 710 and second trace 720 and solder resist 520 form a three plate capacitor with two plates 710 and 720 side by side and the actuator acting as the third plate in this embodiment the actuator does not make dc contact with either plates allowing easier mechanical alignment during manufacturing but may reduce the possible capacitance between the plates trace 710 is coupled to the measurement device fig8 shows a further alternative embodiment 800 of the improved solution in the embodiment 800 a first trace 810 a second trace 820 and a third trace 830 are formed the first trace 810 is larger than either the second trace 820 or the third trace 830 the third trace 830 is coupled to ground the second trace 820 is coupled to a logic input and the first trace 810 is coupled to the measurement device a layer of solder resist is formed over plate 810 but plates 820.