initiate firing of the explosive 74 depending on the particular embodiment of the invention the igniter 71 may be a semiconductor bridge scb hot wire exploding bridgewire ebw or tib igniter in some embodiments of the invention the igniter 71 may be an exploding foil initiator efi in yet other embodiments of the invention the igniter may be a non electrical based igniter such as a pressure activated igniter as a non limiting example in accordance with embodiments of the invention the igniter 71 and the primary explosive 74 form a unit 70 that is translated along an axis 86 of motion by the actuator assembly 21 see fig1 of the initiator 22 in this regard in response to the controller s 62 detecting the fire command the controller s 62 communicate an electrical signal to the actuator assembly 21 to cause the assembly 21 to translate the unit 70 along the axis 86 until the primary explosive 74 is aligned with the secondary explosive 87 as depicted in an armed state of the detonating assembly 50 in fig5 in accordance with some embodiments of the invention upon detection of the fire command the controller s 62 first activate the actuator assembly 21 to align the primary 74 and secondary 87 explosives and subsequently close the switch 68 to establish electrical communication between the downhole energy source 96 and the igniter 7 the actuator assembly 21 may include a microelectromechanical system mems based actuator 80 which moves an actuating member 84 that is attached to the unit 70 for purposes of translating the unit 70 along the axis 86 in accordance with some embodiments of.