Abstract: An analog signal measurement apparatus and system that utilize light optics to trigger button input commands when the button is pressed or activated. A light beam from an infrared light emitting diode is adapted to enable users to operate electronic equipment with limited physical interaction with the equipment surfaces. Embodiments of the invention utilize a non-contact analog signal measurement that occurs with a beam of light from an infrared emitting diode is directed inside a hollow tube towards a piston that moves in and out of the tube. The beam is reflected towards an infrared receiving diode, which connects to an analog sensor that calculates the delay and beam intensity in order to determine the proximity of the piston. In embodiments, the piston is a spring-loaded structure with a leading centrally placed rod that does not obstruct the beam of light and is connected to the analog trigger button on the other end which recedes into the hollow tube when the user presses a trigger button.