Lighting Compensator Using a Diode LED as Light Sensor and Actuator

Abstract

This work presents an electronic system capable of controlling the direct and inverse polarization applied to the terminals of a LED diode; this allows configuring it as an actuator and light sensor interchangeably. The final goal is to design a system that compensates levels, set by the user, of luminesce potency. The design is described by an Analog block and a low-tech processor Arduino UNO. The Arduino UNO allowed for the functioning of the LED to operate dually by the implemented algorithm. An equation for the developed set was defined experimentally which determines the luminesce potency that the compensating LED should provide; the duty cycle for the PWM applied to the LED terminals was calculated too. Through the developed set it was possible to measure the photocurrent given by the LED configured as light sensor and then turn it into a voltage through the analog block. FInally an algorithm was obtained to compensate luminesce potency.