College of Engineering
Electrical Engineering Department
BS in Electrical Engineering
This project, the Adaptive Light Dimmer for the DC House, senses a room's light content and adjusts a lamp's light intensity accordingly, thus regulating the room's light content. The device is designed to work with renewable energy sources such as wind and solar energy. This would be useful in less developed countries where AC electricity is not well spread and renewable DC, such as solar, can be better utilized. It functions by using the TSL2561 light sensor to sense light, ATTiny85 microcontroller to output PWM to the LED driver, LT3795 LED driver to output current to an LED and LT3014 low dropout regulator to lower the input voltage and power the microcontroller and sensor. The dimmer is designed to work with a 48V input voltage and an LED. It operates from an input light range of 20 to 100 Lux. Above 100 Lux the light is off and below 20 Lux the light is fully on. The efficiency of the device is 48.7%, which can be increased with improved design.