Room Light Intensity Control with Temperature Monitoring System Using Arduino

The light intensity controller automatically varies the brightness of an LED light depending on the natural light available in the room. In addition to this is room temperature and humidity monitoring. This system uses an Arduino and PWM technology for controlling the intensity of the LED. LDR is used as the LUX meter. The power losses incurred in PWM switching devices is extremely low. A PWM voltage regulator is built using a LM2596 buck converter which is driven by the PWM signal from the Arduino. By mapping the LDR output values to the PWM signal duty cycle the LED light intensity is varied. In addition to the light intensity controller is a temperature monitoring system, using a DHT11 sensor to measure temperature and humidity. This system is more functional than analog dimmers and timer based light controllers. Through the intended system we aim to reduce power consumption of lights through light dimming using PWM technology. It uses the available resources and is suitable for other light dimming applications as well.