Microcontroller based automated room light and fan controller

We all know that we are slowly moving towards automation which is one of the trending topics. So basically in this project we will be controlling the devices of a room according to the needs. Devices such as fan and lights will get turned on as soon as somebody enters the room and if the room is empty then it will get turned off. Above that, the speed of fan will be controlled according to the temperature of the surroundings. The system will get the temperature from the temperature sensor and it will control the speed according to the temperature, set by the user. In this project, microcontroller forms the processing part, which firstly senses the temperature and the controller then compares the data with the set temperature. If the current temperature is greater than the set temperature the controller turns ON the fan and the set speed will be proportional to the difference between the set temperature & the current temperature. If the current temperature is less than the set temperature, the fan will be turned OFF. The fan speed will change according to the temperature. There will also be a proximity sensor to check if someone is near the fan and if they are, then the fan will stay ON. Otherwise it won't. The doors of a room can be equipped with a laser obstruction detector so as to know if somebody has entered the room. As soon as somebody enters the room the devices such as fan and lights will turn ON and when the room is empty the devices will get turned off. So the energy gets saved by a huge amount. This project will be most helpful for the developing countries where saving energy is one of the most important things. As, their population faces a major part of the day fighting power cuts.