Describe the design of a simple home automation system

[Guest ca123ner]

hi,
Describe the design of a simple home automation system. The required functionalities of the system are:
- Temperature and ventilation control
- Lighting control
It should be possible for the user to set some parameters of the system like required temperature, humidity or time at which the electric light should be reduced or turn on/off in a particular room and at selected time. Also an automated mode should be provided in which the system adjusts conditions according to the number of people in a room and the day time. The system should be connected to the Internet network to provide the remote control functionality for the user.
Design the structure of the system, select components and sketch the structure of the system software.

I dont know how to do it.Can you help me about this topic.
thank you,

[Guest yelong98]

Hi, could you pls describe the exactly problem ? Or you just want a whole system design ?

[angophora]

I designed a sensor interface for a computer if that helps.

http://sites.google.com/site/angophoraelectronics/projects/temperature-humidity-sensor

  Micro-controller                    ATMEGA8A
  Humidity sensor                    HONEYWELL HCH-1000-002
  Temperature sensor              LM335AZ
  Crystal                                  3.6864 MHz
  Serial interface                      MAX232
  Humidity Sensor Interface    74HC4060

Component cost is about $36 USD.