Description in detail:
1) TEMPERATURE SENSOR: This is first sensor which uses to sense temperature. This can be temperature sensor, say LM35. The sensor will be placed on the front panel. One can use LCD display to read the temperature.
2) LIGHT SENSOR: This is second sensor which uses to sense light. This can be LDR. The sensor will be placed on the front panel.
3) AMPLIFIER: Output voltage of temperature sensor is in milivolts. But the ADC requires a voltage in the range of 0 to 5volts. So we need to use an amplifier. We are going to use LM324 which is having 4 inbuilt amplifiers. Since we have two sensors, we have used this Amplifier.
4) ADC We are going to use ADC 0808 which is 8 bit and 8 channel ADC. Since we have two inputs for ADC, we have used this ADC.
5) LCD: Liquid Crystal Display which is commonly known as LCD is an Alphanumeric Display it means that it can display Alphabets, Numbers as well as special symbols thus LCD is a user friendly Display device which can be used for displaying various messages unlike seven segment display which can display only numbers and some of the alphabets. The only disadvantage of LCD over seven segment is that seven segment is robust display and be visualized from a longer distance as compared to LCD. Here WE have used 16 x 2 Alphanumeric Display which means on this display WE can display two lines with maximum of 16 characters in one line.
6) MOTOR DRIVER: We need to drive the DC Motors. For this purpose we need to provide 12 volt supply to motor. Motor driver IC is used for this purpose. We are going to use L293D as a motor driver IC
7) RELAY: We need to control the values of temperature. For this purpose we need to drive a fan and heater. We are going to use Relay for this purpose
8) PC Interfacing: We are going to use MAX 232 for the purpose of PC interfacing, using this module, we can send various data like temperature, light to the PC.
9) MICRO-CONTROLLER (8051): This is the most important segment of the project, i.e. the microcontroller 8052. The controller is responsible for detection and polling of the peripherals status. It is responsible for making. It is responsible for prioritizing all the devices attached to it.
WE have used the ATMEL 89s51 microcontroller. The AT89S51 is a low-power, high-performance CMOS 4-bit microcontroller with 8K bytes of in-system programmable Flash memory. It has got 32 I/O lines, Watchdog timer, two data pointers, two 16-bit timer/counters, six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and a clock circuitry.

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