INTERFACING LDR TO 89C51

Light Dependent Resistors (LDR)

SCHEMATIC:

LDR VALUE CHANGES AS THE DISTANCE BETWEEN LAMP AND LDR VARIES

WORKING:

1. LDR GIVES ANALOG SIGNAL AS ITS OUTPUT

2. OUTPUT OF LDR IS FED TO ADC WITH A REFERENCE VOLTAGE

3. THE ADC CONVERTS THE ANALOG VALUE INTO DIGITAL SIGNAL 

4. THIS SIGNAL IS GIVEN TO MICRO CONTROLLER 

5. MICRO CONTROLLER CONVERTS IT INTO READABLE FORMAT AND DISPLAYS ON LCD

ADVANTAGES:

1. CAN BE EASILY INTEGRATED INTO HOME AUTOMATION PROJECTS

2. LESS POWER CONSUMPTION AS CMOS IC IS USED

CODE:

HEX FILE : http://snack.to/czuiy3nx

PROTEUS SIMULATION FILES : http://snack.to/cujsglic

PCB LAYOUT:

AVAILABLE ON DEMAND

COST:

FULL COST: Rs 1000