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

LM35 TEMPERATURE MEASUREMENT

SCHEMATIC:

TEMPERATURE MEASUREMENT USING LM35 AND 89C51

WORKING:

TEMPERATURE SENSOR LM35 OUTPUTS ANALOG DATA WHICH IS CONVERTED INTO DIGITAL SIGNALS BY ADC0804 AND FED TO THE MICROCONTROLLER WHICH PERFORMS COMPUTATIONS AND SENDS THE INFORMATION TO LCD IN REALTIME.

ADVANTAGES:

1. CAN BE INTERFACED WITH SYSTEMS TO ACT UPON SPECIFIC TEMPERATURES

2. CAN BE USED |IN TEMPERATURE REGULATED FANS

3. AIR CONDITIONING SYSTEMS

CODE:

HEX FILE: http://snack.to/czc52ij1

SIMULATION FILE: http://snack.to/cu9abs5k

PCB LAYOUT:

AVAILABLE ON DEMAND

COST:

FULL COST: Rs 1000

LINE FOLLOWING ROBOT WITH FAULT TOLERANCE

SCHEMATICS : ( MADE IN PROTEUS ISIS )

5 SENSOR LINE FOLLOWING ROBOT USING DIFFERENTIAL DRIVE

WORKING:


1. FULL WHITE SURFACE : CONTINUE ITS PATH
2. BLACK STRIP BELOW THREE MIDDLE SENSORS: FOLLOW THE BLACK STRIP
3. BLACK STRIP BELOW TWO SENSORS ( IN- LINE ) : ONE WHEEL FUNCTIONAL
4. BLACK STRIP BELOW ONE SENSOR ( IN - LINE ) :  DIFFERENTIAL DRIVE
5. BLACK STRIP BELOW EVERY SENSOR : CONTINUE THE PATH
6. BLACK STRIP ABSENT AND WHITE SURFACE AHEAD : CONTINUE THE PATH TILL
    BLACK STRIP IS UNDER THE THREE MIDDLE SENSORS
7. FOR SHARP TURNS THE TWO EXTREME SENSORS ARE USED.
8. SHARP TURN RIGHT HANDLED USING RIGHT EXTREME SENSOR AND ROBOT MOVES RIGHT
9. SHARP TURN LEFT HANDLED USING LEFT EXTREME SENSOR AND ROBOT MOVES LEFT


SENSORS:

SENSOR MADE USING Cds CELLS AND WHITE LEDS

ADVANTAGES OVER OTHER LFRS:

1. FASTER
2. LIGHT WEIGHT
3. EASY TO FABRICATE
4. CHEAPER
5. DURABLE
6. DIFFERENTIAL DRIVE
7. OPTIMIZED FOR COLLEGE COMPETITIONS

COST: 


PROJECT COST : Rs 800 ONLY

CODE: ( IN ASSEMBLY AND C )

HEX FILE: http://snack.to/cum0oa8p

SIMULATION FILES : http://snack.to/cu3qr0fn

PCB LAYOUTS: 

AVAILABLE ON DEMAND