LINE FOLLOWER ROBOT
Guided By:
Mrs. Geetali Saha
Made By:
Parth Patil (130110109040)
Arsh Patel(130110109031)
KishanPatel(130110109034)
List of Components
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OPA1013D Op-amp IC………………………….1
L293D Motor Driver IC…………………………1
2k variable Resistor……………………………..2
LDR………………………….…………………………..2
White LED………………..…………………………..2
Green LED……………………..……………………..2
1k Resistor……………………….…………………..2
P-n junction diode…………….………………….2
220k resistor………………………….……………..2
200 rpm DC Motor…………………..……………4
Main Concept :
Comparator
Circuit
• Comparator compares 2 input voltage with reference voltage
and gives output in digital form.
• If Vin > Vref : output is HIGH
If Vin < Vref : output is LOW
• It is implemented using Op-Amp.
Vref in Inverting (-) Pin
Vin in Non-Inverting (+) Pin
Working
• Black and white color reflect light with different intensities.
• LDR has different values of resistance in different intensities of
white & black light.
• Voltage drop across LDR is given as input to comparator
circuit.
• Comparator Circuit checks whether light is reflected from
black line or background.
• Output is given to motor driver ic accordingly considering the
direction of turning at each signal from comparator circuit.
Schematic Diagram
Actual Photographs
Real Life Applications
• Autonomous robots in Industry.
• Autonomous transportation.
• Tour guides in museums and other similar applications