Line Follower Mini

Here’s a guide for building a line follower robot using an LM393 comparator:

Materials:

• Chassis with two DC motors and wheels
• LM393 comparator IC
• Red Led & LDR sensor array (2 or more)
• NPN Transistor for Motor driver
• Battery pack
• PCB
• Resistors
• Jumper wires
• Capacitor’s

Circuit Design:

1. IR Sensor Array:

   • Connect the sensors in a line, facing towards the ground.
   • Connect the output of each sensor to a separate input of the LM393 comparator.
   • Connect a reference voltage (e.g., 2.5V) to the other input of each comparator.

2. Comparator Circuit:

   • Configure the comparators as non-inverting, so they output a high signal when the sensor detects a dark line.
   • Connect the outputs of the comparators to the motor driver NPN.

Logic:

• If both sensors detect a dark line, the robot should move forward.
• If the left sensor detects a dark line and the right sensor doesn’t, the robot should turn right.
• If the right sensor detects a dark line and the left sensor doesn’t, the robot should turn left.
• If neither sensor detects a dark line, the robot should stop.

Assembly:

1. Build the circuit on a pcb.
2. Mount the sensor array on the front of the robot.
3. Attach the motors to the chassis.
4. Connect the battery pack.

Programming (if using a microcontroller):

• If using a microcontroller (like Arduino), write a program to implement the logic for controlling the motors based on the sensor readings.

Testing and Calibration:

1. Test the robot on a simple line course.
2. Adjust the reference voltage and sensor positions as needed to fine-tune the robot’s behavior.

Enhancements:

• Add more sensors for better line detection.
• Use a microcontroller for more complex control algorithms.
• Implement obstacle avoidance or other features.

Remember:

• Ensure proper wiring and connections for safety.
• Choose appropriate resistors and motor driver based on your motor specifications.
• Experiment with different circuit configurations and sensor arrangements for optimal performance.