Circuit Documentation

Summary

This circuit is designed to control a pair of 12V geared motors using an Arduino UNO and an L298N DC motor driver. The motors are intended to be driven based on the input from two infrared (IR) sensors. The Arduino UNO is powered by a 9V battery and also provides power to the IR sensors. The L298N motor driver interfaces with the Arduino to control the direction and speed of the motors based on the sensor inputs. The circuit is likely part of a robotic system where the IR sensors are used for navigation, such as avoiding obstacles or following a path.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Provides I/O pins for interfacing with sensors, motor drivers, and other peripherals
• Can be powered via USB or external power sources like batteries

9V Battery

• Provides power to the Arduino UNO and the motor driver
• Typically used for portable power supply in small electronics

12V Geared Motors (x2)

• Electric motors with a gearbox to provide high torque at lower speeds
• Typically used in robotics and automation for driving wheels or other mechanical parts

IR Sensors (x2)

• Sensors that detect proximity or the presence of objects using infrared light
• Commonly used in obstacle detection, line following, and other robotic applications

L298N DC Motor Driver

• A module capable of driving two DC motors with direction and speed control
• Accepts logic-level inputs from a microcontroller to control the motors

Wiring Details

Arduino UNO

• 5V pin provides power to both IR sensors
• GND pin is connected to the ground pins of the IR sensors and the GND of the L298N motor driver
• Vin pin is connected to the 5V input of the L298N motor driver to power it
• Digital pins D10 and D9 are connected to the output pins of the left and right IR sensors, respectively
• Digital pins D7, D6, D5, and D4 are connected to the IN1, IN2, IN3, and IN4 inputs of the L298N motor driver to control the motors

9V Battery

• + terminal is connected to the 12V input of the L298N motor driver to power the motors
• - terminal is connected to the GND of the Arduino UNO and the L298N motor driver

12V Geared Motors

• The terminals of each motor are connected to the OUT1, OUT2, OUT3, and OUT4 outputs of the L298N motor driver

IR Sensors

• vcc pins are connected to the 5V output of the Arduino UNO
• gnd pins are connected to the GND of the Arduino UNO
• out pins are connected to the D10 and D9 pins of the Arduino UNO for signal reading

L298N DC Motor Driver

• 12V input is connected to the + terminal of the 9V battery
• GND is connected to the - terminal of the 9V battery and the GND of the Arduino UNO
• 5V input is connected to the Vin of the Arduino UNO
• IN1, IN2, IN3, and IN4 inputs are connected to the D7, D6, D5, and D4 pins of the Arduino UNO
• OUT1, OUT2, OUT3, and OUT4 outputs are connected to the terminals of the 12V geared motors

Documented Code

#define LS 10      // left sensor
#define RS 9       // right sensor
#define LM1 7      // motor Driver in1
#define LM2 6      // motor Driver in2
#define RM1 5      // motor Driver in3
#define RM2 4      // motor Driver in4

void setup()
{
  pinMode(LS, INPUT);  // Set left sensor as input
  pinMode(RS, INPUT);  // Set right sensor as input
  pinMode(LM1, OUTPUT); // Set motor driver inputs as outputs
  pinMode(LM2, OUTPUT);
  pinMode(RM1, OUTPUT);
  pinMode(RM2, OUTPUT);
}

void loop()
{
  // Read sensor values and control motor driver outputs accordingly
  if(!digitalRead(LS) && !digitalRead(RS))  
  {
    // Move forward
    digitalWrite(LM1, HIGH);
    digitalWrite(LM2, LOW);
    digitalWrite(RM1, HIGH);
    digitalWrite(RM2, LOW);
  }
  
  if(digitalRead(LS) && !digitalRead(RS))     
  {
    // Turn left
    digitalWrite(LM1, LOW);
    digitalWrite(LM2, LOW);
    digitalWrite(RM1, HIGH);
    digitalWrite(RM2, LOW);
  }
  
  if(!digitalRead(LS) && digitalRead(RS))     
  {
    // Turn right
    digitalWrite(LM1, HIGH);
    digitalWrite(LM2, LOW);
    digitalWrite(RM1, LOW);
    digitalWrite(RM2, LOW);
  }
  
  if(digitalRead(LS) && digitalRead(RS))    
  {
    // Stop
    digitalWrite(LM1, LOW);
    digitalWrite(LM2, LOW);
    digitalWrite(RM1, LOW);
    digitalWrite(RM2, LOW);
  }
}

This code is designed to read inputs from two IR sensors and control the motors through the L298N motor driver. The LS and RS constants represent the left and right sensors, respectively, while LM1, LM2, RM1, and RM2 represent the motor driver inputs. The setup function initializes the sensor pins as inputs and the motor driver pins as outputs. The loop function continuously reads the sensor inputs and controls the motor outputs to move forward, turn left, turn right, or stop based on the sensor readings.