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User’s Guide

L298P PWM Motor Drive Expansion Shield

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1. Product Overview

The L298P shield is an Arduino expansion board based on the L298 dual H‑bridge driver IC. It allows you to control two DC motors or one stepper motor, with support for PWM speed control and direction control directly from Arduino pins.

• Operating Voltage: 5V logic, motor supply 7–12V (up to 40V max with external supply)
• Current Capacity: ~2A per channel (peak)
• Motors Supported: 2 DC motors or 1 stepper motor
• Control Method: Arduino digital pins + PWM

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2. Pinout & Connections

Typical L298P shield has:

Pin/Terminal	Function
MA+, MA-	Motor A outputs
MB+, MB-	Motor B outputs
ENA	Enable/PWM for Motor A
ENB	Enable/PWM for Motor B
IN1, IN2	Control inputs for Motor A direction
IN3, IN4	Control inputs for Motor B direction
VIN	External motor supply (7–12V recommended)
5V	Logic supply (from Arduino)
GND	Ground

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3. Control Logic

Each motor channel works as an H‑bridge:

IN1	IN2	Motor A Action
HIGH	LOW	Forward
LOW	HIGH	Reverse
LOW	LOW	Stop (coast)
HIGH	HIGH	Brake

• Same logic applies for Motor B using IN3/IN4.
• Apply PWM to ENA/ENB pins for speed control.

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4. Wiring Guide (Arduino Example)

1. Plug the shield directly onto Arduino UNO/Mega.
2. Connect Motor A wires → MA+ / MA-.
3. Connect Motor B wires → MB+ / MB-.
4. Supply external motor voltage → VIN + GND terminals.
5. Arduino provides logic signals automatically via shield pin mapping.

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5. Example Arduino Code

int ENA = 9;   // PWM pin for Motor A
int IN1 = 8;
int IN2 = 7;

void setup() {
  pinMode(ENA, OUTPUT);
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
}

void loop() {
  // Forward at half speed
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  analogWrite(ENA, 128); // 50% duty cycle
  delay(2000);

  // Reverse at full speed
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  analogWrite(ENA, 255); // 100% duty cycle
  delay(2000);

  // Stop
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  analogWrite(ENA, 0);
  delay(2000);
}

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6. Applications

• Robotics: Drive two DC motors for wheels.
• Automation: Control pumps, fans, or actuators.
• Educational kits: Demonstrate PWM speed control and H‑bridge logic.
• Stepper motors: Drive bipolar stepper motors with IN1–IN4 sequencing.

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7. Best Practices

• Use external motor supply (7–12V) for reliable operation.
• Do not exceed 2A per channel.
• Always connect grounds together (Arduino + motor supply).
• Add flyback diodes or capacitors if motors cause noise.
• Use PWM for smooth speed control.

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