Arduino Motor Shield (L298N)

By
Kedai Robot
– May 23, 2011Posted in: Arduino, Manual, Shield

Introduction

This motor shield allows Arduino to drive two channel DC motors. It uses a L298N chip which deliveries output current up to 2A each channel. The speed control is achieved through conventional PWM which can be obtained from Arduino’s PWM output Pin 5 and 6. The enable/disable function of the motor control is signalled by Arduino Digital Pin 4 and 7.

The Motor shield can be powered directly from Arduino or from external power source. It is strongly encouraged to use external power supply to power the motor shield.

  • Logic Control Voltage 5V (From Arduino)
  • Motor Driven Voltage 4.8 – 35V (From Arduino or External Power Source)
  • Logic supply current Iss 36mA
  • Motor Driven current Io 2A
  • Maximum power consumption 25WT=75
  • PWM?PLL Speed control mode
  • Control signal level:
High 2.3V?Vin?5V
Low -0.3V?Vin?1.5V

Diagram

Motor Shield

Control Mode Selection Jumpers: The shield supports PWM and PLL(Phased Locked Loop) control Modes. The PWM mode uses E1 and E2 to generate PWM signal. The PLL mode uses M1 and M2 to generate phase control signal.

Control Mode Selection Jumpers

Motor Terminal: Two DC motors are connected to blue motor terminals. The male header behide the terminals are the same as the motor terminals.

Motor terminal

PWRIN? The motors can be powered by external power supply when the motor current exceeds the limits provided from the Arduino. The swith between external and Arduino power is implemented by two jumpers.

  • PWRIN: External Power
  • VIN: Arduino Power

The motors are powered by external power supply

The motors are powered by Arduino power supply

NOTE: When the motor shield is powered by external power source, make sure the external power source and Arduino have the same GND.
Control Signal Truth Table?

E1 M1 E2 M2
L X Motor 1 Disabled L X Motor 2 Disabled
H H Motor 1 Backward H H Motor 2 Backward
PWM X PWM Speed control PWM X PWM Speed control

Note?H is High level ;L is Low level ;PWM is Pulse Width Modulation signal; X is any voltage level

Pin Allocation

“PWM Mode”
Pin Function
Digital 4 Motor 2 Direction control
Digital 5 Motor 2 PWM control
Digital 6 Motor 1 PWM control
Digital 7 Motor 1 Direction control

 

“PLL Mode”
Pin Function
Digital 4 Motor 2 Enable control
Digital 5 Motor 2 Direction control
Digital 6 Motor 1 Direction control
Digital 7 Motor 1 Enable control

Sample Code

PWM Speed Control

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//Arduino PWM Speed Control?
int E1 = 6;
int M1 = 7;
int E2 = 5;
int M2 = 4;
void setup()
{
pinMode(M1, OUTPUT);
pinMode(M2, OUTPUT);
}
void loop()
{
int value;
for(value = 0 ; value <= 255; value+=5)
{
digitalWrite(M1,HIGH);
digitalWrite(M2, HIGH);
analogWrite(E1, value); //PWM Speed Control
analogWrite(E2, value); //PWM Speed Control
delay(30);
}
}

PLL Speed Control

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//Arduino PLL Speed Control?
int E1 = 7;
int M1 = 6;
int E2 = 4;
int M2 = 5;
void setup()
{
pinMode(M1, OUTPUT);
pinMode(M2, OUTPUT);
}
void loop()
{
int value;
for(value = 0 ; value <= 255; value+=5)
{
digitalWrite(M1,HIGH);
digitalWrite(M2, HIGH);
analogWrite(E1, value); //PLL Speed Control
analogWrite(E2, value); //PLL Speed Control
delay(30);
}
}

 

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