High Current Motor Driver | Arduino VNH2SP30 Driver Tutorial

High Current DC Motor Driver Introduction

Recently, I published an article on L293D piggy backing for driving high current motors. That came up when I was building a remote controlled robot with 6 high current, high speed DC Motors.

Even though it could drive motors effortlessly, it generated too much heat if used for more than 10 minutes straight.

So, I checked for other DC motor drivers that could drive these DC motors without much heat dissipation. Then I came up with VNH2SP30 DC Motor Driver. This one was relatively cheap and easily available. So I decided to give it a shot.

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VNH2SP30 Motor Driver

Get Your VNHSP30 Motor Driver From Here

VNH2SP30 is an awesome high current full bridge motor driver made for high current applications such as driving heavy Stepper/DC Motors and a wide range of automotive purposes. This board adds a dual monolithic high side driver and two low side switches.

VNH2SP30 Specification

• Maximum Voltage: 16V
• Peak Current: 30 A
• Practical Continuous Current: 14 A
• Dedicated Pin for Current Sensing
• MOSFET on-resistance: 19 mΩ (per leg)
• Maximum PWM frequency: 20 kHz
• Thermal Shutdown
• Undervoltage & Overvoltage Shutdown.

VNH2SP30 Pin Functions

INA and INB used to control the direction of Motor; whether clockwise or anti clockwise.

PWM pin can be used to control the speed of the rotation of motor and top turn it on or off.

Basically these are the 3 pins you need to drive the motor.

Then we have another pin that can be used to measure the output current. Current Sense (CS) pins will output a voltage proportional to the current drawn (0.13 volts per amp) of output current.

Motor Power Supply – There are two ports where you can provide a voltage to drive the motor.

IC Pwer Supply – There are VCC and Gnd pins where you provide a voltage of 5V for the working of the internal circuitry.

Controlling DC Motor using Arduino and VNH2SP30 Motor Driver

We will now connect Arduino to VNH2SP30 and write a single code to rotate DC motor clock wise and counter clock wise and control their speed using Arduino and VNH2SP30 motor driver.

VNH2SP30 —– Arduino Connections

• Vcc ——- 5 V
• Gnd ——- 0 V
• A1 ——- Pin 13
• A2 ——- Pin 2
• PWM ——- Pin 3
• Motor + ——- 12 V
• Motor – ——- 0 V
• Motor 1 Terminal 1 ——- To Motor
• Motor 1 Terminal 2 ——- To Motor

VNH2SP30 Arduino Code

define MOTOR_A1_PIN 13
define MOTOR_B1_PIN 12
define PWM_MOTOR_1 3

void setup()
{
Serial.begin(9600);
pinMode(MOTOR_A1_PIN, OUTPUT);
pinMode(MOTOR_B1_PIN, OUTPUT);
pinMode(PWM_MOTOR_1, OUTPUT);
}

void loop()
{
clock();
delay(3000);
counter_clock();
delay(3000);
}

void clock()
{
motor1_speed=100;
analogWrite(PWM_MOTOR_1, motor1_speed);
digitalWrite(MOTOR_A1_PIN, HIGH);
digitalWrite(MOTOR_B1_PIN, LOW);
Serial.println(“Moving Clockwise”);
}
void counter_clock()
{
motor1_speed=50;
analogWrite(PWM_MOTOR_1, motor1_speed);
digitalWrite(MOTOR_A1_PIN, LOW);
digitalWrite(MOTOR_B1_PIN, HIGH);
Serial.println(“Moving Counter Clock Wise”);
}

As simple as that. You can simply modify this code to rotate the motor whichever way you want.

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