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MOTORS

Page history last edited by PBworks 16 years, 7 months ago

DC Motor Control Using the 754410 H-Bridge 

NYU Lab Asignment with Schematics and Photos

Buy them at Sparkfun

 

Sample code:

 

int PWM = 3;     // use PWM to control the speed

int A = 4;       // used for direction: A=HIGH & B=LOW

int B = 5;       // will spin in 1 direction, A=LOW & 

                 // B=HIGH will spin in the other,

                 // and A=LOW, B=LOW turns it off 

void setup()                   

{

  pinMode(PWM, OUTPUT);

  pinMode(A, OUTPUT);

  pinMode(B, OUTPUT);

}

 

void loop()                   

{

  digitalWrite(A, HIGH);

  digitalWrite(B, LOW);

  analogWrite(PWM, 255);

  delay(5000);

  digitalWrite(A, LOW);

  digitalWrite(B, HIGH);

  analogWrite(PWM, 255);

  delay(5000);          

}

 

 

 

MOSFET Control

See page 34 of Programming Notebook excepts its nice to add a small .1uF capacitor between motor + and -. This filters out bad mojo. Remember: this only spins the motor 1 way.

 

Following is a simple program to scale a potentiometer value (or other analog sensor) to the speed of a motor hooked to a MOSFET:

 

int motorPin  =  3;   

int analogValue;

int analogPin = 0;

 

void setup()

{

    pinMode(motorPin, OUTPUT);

}

   

void loop()

{

    analogValue = analogRead(analogPin);

    analogValue /= 4;

    analogWrite(motorPin, analogValue); 

}

 

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