[HELP] Set the speed of 2 DC motors with H-Bridge

[Mats2006]

Hey,
I have a problem.
I want to set the two motors to different speed.
I'm using an H-Bridge.
Here's my sketch:

Code: [Select]

#define STATE_IDLE 0
#define STATE_INIT 1
#define STATE_RUNNING        2
#define STATE_EXITING        3

const int in1Pin = 5;  // H-Brücken-Eingangspins
const int in2Pin = 4;
const int in3Pin = 3;  // H-Brücken-Eingangspins
const int in4Pin = 2;
const int en1Pin = 6;
const int en2Pin = 7;
const int buttonPin = 8;

int buttonState = 0;
int Zustand;

void setup()
{
 Zustand = STATE_IDLE;
 pinMode(buttonPin, INPUT);
 pinMode(in1Pin, OUTPUT);
 pinMode(in2Pin, OUTPUT);
 pinMode(in3Pin, OUTPUT);
 pinMode(in4Pin, OUTPUT);
}

void loop()
{
 switch( Zustand )
 {
   case STATE_IDLE: Idle();
   break;
   case STATE_INIT: Init();
   break;
   case STATE_RUNNING: Run();
   break;
   case STATE_EXITING: Exiting();
   break;
 }
}

void Idle()
{
 buttonState = digitalRead(buttonPin);
 if (buttonState == HIGH) {
   Zustand = STATE_INIT;
 }
}

void Init()
{
 delay(1000);
 Zustand = STATE_RUNNING;
}

void Run()
{
 analogWrite(en1Pin,70);
 analogWrite(en2Pin,100);
 digitalWrite(in1Pin,LOW);
 digitalWrite(in2Pin,HIGH);
 delay(1500);
 digitalWrite(in1Pin,LOW);
 digitalWrite(in2Pin,LOW);
 digitalWrite(in3Pin,HIGH);
 digitalWrite(in4Pin,LOW);
 delay(5000);
 digitalWrite(in3Pin,LOW);
 digitalWrite(in4Pin,LOW);
 digitalWrite(in2Pin,LOW);
 digitalWrite(in1Pin,HIGH);
 delay(1500);
 digitalWrite(in1Pin,LOW);
 digitalWrite(in2Pin,LOW);
 Zustand = STATE_EXITING;
}
 
void Exiting()
{
 delay(1000);
 Zustand = STATE_IDLE;
}
But when I press the button, just one motor runs in the speed, given with 'en1Pin'.
Without trying to set the speed, the motors run correctly.

Hope you can help and sorry for my bad English.
Greets,
Mathis

[UKHeliBob]

Your code looks OK

Code: [Select]

  analogWrite(en1Pin,70);    //speed A
  analogWrite(en2Pin,100);    //speed B
  digitalWrite(in1Pin,LOW);  //1-2 run at speed A
  digitalWrite(in2Pin,HIGH);
  delay(1500);
  digitalWrite(in1Pin,LOW);  //1-2 stop
  digitalWrite(in2Pin,LOW);
  digitalWrite(in3Pin,HIGH); //3-4 run at speed B
  digitalWrite(in4Pin,LOW);
  delay(5000);
  digitalWrite(in3Pin,LOW);  //3-4 stop
  digitalWrite(in4Pin,LOW);
  digitalWrite(in2Pin,LOW);  //1-2 run at speed A
  digitalWrite(in1Pin,HIGH);
  delay(1500);
  digitalWrite(in1Pin,LOW);  //1-2 stop
  digitalWrite(in2Pin,LOW);
I have annotated it to help me understand what I think you are trying to do
Can you confirm that the names you have given the pins correspond to the actual inputs on the H bridges ?

[michinyon]

Do you have two H bridges, or are you somehow trying to use one ?

[Mats2006]

First, thanks for your replies.

I've connected the en1Pin to the ENB and the en2Pin to the ENA, the INPUT pins are correctly connected.
And yes I try to use one H-Bridge. And without trying to regular the speed, it works well.

[UKHeliBob]

What H bridge are you using ?   Can you provide a link to what you are using ?
If it has ENA and ENB inputs then it is almost certainly 2 H bridges, even if they are in 1 chip, possibly an L293 or similar.

[Mats2006]

Yes its an L293.

[UKHeliBob]

Did you build the circuit yourself or buy it ready made ?
If you built it yourself what is the circuit ?
If ready made is there a link to the product ?

[Mats2006]

I buyed it, here's a link:
http://my.safaribooksonline.com/getfile?item=ODMvZDlpY3B0L20vZ2VzOTg4Mzk5NjI1c2FzcjdhaWxjZW90dC9odHBvdG9tcmxjdW1zeW9yb2Vyc2VhZ2VwZTNlaWx5Z3JpYW55bXMzNjcwMTIuZ24ubGFtanBn
Evrything the same, except that I connected the ENB to Pin6 and added a second motor.

[ash901226]

for this kind of h bridge i would like to use functions actually

Code: [Select]


void Motor(boolean Dir, int Speed)
{
  int Stop;
  if (Dir ==Stop)
  {
    digitalWrite(Pin1,LOW);
    digitalWrite(Pin2,LOW);
  }
  else
  {
    digitalWrite(Pin1,Dir);
    digitalWrite(Pin2,!Dir);
    analogWrite(EnPin,Speed);
  }
}


for dir you could specify HIGH and LOW,

[AWOL]

Code: [Select]

void Motor(boolean Dir, int Speed)
{
  int Stop;
  if (Dir ==Stop)
Really bad idea. Please rethink.

[ash901226]

your write AWOL, Its should be and int instead of a  Boolean 

[Mats2006]

But where can I set the speed there?

[UKHeliBob]

I am all in favour of using functions but unless the inline code works when the inputs to the H bridge are set correctly then a function is not going to help. 

To make things even easier to understand I have written a small class to control a motor attached to an H bridge but that does depend on the basic code working, of course.

[AWOL]

your write AWOL, Its should be and int instead of a  Boolean

No, think again.
What is the value of "Stop"?

[ash901226]

ok How about this

Code: [Select]


void Motor1(boolean Pin1, boolean Pin2, int Speed)
{
  digitalWrite(in1Pin,Pin1);
  digitalWrite(in2Pin,Pin2);
  analogWrite(en1Pin,Speed);
}
void Motor2(boolean Pin1, boolean Pin2, int Speed)
{
  digitalWrite(in3Pin,Pin1);
  digitalWrite(in4Pin,Pin2);
  analogWrite(en2Pin,Speed);
}