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### Topic: [HELP] Set the speed of 2 DC motors with H-Bridge (Read 2936 times)previous topic - next topic

#### Mats2006

##### Jan 31, 2013, 09:12 amLast Edit: Jan 31, 2013, 01:09 pm by Mats2006 Reason: 1
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        3const int in1Pin = 5;  // H-Brücken-Eingangspinsconst int in2Pin = 4;const int in3Pin = 3;  // H-Brücken-Eingangspinsconst 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

#1
##### Jan 31, 2013, 09:34 am
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 ?
Please do not send me PMs asking for help.  Post in the forum then everyone will benefit from seeing the questions and answers.

#### michinyon

#2
##### Jan 31, 2013, 09:36 am
Do you have two H bridges, or are you somehow trying to use one ?

#### Mats2006

#3
##### Jan 31, 2013, 09:45 am
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

#4
##### Jan 31, 2013, 10:10 am
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.
Please do not send me PMs asking for help.  Post in the forum then everyone will benefit from seeing the questions and answers.

#5
Yes its an L293.

#### UKHeliBob

#6
##### Jan 31, 2013, 11:49 am
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 ?
Please do not send me PMs asking for help.  Post in the forum then everyone will benefit from seeing the questions and answers.

#### Mats2006

#7
##### Jan 31, 2013, 12:00 pmLast Edit: Jan 31, 2013, 12:24 pm by Mats2006 Reason: 1
http://my.safaribooksonline.com/getfile?item=ODMvZDlpY3B0L20vZ2VzOTg4Mzk5NjI1c2FzcjdhaWxjZW90dC9odHBvdG9tcmxjdW1zeW9yb2Vyc2VhZ2VwZTNlaWx5Z3JpYW55bXMzNjcwMTIuZ24ubGFtanBn
Evrything the same, except that I connected the ENB to Pin6 and added a second motor.

#### ash901226

#8
##### Jan 31, 2013, 01:40 pm
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

#9
##### Jan 31, 2013, 02:05 pm
Code: [Select]
`void Motor(boolean Dir, int Speed){  int Stop;  if (Dir ==Stop)`
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

#### ash901226

#10
##### Jan 31, 2013, 02:33 pm
your write AWOL, Its should be and int instead of a  Boolean

#### Mats2006

#11
##### Jan 31, 2013, 02:37 pm
But where can I set the speed there?

#### UKHeliBob

#12
##### Jan 31, 2013, 02:40 pm
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.
Please do not send me PMs asking for help.  Post in the forum then everyone will benefit from seeing the questions and answers.

#### AWOL

#13
##### Jan 31, 2013, 02:41 pm
Quote
your write AWOL, Its should be and int instead of a  Boolean

No, think again.
What is the value of "Stop"?
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

#### ash901226

#14
##### Jan 31, 2013, 02:47 pm
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);}`

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