Dc motor controll?

Hi Gerhard,

If you want to hard wire motor protection, but don't have 65A limit switches, you could try something like this:

The limit switch voltage could be set by the resistors to be compatible with your digital inputs for software monitiring.

Note that if this uses PWM to adjust speed, software monitoring is more complex.

Doug

/*

* dc moto with h-bridge and 2 potentiometers and 2 buttons

* 1 button for forward at speed set by pot 1

* 2 button for bacward at speed set by pot 2

* limit switches on A4 and A5 */

/*

*RS: Pin2

*E: Pin3

*D4: Pin4

*D5: Pin5

*D6: Pin6

*D7: Pin7 */

//Include Library #include

//Initiate LCD object

LiquidCrystal lcd(2,3,4,5,6,7);

int mode1      = 28;    //switch between pin 28

int mode2      = 30;    //and pin 30

int goBut      = 32;    // feed and return button pin 32

int pot1        = A0;    // potentiometer to pin A0

int pot2        = A1;    // potentiometer to pin A1

int enable      = 10;    // to enable on h bridge

int motorPin1  = 8;      // to In1 on h bridge

int motorPin2  = 9;      // to In2 on h bride

int leftBut    = 24;    // button to 12 pull-down

int rightBut    = 26;    // button to 13 pull-down

int leftLimit  = 11;    // limit switch to A4

int rightLimit  = 12;    //limit switch to A5

int redLed      = 13;

void setup() {         // run once, when the sketch starts   

    // Begin lcd interface: 

    lcd.begin(16,2);    //Print top line 

    lcd.clear();   

    Serial.begin(9600);          // set up Serial library at 9600 bps 

    pinMode (mode1 , INPUT); 

    pinMode (mode2 , INPUT); 

    pinMode (goBut , INPUT); 

    pinMode(pot1, INPUT);         

    pinMode(pot2,INPUT); 

    pinMode(enable, OUTPUT); 

    pinMode(motorPin1, OUTPUT); 

    pinMode(motorPin2, OUTPUT); 

    pinMode(rightBut , INPUT); 

    pinMode(leftBut , INPUT); 

    pinMode(leftLimit , INPUT); 

    pinMode(rightLimit , INPUT); 

    pinMode (redLed , INPUT); 

    digitalWrite (redLed , LOW); 

    digitalWrite (motorPin1 , LOW); 

    digitalWrite (motorPin2 ,LOW); 

    digitalWrite (enable ,LOW);  }

    int getSpeed1() { 

          int x; 

          x = analogRead(pot1); 

          x /= 10; 

          x = max (x , 0); 

          x = min (x , 100); 

          return x; }

    int getSpeed2() { 

          int y; 

          y = analogRead(pot2); 

          y /= 10; 

          y = max (y ,0); 

          y = min (y , 100); 

          return y; }

    int getPot1() { 

          int v; 

          v = analogRead(pot1); 

          v /= 4; 

          v = max(v, 90); 

          v = min(v, 255); 

          return v; }

    int getPot2() { 

          int w; 

          w = analogRead(pot2); 

          w /= 4; 

          w = max(w, 90); 

          w = min(w, 255); 

          return w; }

    int motorFoward() { 

          analogWrite(motorPin1, getPot1());

          digitalWrite(enable,HIGH);

          digitalWrite(motorPin2,LOW);

          lcd.setCursor(5,1); 

          lcd.print("Left: ");  }

    int motorBackward() { 

          analogWrite(motorPin2, getPot2()); 

          digitalWrite(enable,HIGH); 

          digitalWrite(motorPin1,LOW); 

          lcd.setCursor(5,1); 

          lcd.print("Right:");  }

    int allStop() { 

          digitalWrite (motorPin1 , LOW); 

          digitalWrite(motorPin2 , LOW); 

          digitalWrite(enable ,LOW); 

          lcd.setCursor(5,1); 

          lcd.print("Ready:"); 

          digitalWrite(redLed , LOW); }

void loop() {  // run over and over again   

    lcd.setCursor(0,1); 

    lcd.print("  %"); 

    lcd.setCursor(0,1); 

    lcd.print(getSpeed1()); 

    lcd.setCursor(12,1); 

    lcd.print("  %"); 

    lcd.setCursor(12,1); 

    lcd.print(getSpeed2()); 

    delay(100);     

    if (digitalRead(mode1) == HIGH) {   

          lcd.setCursor(0 ,0);   

          lcd.print("Feed mode.  ");   

          if (digitalRead(rightBut) == HIGH && digitalRead(leftLimit) == LOW) {   

              motorFoward();  }     

          else if (digitalRead(leftBut) == HIGH && digitalRead(rightLimit) == LOW) {     

              motorBackward(); }   

          else {     

              allStop(); } } 

    else if(digitalRead(mode2) == HIGH) {   

          lcd.setCursor( 0,0);   

          lcd.print("Feed & Return.");   

          if (digitalRead(goBut) == HIGH) {

                motorFoward(); }   

          if (digitalRead(leftLimit) == HIGH) {     

              motorBackward(); }   

          if (digitalRead(rightLimit) == HIGH) {     

              allStop(); } }        // space for the feed and return mode program         

    else {   

          lcd.setCursor(0,0);   

          lcd.print("Select mode?");   

          allStop(); } }

@Gerhard_Oliver Now this is what the code should look like I think.

He used syntax, that should not be legal. ie..

"void setup()                    // run once, when the sketch starts {    // Begin lcd interface:  lcd.begin(16,2);"

NOT an HTML problem!! most likely he is on a M$ box. (this is that windows used a CR-LF pair and Unix, etc use NewLine

Do you see the problem?? Here I will show it to you in HTML:

Here I will show it to you in HTML:   void setup()                    // run once, when the sketch starts {     // Begin lcd interface:   lcd.begin(16,2);

Here I will underline it:  void setup()                    // run once, when the sketch starts {     // Begin lcd interface:   lcd.begin(16,2);

The function systax is <function return type> <function name>(<arugments, or list of arguments) { where the '{' indecats the start of the boddy of the function. and if you notice he placed a '//' or comment (to the end of the line) and then the '{' with out a newline!

enjoy

Cris