10 k pot regulates voltage at the analog input, you free to change , it doesn't change much as input impedance arduino 100 M.

ok thanks how abou the 1k resistor and diode should i use a higher wattage for the resistor say 1 watt? and for the diode higher current say 3Amps?.. thanks

What happens if i change the 10 k potentiometer to 50 k pot?

Hi i've followed this tutorial http://luckylarry.co.uk/arduino-projects/arduino-control-a-dc-motor-with-potentiometer-and-multiple-power-supplies/ and got it working. now here's the question:

1. If i increase the voltage say 12v 5A do i need to change materials used in the circuit?. the 1k resistor?, the diode? and potentiometer?. because when i tried it with 12v 5A the tip120 quickly becomes hot and suddenly motor stops and after 3-4 secs the motor start again but can't control it anymore with the potentiometer the motor goes on rampage.. i need to turn off the arduino to make it work again.

2. Do i need a higher potentiometer say 50k or change the 1k resistor or the diode?


3. What's better Mosfet IRF510 or Tip120?


thanks in advance

So you want a supply from the main ( 120 / 220 ) ? right ?

I have an adapter that will be plugged to 220 that has an output of 12v with 1 amp.. i want it to be my main supply for the 4 motors.. but if i want to supply from the main what should i do?

Here an idea... buy a lead-acid 6 V motocycle battery. And wire the motors direct - with the motors controller.   

but what i need is a plug supply.. i have power supply unit that i got from my computer but it's way too big to fit my system..

can i use LM317 for the 4 motors?.. split them 12v = 4 LM317 = 4 Motors.. one Lm317 for one motor?

Else just run the 12V into the Arduino DC in jack, too.

Can i also do it at the Vin input pin of arduino?.. and what's the max current and voltage can be supplied in the Vin?

I have 4 batteries which is two 12v and two 6v which i used to power my 4 motors.. stepper, servo, and two dc motor.. my stepper can operate ranging from 6-12 volts.. my two dc motors are 6volts amps of 2A. my servo is 6v-1ampere... im using arduino to control the 4 motors. everything works fine.. but....

i wan to supply my motors with only one power supply because 4 batteries are way too heavy.i'll be using an adapter with an output voltage of 12v and 1amp as my main power.. how can i supply all of my motors with one supply only and still operate the same as with using  4 batteries.. i'ts like it's centralized.. thanks..

Thanks a lot for the info you've been a great help. really appreciate it..

Thanks gonna try it out..

what's the difference of doing this..

Code:

digitalWrite(dirPin,LOW);
        if(present_position < position)
        {
        digitalWrite(clkPin,LOW);
digitalWrite(clkPin,HIGH);
        present_position++;

to this..

Code:

if(present_position < position)
        {
        digitalWrite(dirPin,LOW);
        digitalWrite(clkPin,stepperClockPhase);
        if (stepperClockPhase)
            present_position++;

Hi im controlling a stepper motor and positions them according to the button pressed. 4 positions and 4 buttons in total.. the 4 positions are as follow: 0,90,180,270;

if left button pressed go to 90 degrees
if top button pressed go return to 0 degrees
if right button pressed go to 270 degrees
if down button pressed go to 180 degrees

all works well but my problem is delay.. becoz im also controlling a servo while controlling a stepper. the servo moves from left to right but when i push the button to control the stepper the movement of the servo stops.. it first execute the rotation of the stepper.

here's the code..

Code:

void button(){
int reading1 = digitalRead(TOP_BT); 
  int reading2 = digitalRead(LEFT_BT);
  int reading3 = digitalRead(DOWN_BT);
  int reading4 = digitalRead(RIGHT_BT);
  int reading5 = digitalRead(RANDOM_BT);
 
  if (reading1 != lastReading1) {
   
    lastDebounceTime1 = millis();
   
    lastReading1 = reading1;
  }
 
  if (reading2 != lastReading2) {
   
    lastDebounceTime2 = millis();
   
    lastReading2 = reading2;
  }
 
  if (reading3 != lastReading3) {
   
    lastDebounceTime3 = millis();
   
    lastReading3 = reading3;
  }
 
  if (reading4 != lastReading4) {
   
    lastDebounceTime4 = millis();
   
    lastReading4 = reading4;
  }
 
   
   
  if(digitalRead(TOP_BT) && (millis() - lastDebounceTime1) > debounceDelay){
    MoveAbsoluteAngle(0);
   
  }
  if(digitalRead(LEFT_BT) && (millis() - lastDebounceTime2) > debounceDelay){
    MoveAbsoluteAngle(45);         // 90 degrees
 
}

  if(digitalRead(DOWN_BT) && (millis() - lastDebounceTime3) > debounceDelay){
    MoveAbsoluteAngle(90);         // 180 degrees
 
}
  if(digitalRead(RIGHT_BT) && (millis() - lastDebounceTime4) > debounceDelay){
    MoveAbsoluteAngle(135);       // 270 degrees
 
}

}


void MoveAbsolute(int position){
if (present_position<position)              // present_postion is declared globally and is initialize to 0
   {
      digitalWrite(dirPin,LOW);
      for( ; present_position<position; present_position++)
      {
         delay(5);
         digitalWrite(clkPin,LOW);
         delay(5);
         digitalWrite(clkPin,HIGH);
      }
   }
   else
   {
      digitalWrite(dirPin,HIGH);
      for( ; present_position>position; present_position--)
      {
         delay(5);
         digitalWrite(clkPin,LOW);
         delay(5);
         digitalWrite(clkPin,HIGH);
      }
   }
}


void MoveAbsoluteAngle(int degrees)
{
   int position = (50*degrees)/45; // 200 steps for 360 degrees
   MoveAbsolute(position);
}

My code works but after modifying it removing the delay. it doesn't move at all with button presses.

here's the code..

Code:

void button(){
int reading1 = digitalRead(TOP_BT); 
  int reading2 = digitalRead(LEFT_BT);
  int reading3 = digitalRead(DOWN_BT);
  int reading4 = digitalRead(RIGHT_BT);
  int reading5 = digitalRead(RANDOM_BT);
 
  if (reading1 != lastReading1) {
   
    lastDebounceTime1 = millis();
   
    lastReading1 = reading1;
  }
 
  if (reading2 != lastReading2) {
   
    lastDebounceTime2 = millis();
   
    lastReading2 = reading2;
  }
 
  if (reading3 != lastReading3) {
   
    lastDebounceTime3 = millis();
   
    lastReading3 = reading3;
  }
 
  if (reading4 != lastReading4) {
   
    lastDebounceTime4 = millis();
   
    lastReading4 = reading4;
  }
 
   
   
  if(digitalRead(TOP_BT) && (millis() - lastDebounceTime1) > debounceDelay){
    MoveAbsoluteAngle(0);
   
  }
  if(digitalRead(LEFT_BT) && (millis() - lastDebounceTime2) > debounceDelay){
    MoveAbsoluteAngle(45);         // 90 degrees
 
}

  if(digitalRead(DOWN_BT) && (millis() - lastDebounceTime3) > debounceDelay){
    MoveAbsoluteAngle(90);         // 180 degrees
 
}
  if(digitalRead(RIGHT_BT) && (millis() - lastDebounceTime4) > debounceDelay){
    MoveAbsoluteAngle(135);       // 270 degrees
 
}

}


void MoveAbsolute(int position){

  if((millis() - lastStepTime) > stepDelay)    //stepDelay = 5; and lastStepTime = 0;
    {
      digitalWrite(dirPin,LOW);
        if(present_position < position)
        {
        digitalWrite(clkPin,LOW);
digitalWrite(clkPin,HIGH);
        present_position++;
        }
     lastStepTime = millis(); 
    }   

   if((millis() - lastStepTime) > stepDelay)
    {
      digitalWrite(dirPin,HIGH);
        if(present_position > position)
        {
        digitalWrite(clkPin,LOW);
digitalWrite(clkPin,HIGH);
        present_position--;
        }
     lastStepTime = millis(); 
    }
}



void MoveAbsoluteAngle(int degrees)
{
   int position = (50*degrees)/45; // 200 steps for 360 degrees
   MoveAbsolute(position);
}

It does not work anymore with button presses.. I did the same thing with the servo removing the delay and it works well but what am i doing wrong with the stepper?.. hope somebody can help me been doing this already for 3 days..

Code:

So will sending a long stream of characters via the serial port.

yeah i've notice that.. any other way for me to do it?

Code:

Why not use delay()?

Bcoz it will stop everything.. so what im doing is changing all delays to millis()..

Thanks Pluggy gotta try that out and post the code later if i can get it to work..

Consistent indentation would help to show what's going on.
Try using the auto format tool before posting code.

ok sorry about that...

I made my own pause function.. it pauses the servo for sometime before moving again just like delay..

like this..

modified sweep code..

Code:

for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees
  {                                  // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }

delay(1000);  // pause for 1 second before executing the code below


  for(pos = 180; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees
  {                                
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }

delay(1000);  // pause for 1 second

instead of using delay i can substitute it with the function i created.. pause();
i just don't know if i did it the right way..

here's the code with indention..

Code:

/ Sweep
// by BARRAGAN <http://barraganstudio.com>
// This example code is in the public domain.


#include <Servo.h>

int move = 0;
long stepsinterval = 10;
long timepause = 1500;
long previousmillis = 0;
Servo myservo;  // create servo object to control a servo
// a maximum of eight servo objects can be created

int pos = 0;    // variable to store the servo position

void setup()
{
  myservo.attach(9);
  Serial.begin(9600);  // attaches the servo on pin 9 to the servo object
}


void loop()
{

  if(millis()-previousmillis >= stepsinterval)
  {
    previousmillis = millis();

    if (move ==  1)
    {
      pos++;
      if (pos >= 125)
        move = 0;
      myservo.write(pos);
      if (pos==125) pause();
    }
    if (move == 0)
    {
      pos --;
      if (pos <= 55) 
        move = 1;
      myservo.write(pos);
      if (pos==55) pause();   
    }
  }
}
void pause(){
  if(millis()-previousmillis >= timepause)
    previousmillis = millis();
  for(int x= 0; x<=100; x++){
    Serial.println(x,DEC);
  }
}