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Topic: [SOLVED] Arduino Resets With LCD and Stepper Motor (Read 1 time) previous topic - next topic

makerinchief

Oct 25, 2017, 11:47 pm Last Edit: Dec 22, 2017, 06:17 pm by makerinchief
I'm using an Arduino Nano to control a stepper motor and LCD.  I have a button as an input for controlling the state of the stepper, a button to reset the Arduino and potentiometers to control the number of rotations for the stepper. 

The idea is for the user to set the number of forward and backward rotations using the two potentiometers then press the button to start.  The Arduino counts the number of forward rotations the stepper has gone through then goes backwards.  Once the number of backward rotations has been achieved, it stops.  There is a reset button to start the process again. 

My issue is, when the Arduino is running off a power supply, it resets when I press the button to start the stepper rotations.  All seems fine when the Arduino is plugged into my USB port.

Things I've tried:

- Run the 5 volt line for all inputs from voltage regulator
- Run the 5 volt line for LCD from voltage regulator
- Use a separate voltage regulator for LCD
- Use resistors to limit current draw from digital pins to LCD
- Use resistors to limit current draw from digital pins to stepper motor
- Tried using 9V/650 mA, 12V/1A, 12V/3A power supplies
- Tried placing a capacitor between VSS(Ground) and VDD(+5V) of LCD

All to no avail. 

Apologies if there are errors in my breadboard layout.  I'll make necessary changes but as I said, it works when connected to a USB port. 

Here is the stepper:

Stepper Motor

Code: [Select]


#include <AccelStepper.h>
#include <LiquidCrystal.h>
#include <Bounce2.h>
AccelStepper stepper(4, 3, 4, 5, 6); //4 wire stepper, blue, red, green, black
//LiquidCrystal lcd(6, 7, 5, 4, 3, 2);  //RS, E, D4, D5, D6, D7
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);  //RS, E, D4, D5, D6, D7
Bounce button = Bounce();


const int fullStepCount = 200;
int stepPos = 0;
int stepCounter = 0;


int FstepperCounter = 0; //Counts the forward rotations
int BstepperCounter = 0; //Counts the backward rotations


int buttonPin = 2;
boolean buttonOn = false;

int forwardCount = 0;
int backwardCount = 0;
int currentCounter = 0;

int buzzer = 13;
//String directionText = "";

//Twister State: 0 = OFF, 1 = FORWARD, 2 = BACKWARD, 3 = FINISHED
int twisterState = 0;

//Poteniometer Settings
int potOne = 0;
int potTwo = 1;
int potOneVal = 0;
int potTwoVal = 0;
int mapPotOneVal = 0;
int mapPotTwoVal = 0;

void setup() {
  Serial.begin(9600);

  stepper.setMaxSpeed(500);
  stepper.setAcceleration(200);
  button.attach(buttonPin);
  button.interval(5);

  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Hello");
  delay(2000);

  lcd.clear();
  lcd.print("Tetrode Twister");
  lcd.setCursor(0, 1);
  lcd.print("Version 2.0");
  delay(2000);

  lcd.clear();
  lcd.print("Live Free");
  lcd.setCursor(0, 1);
  lcd.print("Or Die Hard!");
  delay(2000);
  lcd.clear();

  pinMode(buzzer, OUTPUT);
}

unsigned long prev = 0;
int inter = 200;


void loop() {

  updatePots();
  updateLCD();



  updateStepper();
}

void updateStepper() {

  stepper.run();
  button.update();

  boolean newState = button.rose();

  if (newState == true) {
    buttonOn = !buttonOn;
    twisterState = 1;
  }

  if (buttonOn == false) {
    twisterState = 0;
  }

  if (twisterState == 1) {
    stepper.move(200);
    stepPos = abs(stepper.currentPosition());

    stepCounter = stepPos % fullStepCount;
    if (stepCounter == 100) {
      currentCounter += 1;

      //delay(10);
    }
    if (currentCounter > forwardCount) {
      twisterState = 2;
      currentCounter = 0;
    }
  }

  else if (twisterState == 2) {
    stepper.move(-200);
    stepPos = abs(stepper.currentPosition());

    stepCounter = stepPos % fullStepCount;

    if (stepCounter == 100) {
      currentCounter += 1;

      //delay(10);
    }
    if (currentCounter > forwardCount) {
      twisterState = 3;
      currentCounter = 0;
    }
  } else if (twisterState == 0 || twisterState == 3) {
    stepper.move(0);
  }


  Serial.println(stepCounter);
  Serial.print("\t");
  Serial.print(FstepperCounter);
  Serial.print("\t");
  Serial.print(BstepperCounter);
  Serial.print(currentCounter);
  Serial.print("\t");
  Serial.println(twisterState);

  delay(10);
}

void updateLCD() {

  //if (twisterState < 3) {
  if (twisterState == 0) {
    lcd.setCursor(0, 0);
    lcd.print("FOR:");
    lcd.setCursor(4, 0);
    lcd.print("   ");
    lcd.setCursor(4, 0);
    lcd.print(forwardCount);

    lcd.setCursor(8, 0);
    lcd.print("REV:");
    lcd.setCursor(12, 0);
    lcd.print("   ");
    lcd.setCursor(12, 0);
    lcd.print(backwardCount);
  } else if ( twisterState == 1 || twisterState == 2) {

    lcd.setCursor(0, 0);
    lcd.print("FOR:");
    lcd.setCursor(4, 0);
    lcd.print(forwardCount);

    lcd.setCursor(8, 0);
    lcd.print("REV:");
    lcd.setCursor(12, 0);
    lcd.print(backwardCount);


    lcd.setCursor(0, 1);
    lcd.print("COUNT:");

    lcd.setCursor(6, 1);
    lcd.print(currentCounter);

    lcd.setCursor(9, 1);
    lcd.print("STATE:");
    lcd.setCursor(15, 1);
    lcd.print(twisterState);

  } else if (twisterState == 3) {
    delay(2000);
    lcd.clear();
    lcd.print("TWISTER FINISHED");
  }

}

void updatePots() {

  if (twisterState == 0) {
    potOneVal = analogRead(potOne);
    potTwoVal = analogRead(potTwo);
    mapPotOneVal = map(potOneVal, 0, 1023, 0, 100);
    mapPotTwoVal = map(potTwoVal, 0, 1023, 0, 100);
  }
  forwardCount = mapPotOneVal;
  backwardCount = mapPotTwoVal;
}





Grumpy_Mike

You don't seem to have any capacitors on the regulator. You need one on the input and one on the output. See the data sheet of the manufacturer of your regulator for the minimum values to use. It must be the actual  manufacturer of your regulator and not the manufacturer of another regulator with the same part number.

makerinchief

Thanks for this.  Looks like I had the capacitors wired incorrectly.

I did face a smaller issue after I got this working.  The lcd was dimming after the code ran its course.  I added a second volt regulator in between the Arduino 5v and the L293.  Everything works great!

Thanks for the help. 

Grumpy_Mike

Have you tried disconnecting that contrast pot from the 5V and just having it wired between the ground and wiper?

makerinchief

Hey Mike.  I was still facing some issues with the lcd dimming once the stepper started moving. 

I managed to fix all the problems by buying this driver breakout board:

DRV8825

https://www.pololu.com/product/2133


Works fantastic.  I'm guessing the problem was the driver chip I was originally using wasn't the best at managing the power going to the stepper.  This board was a simple fix and I was able to get rid of a lot of components I no longer needed.

Thanks again for the help. 

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