Past Student Work

Drawing Device Documentation [UPDATED]

Posted by Sabrina on

by Carlos Cuevas

Here’s the documentation of my drawing device! With a little help from Sabrina with the code and Alejandro with wiring, I was finally able to get this to work! It’s a little different from the concept I drew up because I didn’t attach a disc to the motor just to save time and keep it simple, considering this is weeks late..

#include <Servo.h>

Servo myservo;  // create servo object to control a servo 

int potpin = A0;  // analog pin used to connect the potentiometer
int val; 
int motorPin = 3;  // define the pin the motor is connected to
                   // (if you use pin 9,10,11 or 3you can also control speed)
const int  buttonPin = 7;    // the pin that the pushbutton is attached to
//const int ledPin = 13;       // the pin that the LED is attached to

// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button

/*
 * setup() – this function runs once when you turn your Arduino on
 * We set the motors pin to be an output (turning the pin high (+5v) or low (ground) (-))
 * rather than an input (checking whether a pin is high or low)
 */
void setup()
{
 myservo.attach(9);
 pinMode(motorPin, OUTPUT); 
 pinMode(buttonPin, INPUT);
 Serial.begin(9600);
}

/*
 * loop() – this function will start after setup finishes and then repeat
 * we call a function called motorOnThenOff()
 */

void loop()                     // run over and over again
{
 buttonState = digitalRead(buttonPin);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button
      // wend from off to on:
      buttonPushCounter++;
     // Serial.println(“on”);
      //Serial.print(“number of button pushes:  “);
     // Serial.println(buttonPushCounter);
    } 
    else {
      // if the current state is LOW then the button
      // wend from on to off:
     // Serial.println(“off”); 
    }
  }
  // save the current state as the last state, 
  //for next time through the loop
  lastButtonState = buttonState;

  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo.write(val);    // sets the servo position according to the scaled value 
  delay(5);
  
  if (buttonPushCounter % 2 == 0) 
  {
  //  digitalWrite(ledPin, HIGH);
    //analogWrite(motorPin, 150);   //sets the new speed
    int delayTime = 500; //milliseconds between each speed step
  
  //Accelerates the motor
  for(int i = 180; i < 186; i++)
  { //goes through each speed from 0 to 255
    analogWrite(motorPin, i);   //sets the new speed
    delay(delayTime);          // waits for delayTime milliseconds
  }
     //motorOnThenOff();
     //motorOnThenOffWithSpeed();
    // motorAcceleration();
  } 
  else 
  {
    analogWrite(motorPin, 0);   //sets the new speed
  }
}