/********************************************************************
* SparkFun Inventor's Kit
* Example sketch 12
*
* SPINNING A MOTOR
*
* This example requires that you drive your motor using a switching
* transistor. The Arduino is only capable of sourcing about 40 mA of
* current per pin and a motor requires upwards of 150 mA.
*
* Look at the wiring diagram in the SIK Guide - Circuit #12 or read the
* notes in the readme tab for more information on wiring.
*
* This sketch was written by SparkFun Electronics,
* with lots of help from the Arduino community.
* This code is completely free for any use.
* Visit http://learn.sparkfun.com/products/2 for SIK information.
* Visit http://www.arduino.cc to learn about the Arduino.
*
* Version 2.0 6/2012 MDG
* Version 2.1 8/2014 BCH
*******************************************************************/

const int motorPin = 9; // Connect the base of the transistor to pin 9.
// Even though it's not directly connected to the motor,
// we'll call it the 'motorPin'

void setup()
{
pinMode(motorPin, OUTPUT); // set up the pin as an OUTPUT
Serial.begin(9600); // initialize Serial communications
}

void loop()
{ // This example basically replicates a blink, but with the motorPin instead.
int onTime = 3000; // milliseconds to turn the motor on
int offTime = 3000; // milliseconds to turn the motor off

analogWrite(motorPin, 255); // turn the motor on (full speed)
delay(onTime); // delay for onTime milliseconds
analogWrite(motorPin, 0); // turn the motor off
delay(offTime); // delay for offTime milliseconds

// Uncomment the functions below by taking out the //. Look below for the
// code examples or documentation.

// speedUpandDown();
// serialSpeed();
}

// This function accelerates the motor to full speed,
// then decelerates back down to a stop.
void speedUpandDown()
{
int speed;
int delayTime = 20; // milliseconds between each speed step

// accelerate the motor
for(speed = 0; speed <= 255; speed++)
{
analogWrite(motorPin,speed); // set the new speed
delay(delayTime); // delay between speed steps
}
// decelerate the motor
for(speed = 255; speed >= 0; speed--)
{
analogWrite(motorPin,speed); // set the new speed
delay(delayTime); // delay between speed steps
}
}

// Input a speed from 0-255 over the Serial port
void serialSpeed()
{
int speed;

Serial.println("Type a speed (0-255) into the box above,");
Serial.println("then click [send] or press [return]");
Serial.println(); // Print a blank line

// In order to type out the above message only once,
// we'll run the rest of this function in an infinite loop:

while(true) // "true" is always true, so this will loop forever.
{
// Check to see if incoming data is available:
while (Serial.available() > 0)
{
speed = Serial.parseInt(); // parseInt() reads in the first integer value from the Serial Monitor.
speed = constrain(speed, 0, 255); // constrains the speed between 0 and 255
// because analogWrite() only works in this range.

Serial.print("Setting speed to "); // feedback and prints out the speed that you entered.
Serial.println(speed);

analogWrite(motorPin, speed); // sets the speed of the motor.
}
}
}