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int pwm_a = 3;   //PWM control for motor outputs 1 and 2 is on digital pin 3
int pwm_b = 11;  //PWM control for motor outputs 3 and 4 is on digital pin 11
int dir_a = 12;  //direction control for motor outputs 1 and 2 is on digital pin 12
int dir_b = 13;  //direction control for motor outputs 3 and 4 is on digital pin 13
int val = 0;     //value for fade

void setup()
{
  pinMode(pwm_a, OUTPUT);  //Set control pins to be outputs
  pinMode(pwm_b, OUTPUT);

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/*
 5/22/2012
  Timothy Holmberg
  SparkFun Electronics
  
  This code includes the ddition of fade in and out PWM. Also a stop feature. And the addition of individual functions for motor control 
  
  This was a revision of the example sketch that originated from Pete Dokter's code for Arduino that shows very basically how to control an Ardumoto 
  motor driver shield with a 5V Arduino controller board. http://www.sparkfun.com/datasheets/DevTools/Arduino/Ardumoto_test_3.pde
  

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/*
 http://www.arduino.cc/en/Tutorial/Button
 */
const int buttonPin = 7;     // the number of the pushbutton pin
const int green =  13;      // the number of the LED pin


void setup()
{
  pinMode(green, OUTPUT);      

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// Test sketch for El Escudo Dos
// Turn each EL channel (A-H) on in sequence and repeat
// Mike Grusin, SparkFun Electronics

  int A = 2;
  int B = 3; 
  int C = 4;
  int D = 5;
  int E = 6;
  int F = 7; 

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const int Trig_pinRight =  12;   // Triggers Pulse for RIGHT Ultrasonic Sensor
const int Echo_pinRight = 10;     // Recevies Echo for RIGHT Ultrasonic Sensor

long durationRight;            // Time it takes for pulse to bounce back to RIGHT Ultrasonic Sensor

void setup() {

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

  Serial.println("Initializing...");  // Print Initializing... to confirm code is working with Serial Library

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const int Trig_pin =  12;   // Triggers Pulse for THE Ultrasonic Sensor
const int Echo_pin = 10;     // Recevies Echo for THE Ultrasonic Sensor
int led = 13;

long duration;            // Time it takes for pulse to bounce back to THE Ultrasonic Sensor

void setup() {

    pinMode(led, OUTPUT);  
  

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const int Trig_pin =  12;   // Triggers Pulse for THE Ultrasonic Sensor
const int Echo_pin = 10;     // Recevies Echo for THE Ultrasonic Sensor
int led = 13;

long duration;            // Time it takes for pulse to bounce back to THE Ultrasonic Sensor

void setup() {

    pinMode(led, OUTPUT);  
  

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


#include <Servo.h> 
 
Servo lefty;  // create servo object to control a servo 
                // a maximum of eight servo objects can be created 
 

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#include <Servo.h> 
 
Servo lefty;  // create servo object to control a servo 
   Servo righty;             // a maximum of eight servo objects can be created 
 
int pos = 0;    // variable to store the servo position 
 
 int leftEye = 13;
 int rightEye = 12;
 

ringodin

/*
  Multiple tones from a piezo speaker
 
 circuit:
 put a small piezo speaker on digital pin 8 
 and then ground it
 (need not be a PWM pine)
 no resistor needed
 
 modified by Ringotron5000