An Automated Pool-Side Water Gun for Dogs

1#include <Servo.h>
2Servo myservo;  // create servo object to control  a servo
3
4
5/*
6 * This code controls a servo that is attached to a tube  straying out water. The servo
7 * is meant to direct the water stray randomly  between a minAngle and maxangle.  Once the 
8 * servo moves to its random position,  it will wait a random amount of time before moving again.  
9 * 
10 * By randomly  changing the direction of the water and waiting, the dog is kept entertained because  she/he is 
11 * unable to guess what the water will do next. 
12 */
13int minAngle  = 50;    // The mimimum angle of the servo
14int maxAngle = 160;   // The maximum  angle of the servo
15int pos = 0;          // The variable to store the current  servo position
16int newPos;           // The variable to store the new servo position
17
18int  minDelayStep = 10;  //The mimimum wait time between each "step" of the servo (smaller  wait time -> faster movement)
19int maxDelayStep = 100; //The maximum wait time  between each "step" of the servo (larger wait time -> slower movement)
20int  delayStep;          // The variable to store wait time between each "step" of  the servo
21
22int minWaitTime = 500;  //The mimimum wait time after the servo  has stopped moving
23int maxWaitTime = 2500;  //The maximum wait time after the  servo has stopped moving
24
25void setup() {
26  Serial.begin(9600);
27  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
28  randomSeed(analogRead(0));
29}
30
31
32/*  Before running the random code, you might want to test the servo's back and forth
33  *  action. To do this, uncomment the definition below
34 */
35//#define BackAndForthTest
36#ifdef  BackAndForthTest
37  void loop() { //Test the servo's ability to go back and forth  
38    for (pos = minAngle; pos <= maxAngle; pos += 1) { 
39      // in steps  of 1 degree
40      myservo.write(pos);              // tell servo to go to position  in variable 'pos'
41      delay(15);                       // waits for the servo  to reach the position
42    }
43    delay(1500);  //Wait a bit to indicate the  servo has reached its maximum angle
44    for (pos = maxAngle; pos >= minAngle;  pos -= 1) {
45      myservo.write(pos);              // tell servo to go to position  in variable 'pos'
46      delay(15);                       // waits for the servo  to reach the position
47    }
48    delay(1500);  //Wait a bit to indicate the  servo has reached its maximum angle
49  }
50#else
51  void loop() { //Random  loop
52      newPos = random(minAngle, maxAngle); //Randomly pick a direction to  aim
53      delayStep = random(minDelayStep, maxDelayStep); //Randomly pick the  speed to move to that new direction
54      if (pos <= newPos){  // Check if the  new postion is going up or down compared to the old position
55        for (pos;  pos <= newPos; pos += 1) {
56          myservo.write(pos);              // tell  servo to go to position in variable 'pos'
57          delay(delayStep); 
58
59          /*
60          Serial.print("posUp:");
61          Serial.print(pos);
62          Serial.print("  newPos:");
63          Serial.print(newPos);
64          Serial.print("  delay:");
65          Serial.print(delayStep);
66          Serial.print("\
67");
68          */
69        }
70      } else {
71          for (pos; pos >= newPos;  pos -= 1) {
72            myservo.write(pos);              // tell servo to go  to position in variable 'pos'
73            delay(delayStep); 
74            
75            /*
76            Serial.print("posDown:");   
77            Serial.print(pos);
78            Serial.print("  newPos:");
79            Serial.print(newPos);
80            Serial.print("  delay:");
81            Serial.print(delayStep);
82            Serial.print("\
83");
84            */
85          }
86      }
87      delay(random(minWaitTime, maxWaitTime)); //Wait a random amount of time
88  }
89#endif