Squirt - Arduino, motion activated water cannon

Step 3 The Code

The arduino code (or "sketch") runs when turned on. Essentially the PIR looks for motion. If it's detected it waits a random length of time between half and 3 seconds, moves the servo arm to a random position 30 degrees either side of center, fires the pump for a half second and returns the servo to center. It then waits for another random length of time and repeats. It fires 3 times then checks the PIR again to see if it detects further motion. See sketch below:

#include <ServoTimer1.h>

/*

• "Squirt". Jonathan Robson Feb 2009.

*

• A PIR activates a servo & pump. Servo moves its arm to a random position between 60 and
• 120 degrees, fires a pump for half second and returns to center (90 degrees). Cycle repeats
• 3 times at random intervals between half and 3 seconds then waits to detect further movement.
• Circuit based on http://itp.nyu.edu/physcomp/Tutorials/HighCurrentLoads
• PIR code adapted from http://www.liquidware.org/view.php?id=63
• Random code adapted from www.arduino.cc/en/Tutorial/Blink & www.arduino.cc/en/Reference/Random
• Servo code adapted from http://www.ladyada.net/make/mshield/use.html

*/

int transistorPin = 8; // transistor base connected to pin 8
ServoTimer1 servo1; // defines the servo

long randOff = 0; // Initialise a variable for the OFF time between shots
long randNumber; // Initialise a variable for servo position angle and delay between shots

void setup()
{
servo1.attach(10); //servo on pin 10
pinMode(8, OUTPUT); // set the transistor pin 8 as output to pump
pinMode(5, INPUT); // set the PIR pin 5 as input
digitalWrite(8, LOW); // defines LOW as movement
randomSeed (analogRead (0)); // randomize

}

int pinin = 0;
long countint = 0;

void loop()
{
pinin = digitalRead(5); // reads the PIR sensor
while (pinin == 0)
{
pinin = digitalRead(5);
}
servo1.write(90); //sets servo to center
randOff = random (500, 3000); // generate OFF time between 1/2 and 3 seconds
delay(randOff); // waits for a random time while OFF
servo1.write(randNumber = random(60, 120)); // servo to random position within 30 degrees of center
delay(400); //gives servo time to get there
digitalWrite(transistorPin, HIGH); // turns pump on
delay(500); //fires pump for 1/2 second
digitalWrite(transistorPin, LOW); // turns pump off
servo1.write(90); // moves servo back to center

randOff = random (500, 3000); // generate new OFF time between 1/2 and 3 seconds and repeat
delay(randOff);
servo1.write(randNumber = random(60, 120));
delay(400);
digitalWrite(transistorPin, HIGH);
delay(500);
digitalWrite(transistorPin, LOW);
servo1.write(90);

randOff = random (500, 3000); // generate OFF time between 1/2 and 3 seconds and repeat
delay(randOff);
servo1.write(randNumber = random(60, 120));
delay(400);
digitalWrite(transistorPin, HIGH);
delay(500);
digitalWrite(transistorPin, LOW);
servo1.write(90);

delay(3000); // gives the PIR time to "settle" before reading again

}

Comments

[loususi]

seriously ... this is incredible ... looks like i gotta get me the materials and start building my twist on this project ... thank you SO much

know anything about bioSensors?

[joemartens]

That is awesome! Just what I was looking for.