Picture of Squirt - Arduino, motion activated water cannon
Squirt is a motion activated water cannon using Arduino.

This was designed for use in the garden but as it's winter we tested it in the bathroom. It works!

True motion tracking is expensive and complicated so this system activates when the victim moves into range and randomises the position of the cannon and the firing time within a limited area. The sometimes fickle readings from the PIR sensor just adds to the cannon's randomness, and therefore the fun.

This is my first Arduino project.
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Step 1: Parts

Picture of Parts
Windscreen washer pump
PIR motion detector
servo motor
TIP 120 npn transistor
10k resistor
1N4004 diode
12v rechargeable NiMH battery
on/off switch
watertight box to house the workings
Watertight reservoir
Various length 22 awg jumper leads
Soft tubing
Short length of pipe

Step 2: The circuit

Picture of The circuit
Connect the parts according to the circuit diagram below.
The PIR command wire goes to Digital pin 5 on the arduino and its positive wire goes to 3v pin and ground to ground.
Servo control wire is on pin10.
Pump is on pin 8 via the transistor 9which is protected by the diode).
The battery is a NiMH 12v connected to Vin pin via an on/off switch.

The battery, breadboard and arduino are housed inside a watertight sandwich box.
Mounted on top is the PIR which is inside a length of plastic tube to restrict its field of vision to directly ahead.

The servo is mounted on top of the water reservoir- in this case a plastic tub from the kitchen supplies department of the local supermarket. The pump is fitted near the bottom of the tub with its outlet connected to a flexible pipe from an aquarium supply shop and (rather messily) attached to the sevo arm with a lump of blu-tac.
ToXiCATOM1 year ago
cool Dude !!!!!
karrrlo2 years ago
Great projetc :) the picture of the circuit is unreadable halas :(
could you please send a bigger one ?
cstace3 years ago
There would be a market to sell something like this. The ones you buy in the shops (i.e. scarecrow) have to be hooked up to a hose outdoor water supply. If you don't have a outdoor hose this is a great option... If someone in the UK makes one I would buy it.
lltiago3 years ago
hey guy....awesome job....but could you take a better picture of the circuit..? i can´t see it exactly...thankss so much
lol Awesome and please the circute
Evil_Bert4 years ago
Can you post a better pic of the circuit?  This will be my first and I'm doing it to scare the deer away from my flowers.  I will be making some modifications, but I'll post here when done.
loususi5 years ago
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?
Kiteman5 years ago
Put it on the lawn - cats beware!

There's got to be something that will stop them "going" on my lawn...
Sprinklers anyone? XD
PKM Kiteman5 years ago
I saw a video somewhere online of a DIY device that fired a flashgun, sprayed water and possibly had some kind of noisemaker component when triggered by a motion sensor (on the kitchen counter to scare away cats).

The ssscat is a commercial solution that sprays compressed air out on detecting motion- it's a neat idea but I'm not sure about commercial compressed air- it seems to contain an unpleasant proportion of VOCs (hence schoolmates getting high huffing upside-down air dusters from the camera shop >_<).

For the ultimate solution there's always the quintessential sentry gun- I'm sure you could replace the BB gun with a water jet. I still love the end of that video seen from the sentry's point of view, it's like every motion-tracking camera in sci-fi ever.
uncre8d15 years ago
i'd really like to see a stripped-down version of this (no arduino) for use as an automatic water dispenser. is this possible?
rmd65025 years ago
The PIR I got at Halted has an analog out, I think the voltage is proportional to the measured distance. Or you could get a pair of ultrasonic detectors. Then with a bit of trigonometry you could center the spray on the motion!
Is that a Windscreen washer pump ? I have two lying around and Might use one of these .
joemartens5 years ago
That is awesome! Just what I was looking for.
omnibot5 years ago
I love it!!!
cyrozap5 years ago
You should make the title more descriptive like "Squirt: A motion activated water cannon using an Arduino.