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Everyone loves water gun fights in the summer. But you can always make something better by adding electronics to it. So I designed a set of water sensors and buzzers that will beep when they are hit with the spray of a water gun. This lets you play a game similar to laser tag but with water.

And if you want wondering, no it won't shock you or electrocute you. The circuit is well sealed in its housing and the amount of electricity that we are working with is so small that it couldn't shock you anyway.

Step 1: Watch the Video

Here is a video walkthrough of the project.

<p>How do you connect 2 components on the perf board. I mean there arn't any pre-connected holes on the board</p>
You have to create the connections. You can do this by bending the ends of the leads over so that they reach the next connection terminal. Or you can make a large drop of solder and use your soldering iron to drag it across two adjacent terminals so that they are connected.
<p>Thank you. </p>
<p>neat!</p>
<p>Why do you really need the timing chip? Can't you just build this setup using just some wires, batteries and a capacitor?</p>
I used the timer so that it would stay on for a set time then turn off.
<p>I can't seem to get it to work. I got all the components exactly as listed but piezo makes noise when there is no contact and as soon as contact is made between pin 2 and ground, the noise stops. Has anyone got an idea on why that occurs?</p>
<p>So it is doing the opposite of what it should? That could happen if the buzzer where wired to positive instead of ground. It would help if you could post a picture of both sides of the board.</p>
<p>Thanks for the suggestion. In the mean time I have been experimenting with the circuit and I noticed that if I replaced the piezo with a LED, it works perfectly. Does it have to be a specific kind of piezo? I got a KPM-1205A.</p>
<p>It shouldn't require any specific piezo. But some piezo buzzers have a polarity. So try switching the terminals on the buzzer.</p>
<p>It's been a while since my last comment but I was waiting for some new buzzers and with these it works perfectly! Very loud :) The only thing that's left is mounting it all inside the enclosure. Thanks for the help and the great project. I've already learned a lot.</p>
pure water dont conduct electricy.
<p>In most cases you are going to fill a water gun with tap water. Tap water has enough impurities in it that it will conduct enough for this project to work.</p>
<p>This is awesome!</p>
I know it says it won't shock you but in reality no matter how much voltage you're dealing with if there is water lands on the circuits you'll be shocked
Most people can't feel currents less than 5mA. That is hundred of times more current than this circuit could deliver to your skin.
What happens when water gets on the circuts
<p>good idea</p><p>like</p>
It is
Come over at 19st 1403<br>
<p>this is amazing!</p><p>Best summer project ever!!</p>
<p>This is awesome</p>
This is awesome. I'll have to try this, perfect for here in California
This is a really clever design! A great beginners electronics project too =D
<p>This is genius</p>

About This Instructable

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Bio: My name is Jason Poel Smith I am a Community Manager here at Instructables. In my free time, I am an Inventor, Maker, Hacker, Tinker ... More »
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