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Flashlight tag is a beloved kid's game, and I always love to throw a new spin on an old classic. So just for fun, I decided to add electronics to the game and I designed some pin-on badges that beep whenever you shine light on them. This gives sort of a laser tag feel to the game, and also resolves any debates over whether a person has been tagged or not. Here's how to make it.

Step 1: Materials


Printed circuit board (Radio Shack part #276-159)
Three 1.5V button cell batteries
555 timer IC (Radio Shack #276-1723)
CdS photoresistor
1μF capacitor (4.5V or higher)
3-12V piezo buzzer (Radio Shack #273-074)
1MΩ resistor
10KΩ resistor
Heat shrink tubing
Safety pin
Large paper clip
Switch (optional)
Jumper wires
Clear plastic sheet or case
Tape

Additional tools:
Heat gun
Hot glue gun
Soldering iron
Knife
<p>I like your solution to mounting the button cells. it has always been an issue with my projects (many times I've resorted to taping the wires to the cells and hoping they won't work loose.</p>
Electrical tape will hold it together pretty well because it is stretchy.
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Nice!! I wanna build some for me and my friends. <br> <br>But i got i Question, is it possible that in your picture with the circuite, you made a mistake with the left resistor?? There is a 1k resistor, but in your To-buy-List you wrote 10k resistor?? <br> <br>I try your Plan with an Simulator and its only work with a 10k Resistor....
The 10k resistor is correct. I will fix the schematics as soon as I get a chance.

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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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