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

Additional tools:
Heat gun
Hot glue gun
Soldering iron
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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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