Chris’s Laser Target Starter Project

For my starter project, I built an LED laser target. It’s basic operation is that it responds to a laser, or any light for that matter, by using a photo-resistor. The photo-resistor changes the resistance of LEDs that are connected in series, thus variably adjusting the LED brightness based on the light intensity. There is also a potentiometer that alters the light sensitivity, so that the project can be adjusted to the ambient light level.

It is used by twisting the potentiometer, which changes the total resistance in the circuit, so that the LEDs have JUST turned off. This means that they are normally off while the circuit is in the ambient light. Then, one can shine a light (or laser) on it, which will change the brightness of the LEDs based on the intensity of the light because the photo-resistor changes the resistance of the circuit.

I really liked the project, and I thought it was fun to build! I accidentally soldered all of the LEDs in the WRONG DIRECTION, which proved to me that diodes are truly “one way tunnels” for electricity. This project improved my soldering skills (not to mention DE-Soldering skills!), as well as expanding what I knew about electronic components.

Here’s a video of me demonstrating how it works!

Thanks for reading!

– Chris

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