30 days Money Back GuaranteeDIY Laser Tripwire Alarm Kit
A piece by piece laser alarm STEM kit
In your hands, every laser cut wooden piece slots into place and the circuit connects precisely between the LDR sensor and the laser. Press the push button, the beam lines up, and the buzzer goes off the moment it is interrupted. A real visual and audible demonstration of optical electronics, tactile and immersive.
DIY laser security science
Give this kit as an educational gift : intuitive and safe, even for a curious teenager. Thinking the laser might be dangerous? The beam is low power, suitable for educational use, with clear instructions. Sturdiness and safety are guaranteed.
Laser Alarm Kit: specifications
- Dimensions : approx. 11.5 × 7.5 × 12 cm (transmitter) and 7.5 cm deep, same base for the receiver
- Materials : cut wood, PCB, LDR sensor, 5 mW laser, plastic buzzer
- Power : 2 × AA batteries per unit (not included), connectors, on button
- Easy assembly without soldering, detailed manual included, suitable from age 10
Understanding electricity by experimenting
Electricity kits reveal the basics of an energy that is invisible yet essential to daily life. Through simple, playful builds, children (and grown-ups) learn how circuits, switches and bulbs actually work. A concrete way into science that develops curiosity, logic and observation. Perfect for learning moments at home or in the classroom. 👉 Back to electricity & circuit kitsCustomers who viewed this electricity kit also looked at
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6 reviews for DIY Laser Tripwire Alarm Kit
Once the order has been validated by our teams, we process it within 24 working hours, then it will be dispatched within 72 hours.
We deliver within an average of 7 to 14 working days. We make every effort to ensure that you receive your order as quickly as possible, without compromising the quality of our goods.
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Martin Fletcher –
Built it with my lad over a Sunday afternoon and it worked first go once the solder joints were sorted. The laser is bright enough across a hallway, and the buzzer is properly loud. Only niggle is that the instructions assume you’ve done a bit of soldering before, so a complete beginner might need a hand.
Kerry-Ann Douglas –
ordered from here again, third kit now and the packaging is always spot on. This one’s a good laugh, the photoresistor bit is clever once you see how it flips the circuit when the beam breaks. Knocked off a star because the battery holder feels a bit flimsy, but it does the job.
Margaret Ellison –
Bought for my grandson Alfie, he’s 11. Big grin when the alarm went off on his bedroom door. Lovely little kit.
Rhys Pritchard –
Decent kit in the end, but one of the screws for the mounting bracket was missing from my bag, so I had to dig one out of the shed to finish it. Took a good week longer than quoted to arrive as well. Works fine now, just a shame about the missing part.
Jonathan Green –
What a cracking kit! As someone who’s always been fascinated by lasers, this was just the thing. Managed to rig up the tripwire with minimal fuss. The little beam cuts through the room. And when it goes off? Brilliant entertainment and a bit of science rolled in.
Margaret Davies –
Bought this for my grandson. he was chuffed! The excitement in his eyes as he experimented with the laser beam was priceless. hours of fun and learning all rolled into one. Spot on gadget for a budding inventor!