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can anyone help me with a question regarding laser tripwires? Answered

I need help! I'm absolutely new to DIYs and electronics etc but have always admired what people managed to put together on their own. So far i have only connected a computer fan to USB. I recently purchased a 'motion sensing' electronic guest saluting doorbell. it doesn't have more than a 5 maybe 6 feet range. anyway i wanted to make a laser tripwire with this (so it can also increase the range and work in the dark) so i experimented. A torchlight pointed at the sensor works fine so now i have a 'broken-beam' sensor. Getting fancier, i tried with a little cheap chinese laser, but it fluctuates too much and the sensor won't stop ringing due to the fluctuations in light! anyway, i need something with a steady beam that can keep lit for a few hours at a time - maybe some sort of laser that's plugged into an electric socket or some sort of battery? any ideas on what i can use?

Thanks, people!

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rickharris
rickharris

8 years ago

Lasers have a very tight small beam and unless mounted totally rigidly they will produce vibration induced fluctuations.

Check the mounting.

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whisp3r3r
whisp3r3r

Answer 8 years ago

useful insight.. i'll remember that in future, thanks.. but its probably the batteries, i think.. we get batteries in this country that have been on the shelves for God knows how long... Bangladesh is terrible, that way.. we don't even have a Radioshack here :(

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rickharris
rickharris

Answer 8 years ago

"we don't even have a Radioshack here"

Actually, that may not be a bad thing! :-)

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Kiteman
Kiteman

8 years ago

Maybe switch the torch for an IR LED? Still the bright, wide beam, but invisible?

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whisp3r3r
whisp3r3r

Answer 8 years ago

yea sounds good..! i can probably replace a regular LED torch's bulb(s) with IR LEDS.. i'll try it