1253Views3Replies

Author Options:

Where can I get a laser and a sensor? (preferably cheap) Answered


I'm looking for a laser that is button activated and a sensor that reacts to the laser.

Basicly I want to put the laser in the barrel of a broken bb gun and make the button so that when you pull the trigger the laser goes off. Then I want to make a circle with the sensor in the center and when you hit it  with the laser you hear a sound.

Now I am wondering where I can get a laser and a sensor that responds to it. the laser can be visible or invisible I don't really care. Also does the sensor respond to any laserbeam or is this specific?

Thanks in advance,

Michel

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
lofty
lofty

Best Answer 10 years ago

Go to the pound shop and get a cheapo laser pointer, rip the case off and solder wires to the batter contacts For the sensor you can use a photo-diode, I've used lasers and photo-diodes before for my electronics coursework, scalextic lap timer lol :) Put the photo-diode with a resistor in a voltage divider, make that trigger a monostable 555 timer and have that enable an astable 555 timer to make the noise

0
AndyGadget
AndyGadget

Answer 10 years ago

Sounds like a Best Answer to me.
Look at the 2nd circuit down HERE - You'd replace the switch with the photo-diode and may have to increase the top 47K resistor value. (You could use a 556 which is 2 x 555 in the same 'box'.)

0
lofty
lofty

Answer 10 years ago

Yup, that circuit shows pretty much what I was thinking, and a 556 is a good idea, I didn't think about that :)

If you don't have 555/556 timers you can make an astable with NAND gates / transistors /op amps and a whole heap of other things and you can create time delays with resistors and capacitors too.