Objective:
To build a device that has an IR laser that when broken would activate a motor. The motor would be used to either pull the pin out of a Airsoft/Paintball grenade or strike it.

The Unit:
Would be attatched to a metal frame that would hold the grenade. The frame would be forced into the ground. The IR laser would simpally need to be broken and instantly activate the motor quickly.

Thank you for your help.
SiLK

 

Your description is vague. How is the IR beam going to be broken?

If it is emitting from the box, then, it must be either reflected back to a sensor in the box or an external sensor must be used. I'm assuming you want it self-contained. If you're putting it on the ground, then you don't need a infrared laser.. You just just use infrared LEDs with a shrouded sensor to create a small field of view. You should modulate the signal so that light cannot false trigger.

Steve

 

Thank you for the reply.
The beam will be broken by feet hopefully. I only said IR because its in a very dimly lite building and I did not want anyone to see the beam. I would like it all self contained if at all possiable. I would mount it just off the floor.

 

Okay, that makes more sense.

For the simplest circuit, I would use this detector

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=475-1080-ND

with this emitter

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=751-1208-ND

Hook them up like

http://home.cogeco.ca/~rpaisley4/PhotoDetectors.html
under Basic Infrared Detector

instead having the output of the opamp connected to (first circuit)

http://www.sampson-jeff.com/tcrobowar/motor1/ver1.htm

the mosfet should be a logic level or low-gate voltage type

These are your basic guidelines

Steve

 

Thank you very much! I will post up how i get on.