Help, laser perimeter

S

SandSnip3r

New Member

• Jul 31, 2007

• #1

where can i get the parts for the dark activated relay?**broken link removed**

and, how would i construct it?

 

P

picbits

Well-Known Member

• Jul 31, 2007

• #2

An electronics shop ???

Where abouts in the world are you based - it might help people to recommend a local supplier.

 

S

SandSnip3r

New Member

• Jul 31, 2007

• #3

im in Las Vegas, NV, USA

im going to radio shack already, but, what about on **broken link removed**?

i found the first two, the diode and 2N2222 NPN, but i cant find any others

 

S

SandSnip3r

New Member

• Jul 31, 2007

• #4

can i hook up **broken link removed** to my laser perimeter project?

 

3v0

Coop Build Coordinator

Forum Supporter

• Jul 31, 2007

• #5

RadioShack has everything you need.

CdS Photoresistors (5-Pack) Catalog #: 276-1657

5VDC/1A SPDT Micro Relay Catalog #: 275-240

 

S

SandSnip3r

New Member

• Jul 31, 2007

• #6

ok, thanks, but what about the 50k resistor and 1k?

 

S

SandSnip3r

New Member

• Jul 31, 2007

• #7

1K


50K

 

P

picbits

Well-Known Member

• Jul 31, 2007

• #8

Where does the laser come in out of curiousity ?

 

S

SandSnip3r

New Member

• Jul 31, 2007

• #9

laser is bounced around with mirrors and is shined on Photoresistor and and when beam is broken "someone walks through it" causes temporary DARKness, hence DARK activated relay.

https://youtube.com/watch?v=5rEb-KvhWqY

 

P

picbits

Well-Known Member

• Jul 31, 2007

• #10

Possibly consider using a phototransistor instead of the CDS sensor then.