Tumblelog by Soup.io
Newer posts are loading.
You are at the newest post.
Click here to check if anything new just came in.
waka
17:12
Play fullscreen
how to build a laser tripwire or switch - YouTube

1. Connect the one end of the relay coil to the collector of the transistor.
2. Connect the other end of the coil to +V end of the power source.
3. Connect your resistor and LDR to the base of the transistor.
4. Connect the resistor to +V and the LDR to ground.
5. Connect the emitter to ground.
6. ????
7. PROFIT!!!!

also get a board for this...

Don't be the product, buy the product!

Schweinderl