Super Easy Laser Trip Wire / Alarm / Coilgun Switching

Introduction: Super Easy Laser Trip Wire / Alarm / Coilgun Switching

Switch your coilgun coils, protect your home or hook it up to a counter.

The most simple lightgate out there, yet very reliable!

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: All Parts You Need:

- 9V clip

- 10k resistor 0.25W (to transistor)

- 300 Ohm resistor (for a blue LED)

- Photo-transistor SFH 309

- BUZ 11 transistor

- Small SCR

- Slide switch (main switch)

- Momentary switch (reset button)

- Wire

- Board

- Solder

- Soldering iron

- Laser pointer (cheap key chain laser will do)

Step 2: The Steps:

If you are unexperienced with electronics, just copy the schematic 1:1

and put it on a board.

Hook up the laser to a separated battery, make it hit the phototransistor,

then switch on the board. Break the beam and the LED should light up.

EASY was not a lie, thats it. You can now switch a multistage coilgun with it,

protect your room or door.

Step 3: Instructional Video

Bit of explanation and demonstrating the set up.

Circuits Contest 2016

Participated in the
Circuits Contest 2016

Be the First to Share

    Recommendations

    • Trash to Treasure Contest

      Trash to Treasure Contest
    • Raspberry Pi Contest 2020

      Raspberry Pi Contest 2020
    • Wearables Contest

      Wearables Contest

    2 Discussions

    0
    DIY Hacks and How Tos

    This is great. These make excellent DIY security systems.

    0
    -Selfmade-
    -Selfmade-

    Reply 3 years ago

    Yep.