A few months ago, I built a brake light from some basic tools and supplies. After a few adjustments it works very well. this design can easily be modified to fit on any bike. Hope this Instructable helps you on your next DIY project.
Sorry, but since I did not document the build process, there will not be pictures for all of the tasks.
1. Hot Glue Gun
2. Soldering Iron
3. Utility Knife (OR Wire Strippers)
4. Drill (OR you could use your soldering iron)
1. Hot Glue Stick
3. Electrical Wire ( I used 18 gauge automotive wire)
4.1 or 2 LED flashlights ( You will also need the battery pack from the LED Flashlight)
5. Limit Switch
6. Red Bike Reflector
8. Electrical Tape or Shrink Tube
9. Small Assortment of Zip-ties
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Step 1: Create the Light
Start by removing the LED"S from the flashlights. Be careful to not damage the circuit when removing it. Be sure to keep the battery pack to use as a power source.
After doing that, solder some wires onto the lights.
Use a flat head screw-driver to pry open the reflector. Then, hot glue the lights in the reflector.
Lastly, apply a dab of hot glue to keep the LED'S in place. Melt or drill an access hole for the wires.
( Since I used 2 LED'S, I put them in parallel in the wiring diagram. However, you can put them in series if you like)
Step 2: Install Limit Switch and Battery Pack
Most limit switches have a few small holes. Select a bit of zip ties and securely attach it to the brake lever. Applying a dab of hot glue is also an option.
Solder 2 wires onto each terminal of the battery pack. Cover the joint with a dab of hot glue or electrical tape if desired. Lastly, zip tie it onto the bike.
Step 3: Wire Together All Components.
Once the light, limit switch, and battery pack is installed, it is time to wire them together. Refer to the wiring diagram for help. The circuit can easily be modified to fit different electronic components (ex. another switch, resistors, buzzer, etc)
Step 4: Complete Finishing Touches.
Lastly, add electrical tape, zip ties, and shrink tube to prevent the circuit form shorting.
After that has been done, your brake light should work.