Picture of Safety lamp for helmet cycling
This project presents the more simple and cheap way to make a small lamp of safety into the back of a helmet for cycling.

This lamp is very useful for, in addition to lights of security that should bring the bike under seat, cyclist have again in the back of the helmet on his head, and thus better their identification by drivers and other transport.

It requires that the person who wants to build this device, have basic electricity, electronics and safety knowledge, as well as, you possess a soldering iron pen, welding and solder paste, an arc with blade and a hand drill.

Electronic devices and the small 12V battery you can get in a store of electronics (such as STEREN, for example), the tube and PVC covers is achieved at any hardware store.
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Step 1: Parts

Picture of Parts
The following materials are required to build this small security lamp:

• Electronic and hardware:
3 LED 5 mm flashing
1 switch SPST miniature
1 100 ohm resistance
1 battery 12V type 23A
1 ½ " pipe 3 cm long
2 ½ “ cover PVC
Wire breadboard
Solder and paste
1 drill 3/32 "
1 piece of sandpaper

• Tools:
1 soldering pencil
Tip tweezers and screwdriver
Small hand 1 drill
Bow with hacksaw

Step 2: Cut tube and caps

Picture of Cut tube and caps
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PVC  caps and tube cutting arc with blade is cut a piece of 3 cm in PVC pipe, and the edges of the tube are matched with the sandpaper. In addition, should be cut tops two rings approximately half a centimeter. In addition, there chipping the edges of PVC pipe ends with the sandpaper.

Step 3: Drill pipe PVC

Picture of Drill pipe PVC
With a hand drill and drill bit, drill pipe PVC, making three holes on each side symmetrically.

Must also make 3 holes of the same diameter for the pins of the switch (although we will only use 2 terminals, the third gives a better locking switch miniature).
I have a headtorch with flashing red LEDs which I've strapped to my helmet when cycling and it certainly helps me to feel safer on the road as the nights draw in. I can't believe how many people cycle around in the dark dressed in black with no lights.

I think I'm going to make one of these to keep as a spare, or maybe a load of them to give away to other cyclists. Thanks for posting it.
Hello, basic security is to roll a bike, thanks for your comment and I hope you find it useful. regards