Teensy + Normal Cycling Helmet = Safety




Introduction: Teensy + Normal Cycling Helmet = Safety

In the last automation contest, I won a Teensy 3.2 and I was wondering what could I do with such a small piece.

Then it hit me! Ok, it almost hit me: a bus almost got me because the driver did not know I was going to turn right in my bicycle; even though, I was waving my hand vigorously. I wanted a solution for this problem because it is really dangerous when you are cycling in the city, especially at night.

In this instructable, I will be showing you how to make this lifesaving bicycle helmet which could really help you out to get more visibility from other users in the streets.

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Step 1: Watch the Video

First of all, watch the video so you can understand what this helmet can do. Also, you should check the Autodesk circuit bellow.

Step 2: All the Materials Needed

Electronic materials

  • Wire
  • Two 330Ω resistors
  • Two 2.2 kΩ resistors
  • Two push buttons
  • Fourteen LEDs (you can choose the colour of the LEDs)
  • A small power bank
  • Hot shrink tube
  • A Teensy board (you could use an Arduino micro but the Teensy board is way smaller)

Tools and supplies

  • A soldering iron
  • A pair of scissors
  • A glue gun
  • A nail clipper (you can use cutting pliers)
  • A lighter


  • A cycling helmet with holes (in which the buttons should fit)
  • A tictac box
  • Zip ties
  • A pouch with a belt loop (In which both the tictac box and the power bank should fit)

Step 3: The LEDs

In this step, you will be soldering the LEDs together following the schematic carefully. Don't forget to put hot shrink tube so the cables never fall off.

Step 4: The Push Buttons

Here, you will need to do what you did with the LEDs, just follow the schematic and you'll get through OK.

Step 5: Assembling All Together

You are almost done! Glue the push buttons on both sides of the helmet, then glue the LEDs on the back of the helmet (make sure they are visible enough), and place the pouch on top of the helmet using zip ties.

Once you have this done, connect all the pins to the board:

  • The left push button goes on pin number 3, and the right one goes on pin number 2
  • The left LED sing goes on pin number 9, and the right one goes on pin number 8
  • All of the grounds go on the ground pin (you will need to solder a wire to all the grounds)
  • The vcc of the push buttons go on 3.3 v of the board (you will need to solder an other wire to the vccs)

Step 6: The Finale

Once you have everything wired up, you will need to copy the program on this link (the link will send you to my repository, from there to copy the program click on 'Raw' and you could copy it and paste it on the Arduino editor) and upload the program.

How to use the helmet

To use the helmet, you need to press the button on the side you are going to turn (for example if you are turning right press the button on the right) and wait for the led to blink ten times (about five seconds) and then press again to turn the light off.

If you liked this project, please leave a comment bellow and vote for it!


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Circuits Contest 2016

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    Great way to improve safety on a bike. It increases you visibility and tells people which direction that you are going to turn.