Introduction: Brake Light and Turning Signal Lights for Bicycle

I want to buy a signal light for my bike but all of them don't work in real life. So I made it and want to share with you.


  1. Use only 2 Ni-Mh batteries.
  2. Use high brightness LEDs (2.2v).
  3. Turn left-right signal in flash mode and can adjust interval.
  4. Have emergency switch (flash 4 lights) like a car.
  5. Have night light and brake light.
  6. Have buzzer flash sound when turn left, turn right and emergency modes (have switch to mute).
  7. Support both front and rear sides.
  8. Cheapest and easiest to do.

I bought 2 of these bike lights only $1 per set in my local store. One for front and the other one for rear. Come with 7 flash modes. But use only 1 push switch which hard to use in real life. I removed the print circuit. Keep only case and bright 5mm LEDs.

Step 1: Test Circuit

This is the test circuit. By the way, the turning switch should be 3 positions. I will draw the final circuit soon.