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Cyclist’s Safety Light Circuit – Nighttime Visibility for Cyclists, Walkers, Joggers

Last Updated on July 6, 2019 by Swagatam 2 Comments

A simple flashing bicycle safety light circuit has been discussed in the following article

Table of Contents
  • Circuit Operation
  • Circuit Diagram

In many occasions when we happen to go down the road at night, it is normal to meet cyclists that are visible only when they might be within walking distance.

In case you're a bike aficionado and prefer to stroll in the dark or overnight, this rider's safety light circuit can be very useful, since it will likely be easily observable.

Circuit Operation

We have observed designs that are based on two integrated circuits 555 and 12 diodes LEDs red, but I was able to modify the design to use only 555. With this particular new made it was easy to double on the 2 groups design. LEDs (see diagram) really do not persist the same time, but that does not create much of  a problem.

Operational details of the bicycle safety light circuit

Utilizing only one circuit 555, it could be configured as an astable multivibrator (having a square waveform) for the operations.

This circuit will have two groups of 6 LEDs each.

The top group of 6 LEDs will light any time the output of 555 is low (approximately 0.75 volts) and the top group would probably switch on when the output of 555 is high (approximately 8.4 volts

This alternating light motion is very spectacular and very hard to overlook the night.

LEDs can be placed in various different optional ways:

- Two rows of LEDs as shown in the diagram,
- Two rows interspersed with LEDs, and therefore the first group is switched on but with 3 up and 3 down and then in the second group, etc..

This circuit was created to be used with a PP3 9 volt battery

Circuit Diagram

bicyclesafetylights 1

Parts list for the discussed bicycle safety light

IC1: 555 timer
D1 through D12:  red LEDs  5mm
R1: 10K resistor
R2: 100K resistor
R3 to R14: 1K 1/4 watt
C1: 10uF/25V

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Filed Under: Automobile Electronics Tagged With: Cyclist, Cyclists, Light, Nighttime, Safety, Visibility

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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Reader Interactions

Comments

  1. adesina temiloluwa says

    January 28, 2015 at 10:15 am

    welldone sir…i really appreciate your effort here i just completed an inverter project designed by u in diz link… https://www.homemade-circuits.com/2013/04/how-to-modify-square-wave-inverter-into.html?m=1. i used ne555 pwm for the Choping of d square wave…..it powers my tv,cfl even 60 watt bulb …just want to show appreciation… am gratefull
    temiloluwa from Nigeria.

    Reply
    • Swagatam says

      January 28, 2015 at 12:54 pm

      Thank you Adesina, I appreciate your efforts too. keep it up.

      Reply

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