**[Dr. Alvaro Perez-Diaz](https://alvarop.me)** _Researcher & Data Scientist_ _Senseye Predictive Maintenance, Siemens_ (#) Bicycle turn indicator: be safe!

A small turn indicator for bicycles. Comes in a compact box that can be easily attached to the saddle stem and a small switch that can be placed in the handlebar. Using the switch the rider can indicate right/left turns, which are displayed by arrow-shaped blinking LEDs. It tries to improve riding safety at night when sticking your hand out to indicate turns is not very visible.

Skills: Arduino, making.

How-to: full build instructions on <a href="https://www.instructables.com/id/DIY-Bicycle-Turn-Signal/" target="_blank">Instructables</a>.

Featured: Instructables main page.

Awards: second prize in Instructables' <a href="https://www.instructables.com/contest/bike2016/" target="_blank">2016 Bicycle Contest</a>.

Bicycle turn indicator

<br>The device can be built very cheap as it employs simple analogue electronics. Specifically, an astable multivibrator with two transistor-capacitor pairs generates the blinking behaviour. Plain red or orange LEDs are quite bright at night if adequately pointed towards cars behind the cyclist.<br> <iframe width="560" height="315" src="https://www.youtube.com/embed/yW1TZw_2H4U?si=dDAaQVE8ZwRN_ruL" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe> <hr> <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png"/>