A bicycle rear warning sign with distance sensor #Feather #FeatherFriday @Hackaday.io @Adafruit

Tegwyn☠Twmffat posts on Hackaday.io a bike rear sign project.

Since taking on a part-time job as a bicycle courier delivering parcels for Hermes Parcelnet, UK, I realized that rear facing lighting was really important to ensure safety on the road. I started using regular LED cycle lamps, which were pretty good, but decided to take this 10 steps further and build a massive illuminated sign.

An ultrasonic sensor detects cars behind the bike with the help of an Adafruit Feather (M4 Express). All those LEDs are controlled by a pair of L293 motor driver chips and a slide potentiometer for some dimming action. After all, they need to get enough juice to be visible in broad daylight, but also be dimmable so as not to blind people at night.

See the video below and details on Hackaday.io and the corresponding Hackaday article.


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