Brake Light Blinker Does It with Three Fives

Sometimes you use a Raspberry Pi when you really could have gotten by with an Arudino. Sometimes you use an Arduino when maybe an ATtiny45 would have been better. And sometimes, like [Bill]’s motorcycle tail light project, you use exactly the right tool for the job: a 555 timer.

One of the keys of motorcycle safety is visibility. People are often looking for other cars and often “miss” seeing motorcyclists for this reason. Headlight and tail light modulators (circuits that flash your lights continuously) are popular for this reason. Bill decided to roll out his own rather than buy a pre-made tail light flasher so he grabbed a trusty 555 timer and started soldering. His circuit flashes the tail light a specific number of times and then leaves it on (as long as one of the brake levers is depressed) which will definitely help alert other drivers to his presence.

[Bill] mentions that he likes the 555 timer because it’s simple and bulletproof, which is exactly what you’d need on something that will be attached to a motorcycle a be responsible for alerting drivers before they slam into you from behind.

We’d tend to agree with this assessment of the 555; we’ve featured entire 555 circuit contests before. His project also has all of the tools you’ll need to build your own, including the files to have your own PCB made. If you’d like inspiration for ways to improve motorcycle safety in other ways, though, we can suggest a pretty good starting point as well.

Making wheelchairs more safe through high visibility


When traveling around the city or even rural areas in a wheelchair, we imagine it can be pretty easy to get overlooked. [Rui] was asked to add some lights and sounds to an electric wheelchair in order to ensure that its rider remained visible to those around him.

The system uses several different components to ensure that the driver can be seen. The first is a message board strapped to the back of the chair which was constructed from a pre-made 8×32 LED matrix enclosed in an acrylic project box. The board uses a PIC16F88 to store and display messages, which are triggered by a control board mounted near the chair’s joystick. He also added headlights and taillights, using bright white and red LEDs, respectively. A 107dB horn was mounted on the chair to ensure that if the driver is not seen, he will certainly be heard.

Everything looks like it fits nicely, without hindering the operation or looks of the chair. Check out the video below to see his high-visibility system in action.

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