Although we've already seen various illuminated turn indicators for bicycles, the fact is that cyclists should still also be using traditional hand signals. Activating an electronic indicator while also making a hand signal, however, could be a bit of a hassle. That's where the TurnCycle comes in. It uses the rider's hand signals to automatically activate a separate LED turn indicator.
Here's how the TurnCycle works ...
The user starts by powering up a wrist bracelet, and slapping it onto their left arm. When they subsequently make a left-turn signal (arm straight out), a right turn signal (arm angled up at 90-degree angle) or a stopping signal (arm angled down), a 6-axis accelerometer in the bracelet detects the movement.
Using Bluetooth, it then transmits a signal to an LED display. That device responds by displaying a series of sweeping left- or right-facing animated arrows, or simply by flashing in the case of a stopping signal. The display turns off after 25 seconds, using an audible cue to let the rider know that it's done so.
Both components are water-resistant, with the bracelet receiving power from a coin cell battery and the display running off a USB-rechargeable lithium-ion battery.
If you're interested in getting a TurnCycle system, it's currently the subject of a Kickstarter campaign. If everything works out, a pledge of US$90 will get you a one-display package, with $180 required for a kit with both front and rear displays.
The system can be seen in use, in the following video.
Sources: TurnCycle, Kickstarter