In the past few months, we have covered plenty of turn signal gloves. You can always build your own with the Circuit Playground and learn a thing or two about electronics in the process. You are going to need a battery and bike gloves to complete the Circuit Playground Bike Glove project.
Carter Nelson’s guide shows you how to sew the Circuit Playground to your bike glove and use the accelerometer to detect hand position. More info is available here.