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Can you elaborate on what you actually mean? Are those "bike turn signals" you need for some special purpose? Graphics, photos, video, therapy, sports, ...?
 
Here you go! :)
 

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I saw a dude in a wheelchair at school, and when he turned a corner i told him he forgot to use his turn signal. Luckily he had a good sense of humor. :D
 
why don't you just use your hand to signal when your turning it seams such a waste to put an actual turn signal your bike...
 
If you really want to do this, you'll need a relay for a turn signal, or maybe an arduino programmed to power on and off a light with a steady pattern. Some LEDs or whatever and a switch that has two different on positions and an off position, then a source of power.

Or, maybe you could find motorcycle turn signals, motorcycle turn signal switch and everything else involved. Maybe look for an older model bike which had carbs rather than fuel injection, as it should just be a 'simple' circuit rather than a computer.

Lot of trouble for nothing really. Other road users won't pay attention to your turn signals either.
 
If you really want to do this, you'll need a relay for a turn signal, or maybe an arduino programmed to power on and off a light with a steady pattern. Some LEDs or whatever and a switch that has two different on positions and an off position, then a source of power.

You can buy "blinking" LEDs which have the blink circuitry built into the LED housing or on a small circuit board. No microcontroller needed. I scavenged one off a box from a Logitech (I think?) optical mouse back when optical sensors were the new thing to replace a mechanical mouse ball. You could also scavenge from one of those fake security cameras (in which pretty much the ONLY actual circuitry is a blinking LED).

Just add a battery and either an SPDT toggle (momentary-return ideally) or two separate pushbuttons, and you're good.
 
its pretty simple, Just point left with your left hand if you're going to turn left, point right with your right hand if you're going to turn turn, and if you're stopping just putting your left palm backwards and do a bit it downward wave to drawn attention to the fact that you're slowing to a stop.

The left arm up at a ninety degree bend was designed for cars back in the day before signals because in a car, pointing with your right arm to go right wouldn't be visible. It also applied to motorcycles, snowmobiles and atv's that don't have signals because you need your right hand for the throttle.
 
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