Whats even harder is attempting to warn drivers when you are going to turn. You could throw your hand out, but this can make you loose stability and most people don't remember the ways to put your hands. This instructable seeks to make warning drivers and other cyclists that much more easier, and make your more visible while doing it especially at night.
Alas this is the premise for the Bicycle Turn Indicators, another pal in the "Make Your Bike Into A Car Series"
Step 1: The Flashing Circuit
A note about flashing circuit relays for cars, There are two kinds electrical and mechanic. Make sure you pick up an Electrical one, i made this mistake, and got the right one off ebay. Below are some pictures.
Step 2: Choosing Battery
A few D (8000mAh) NiMh batteries equaling 12v (Slightly Expensive but will last quite a while)
12v Lead Acid (Heavy as hell, really cheap)
2 Lantern Batteries at 6v each (Not Rechargeable, boo)
for this project's longevity, go with a rechargeable option. If you have a lot of amps you could also run a car horn or a small sound system.
Step 3: Supply List
1 LED flasher (Electrical NOT Mechanical)
1 12v battery (Choose Wisely)
20 Yellow 10mm LEDs (yellow is the standard on cars, you could use anything but blue, blue is illegal on vehicles)
4 82 OHM resistors (Based on the calculator here http://led.linear1.org/led.wiz)
A way to Case it (i'm using Beta cases due to their flatness)
Connectors to allow the cases to be removed from the bike (i'm using auto cables)
Step 4: Test Circuit #1
Step 5: Test Circuit #2
Step 6: Creating the Blinker Cases Step 1
Step 7: Creating The Blinker Case Part 2
After that, check the leds and see if they fit, if they don't drill out the hole a bit more, I made my holes just small enough for the leads but not the whole bulb.
Step 8: Creating The Blinker Cases Part 3
Last use a connector and solder that on so you can plug it in with the rest of the system. Use hot glue to make it all stay put.
Repeat 3 times.
Step 9: The Switch
I dremeled out a plastic case and attached zip ties so it can be attached to the handlebars.
Step 10: The Relay Case + Batteries
The Batteries on the other hand are a bit to big to go in this case so they are getting strapped the bike with zip ties
Step 11: Installation
The first step it too attach the light cases, i drilled holes about the size of the fork and down tubes and attached them with zip ties.
next attach the switch and solder 3 wires to the switch which will control the direction of the turn indicators.
Lastly solder it all together, remembering which size goes to which switch, i used a little piece of tape to remind me.
After all the wires are soldered, do a battery check to see if everything works, if not check your connections. Once that is done you can attach the batteries and hook that up with the rest of the system.
This step takes about 2 hours. Be prepared and it also makes your bike unoperational for that period.
Step 12: Test ride!!!!!!
I was really impressed with the brightness level and it seemed to help maneuvering around automobiles.
The first problem i encountered was that i hit the back light fixture with my foot, Also the general size of the light fixtures are a bit big, a smaller container could be used.
The zip ties also proved to not to have a good enough grip from preventing the light box from moving from side to side, this could be fixed by using hose clamps, which i will get in the next few days.
Putting in a way for both lights to be flashed at the same time would improve this project thus allowing for a "warning light"
Here is video for the final product: