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Blinking Bicycle LED Light using 555 w/ case

Picture of Blinking Bicycle LED Light using 555 w/ case
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This is a project developed during our "Taller de Inventos" (AKA August Build Night), sponsored by Instructables and Jameco, that provided some of the components for this instructable.

It's a LED light originally conceived as an accesory for cyclists, but it could be used for any purpose. The frequency at which it blinks depends on the resistors and capacitors used. It can be calculated using this calculator for 555 Astable Circuits.

In the end we settled with the following values that set the frequency to 1.215 Hz or roughly 823ms.

Resistors
R1= 100 ohm
R2= 100 kohm
R3 and R4= 220 ohm

Capacitors
C1= 2.2 µF
C2= 10 nF

Other materials
1 Wazzabi LED Light PCB (PDF available)
6 Red LEDs
1 555 Timer Integrated Circuit
1 On/off switch
1 9v Battery
1 9v Battery connector
2 short cables (5cm each)

Case
This part is up to your imagination. We used a transparent paper clip case that fit perfectly but a hand lotion jar could work too.

Velcro tape (20 cm)
Box
Contact adhesive

Tools
Dremel Drill
Soldering iron
Nail or metalic piece for heating and perforating plastic

DISCLAIMER
During this instructable you'll see a 4,7 kohm resistor instead of the 100 kohm we finally settled with. This was a change we did at the last moment and we couldn't reshoot the photos. Just take the 4.7 kohm resistor as if it was a 100 kohm one.

Video
Watch the light blink over here
 
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Step 1: Printing the PCB

Picture of Printing the PCB
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The first step of this instructable is printing the PCB. You'll find attached the necessary PDFs.

Since this task excedes our instructable, feel free to follow these instructables instead:
- How to make the PCB board (available in Spanish)
- PCB making guide
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