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In this project I will show you how I modded the lighting system of an old Moped (Simson S50). The old bulbs and flasher relay are just inefficient and not reliable. I added LEDs to the turn signals and brake light. Everything is controlled by the awesome Attiny85. As a bonus I also included under body lights in the circuit. Let's build it!

Step 1: Watch the Video!

This video gives you a basic idea how I changed the lighting system of the moped. But since it is kind of complex I will go through the most important steps again.

Step 2: Order Your Parts!

Here I present the parts that I used. Of course you can change the number of used LEDs, but that would mean you need to look for other resistors. Just use this list as a recommendation by me:

58xRGB LEDs (common Anode): http://amzn.to/1D0DSYS

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

32xOrange LEDs: http://amzn.to/1kTtWvF

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

8xWhite LEDs: http://amzn.to/1re3V8c

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x10kΩ, 2x1kΩ, 1x56Ω: http://amzn.to/1A2KZzi

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xLM7805 (5V linear regulator): http://amzn.to/1qKUGAC

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x10µF Capacitor: http://amzn.to/1tZRcrz

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xArduino Uno (as programmer for Attiny85): http://amzn.to/1tZNXjZ

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xAttiny85: http://amzn.to/1qKReWK

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xIC Socket: http://amzn.to/1tZPcQ0

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xPCB (striped, we used one of those for the big resistors) : http://amzn.to/1qKV2Hy

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xPCB (copper dots, for the controller board): http://amzn.to/1r3pjRX

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xBC140 NPN Transistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x12Ω 5W: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x19Ω 1W: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x8Ω 5W: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

4x5.6Ω 5W:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x47Ω 1W: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Wire: http://amzn.to/1sWaqiy

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Silvered Copper Wire (Bridge Wire): http://amzn.to/1cjeHaH

http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Solder: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

http://amzn.to/NJ63Hk

That is quite a long list. But it will be worth it in the end!

Step 3: Build the Turn Signals and Brake Light!

We used veroboards with stripped copper traces for the turn signals and brake light, because it is easier to connect parts in parallel this way. We used a dremel and rasps to give them a custom size. This way they will fit perfectly in their cases later. You can decide how many LEDs you want on each turn signal and brake light. We chose this constellation:

Turn Signals (4 of those):

4xorange LEDs (front and back)

2xwhite LEDs (only front)

1x RGB LED (front and back)

Brake light(only 1):

18 RGB LEDs

All of the anodes must be connected in parallel. And the cathode of each color. At the end you need to solder wires to each cathode and the common anode.

Step 4: Build the Controller Board With the Attiny85!

Here you can find the schematic of the whole lighting system. This includes the circuit for the Attiny85. It is a pretty simple one with a 5V voltage regulator (LM7805) and a few pull down and one pull up resistor. I used a veroboard with copper dots for this one, because I was able to build the circuit really small.

Step 5: Upload the Code to the Attiny85!

Here you can find the code for the Attiny85. I like to use an Arduino Uno as a programmer. If you don't know how this work then take a look at my other video:

Step 6: Mount All the Parts on Your Moped and Wire Everything Up!

The title says it all. You can put your switches wherever you want and don't have to use the same technique that we use. Just follow the schematic and everything will work out in the end.....hopefully!

Step 7: Success!

You made it. You just modded your own Moped. Whether this is street legal is another question, but still pretty awesome!
Feel free to check out my Youtube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information.

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

Great job. Greeds from Germany.
<p>He is also from Germany :D</p>
<p>Nice, I bet it helps one feel safe while riding at night. Thanks for sharing!</p>
<p>Sweet upgrade. I like the melding of old and new. Very neat looking circuit construction.</p>

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