Shiny motorcycle computer

We’re rather surprised at how popular it has become to build your own motorcycle computer. [Mario Mauerer] tipped us off about his shiny motorcycle computer (translated) for his Yamaha XTZ 750. It uses an ATmega644 microcontroller to pull a variety of data together and display it on this white LED backlit display. He connected a flow meter to the fuel line to monitor gas consumption. Oil temperature is captured by inserting a brass tube (containing the sensor) through a hole in the oil cap and soldering it in place. Water temperature is gathered by measuring the external temperature of one of the cooling lines. [Mario] uses a rotary encode with a click function as the control interface device, and a battery backed real time clock keeps time.

A quick look at the PCBs tells the tale of good circuit design. But we do wonder about catching the reflection of the sun in that shiny bezel.

Computer aided cake decoration

This contraption lets you decorate your cake at the push of a button. It’s a stretch to call it computer aided as this is purely a mechanical monster, but we still enjoy the apparatus and see its CNC potential (we’re still waiting for that pizza printer to hit the market too). An icing syringe has been modified with a flexible hose on the business end. As constant pressure is applied to the plunger, the nozzle oscillates while the cake rotates. What results is a spirograph drawing on the top of your dessert. But the fun doesn’t stop there. Another push of the button and you get shiny silver orb candies joining in the party.

What, no video? Aw! If you know where to find a clip, let us know and we’ll update this post.

[Thanks Mowcius]

Brightest day, darkest night, charge it with Arduino’s light

To userp the Green Lantern oath is a sacrilege. But calm your rage as you take in this Green Lantern battery and ring project. [Jon] built the power battery portion out of LEGO, but inside you’ll find an added bonus. An Arduino uses a set of LEDs and an RFID reader to bring the object alive. A matching ring contains the RFID tag that activates the lights when held up to the lantern’s lens. You can see this used to charge the power ring (and join in by saying the oath) in the video after the break.

Want to build something like this but don’t have an RFID reader? This would be easy to pull off by adding a magnet to the ring and a hall effect sensor in the lantern. Maybe this will make you rethink your Halloween costume this year.

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The polyplasmic archophone

The polyplasmic archophone is a fresh approach to high voltage “arc music“. They are using  an Arduino clone to convert signals for the ignition coils. It is still unfinished, but the effect is decent. In the end it will have 2 tiers of voice coils for a total of 13. They are using different materials for the antenna so they can get different colors of sparks. You can see a video of it after the break and we must say the effect is quite nice. Change the lighting on that video and we could imagine this being the set to a [Joules Verne] movie.

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