Passion Fruit acquire laser defenses

Apparently being overrun by ripe Passion Fruit is a problem if you live in Hawaii. [Ryan K's] solution to the situation was to use his extra fruit to power a laser. In an experiment that would make [Walter White] proud, [Ryan] gathered everyday supplies to form a battery based on the fruit.

He used some galvanized bolts as the source of zinc. It forms one pole of each cell, with a thin copper tube as the other pole. Each cell is rather weak, but when combined with others it makes a respectable battery. We’ve seen acidic fruit used to power LEDs, but [Ryan] wanted to do a little more. He built a circuit that would store electricity until he had enough potential to power an LED diode. After the break you can see a four second clip of the fruit wielding its new laser defense system.

[Thanks Jerry]

Comments

  1. NewCommentor1283 says:

    this project too needs a mad-scientist “knife switch” XD

  2. majordump says:

    Why is this on hackaday? Only difference between this and a potato powered clock is a laser diode.

    Wake me when someone does something on a much larger scale. Say a 6″ spark off a tesla coil or powers a blood thirsty AI off of a fruit/vegetable battery.

    A trusted friend in science.

  3. Hirudinea says:

    Oh, its just a fruit powered laser, I thought it was some kind of DIY GMO.

  4. Richard says:

    It is not using the fruit to power the battery. It is using the fruit to supply the electrolyte for the battery. The redox reactions at the electrodes are where the power lies, not the electrolyte.

    I’ve seen many science fair exhibits with batteries that use unconventional electrolytes, such as potatoes, lemons, seawater, etc. It’s a common mistake in the popular press to say that these are doing something like “getting energy from seawater”, or “energy from potatoes”. But the energy comes from the corrosion of the electrodes. The energy was originally put into the battery when the metal of the electrodes was refined. The expensive and energy-intensive part of a conventional battery isn’t the electrolyte, it’s the electrodes.

  5. Andrew says:

    Actually passion fruit (locally called poke) is a real problem here, the stuff keeps threatening to overrun my mango tree.

  6. JB says:

    ” He built a circuit that would store electricity until he had enough potential to power an LED diode.”

    LED diode? :P

    Light Emitting Diode diode? :P

    LE (D^2)? :P

  7. elwing says:

    it remind me aperture science “bring your daughter at work” day…

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