An Electronic, Battery-less Dice

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Introduction: An Electronic, Battery-less Dice

Update: A complete Instructable for this is here: Faraday For Fun: An Electronic Batteryless Dice

A Microcontroller, AVR Tiny13 based electronic dice, that does not use any battery or any normal power source. Instead it derives its power from a voltage generator based on the Faraday principle using a coil wound over a tube and a magnet inside the tube. To use the dice, just shake the circuit a few times and it produces a random number between 1 and 6 and displays it on the LEDs. Background music: Por Una Cabeza by Carlos Gardel

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    34 Discussions

    0
    zanfr
    zanfr

    12 years ago on Introduction

    you could lose the diodes and use a smaller "goldcap"

    0
    Gadre
    Gadre

    Reply 12 years ago on Introduction

    Diodes are necessary to convert the alternating voltage being produced by the Faraday generator into DC voltage to power the circuit. The current implementation doesnt use a Goldcap, but a normal electrolytic capacitor, 4700uF. Using a goldcap, even a smaller value goldcap, would require too much shaking to charge up the capacitor.

    You can see all the details of this in the new Instructable I posted:
    Faraday For Fun: An Electronic Batteryless Dice

    0
    zanfr
    zanfr

    Reply 12 years ago on Introduction

    use a denser coil and neodymium magnet also i always thought caps could smooth AC to DC (hence their ample use in power supply filtering) anyways i have used caps before on a nixie PSU i made to do just that; of course it was full DC some AC remained but if it saves you components; especially since u unload DC cap into the LEDs it doesnt matter i think...

    0
    static
    static

    Reply 9 years ago on Introduction

    Yes inductors can be used to acquire power supply filtering than capacitors alone. The ting to keep in mind is that a coil design that make a good filter, may not make a coil that works well for power generation, and vise versa. At this low power of power production using an inductor could sap away too much power, beside extreme filtering isn't needed here. BTW; neodymium magnets are used in this project .

    0
    kenny789
    kenny789

    12 years ago on Introduction

    ohh now i understand you shake it and that charges the cap and thats what powers it. very nice but wont that make ac current not dc?

    0
    static
    static

    Reply 9 years ago on Introduction

    Most if not all mechanical means of creating electrical current first produce AC. Than that AC is the turned into DC. In some generators by the mechanical switching provided by an commutator, and brushes that act as a high speed mechanical switch. In other generators rectifiers are used. As Gadre stated solid state rectifier are used with this generator

    0
    kcbford1
    kcbford1

    Reply 12 years ago on Introduction

    it makes AC current but, you use 4 diodes in the circuit to regulate the alternating currents.

    0
    Myself
    Myself

    12 years ago on Introduction

    That was a nice demonstratable, but isn't it supposed to be an instructable?

    0
    Myself
    Myself

    Reply 12 years ago on Introduction

    Oops, mea culpa: I didn't realize that videos and slideshows [https://www.instructables.com/id/The-InstructableSlideshowVideo-Tabs..../ aren't intended to be instructables] and should not be construed as such. (Replying to my own post so others can be similarly educated.)

    0
    Eirinn
    Eirinn

    Reply 11 years ago on Introduction

    I didn't know either and i thank you for posting that re-reply

    0
    zaphodikus
    zaphodikus

    11 years ago on Introduction

    I read your "Programming and Customizing the AVR micro" - nice project.

    0
    trekman
    trekman

    12 years ago on Introduction

    I found the video. I saved this as a favorite and then looked it up and clicked on it and when it loaded it showed the video link. So now I just need help to build one. Nice show and tell but no info to build one. Why did you put it on Instructables if all you wanted was to show it off? I really hope you add the missing info to it.

    0
    trekman
    trekman

    12 years ago on Introduction

    To anyone: I use Internet Explorer but do not see any video link. I just see a box titled "enbed code" and the box with the email, print, favorite and flag links in it with all the comments listed under the box. This sounds like a simple project but I am a beginner. I do not know what an AVR Tiny 13 base is. I would like to see a schematic and this video (where ever it is). I hope you will help me and all the others who want more info. Thanks for anything.

    0
    unitedelectric

    Great project. Question on the linear alternator: are you doing a full-wave rectifier to produce dc? Also, there is no such thing as a "radially magnetized" neo magnet. How are you getting the magnetic flux to travel through the coil perpendicularly? Binding the magnets south-to-south and north-to-north with iron spacers would concentrate the flux radially (doable, but tough) this is a fundamental weekness in all shake designs I've seen. Thanks for the vid though.

    0
    dhoncave
    dhoncave

    12 years ago on Introduction

    could it be hack?to the owners advantage? i still trust the traditional dice

    0
    iKill
    iKill

    12 years ago on Introduction

    very, Very VERY cool im might build it if i can get everything from my local radioshack, do they sell neodymium magnets and leds there?

    0
    Gadre
    Gadre

    Reply 12 years ago on Introduction

    You can get neodymium magnets from www.amazingmagnets.com. Leds from Radioshack, yeah sure.