martonthenagy

Here You can find some demos and explanations: https://www.youtube.com/watch?v=A4QcyW-qTUg, https://www.youtube.com/watch?v=BaofyuCXZ_0, https://www.youtube.com/watch?v=sKa0eaKsdA0

How your dice are making consistent numbers?I'm asking this because some edges are rounded, others not, this may lead to uneven results.

Please change the inspiration video to this (because that was deleted): http://www.youtube.com/watch?v=Zi7rsuBdm5s

+1 Just for compensating the false idea of resistors.Here you _must_not_ include a resistor. Any resistor equal, or larger than 0.1 Ohm will get the most of the voltage drop, so the needles will not get any, so the power will go to the wrong place.But, You need current limiting to not burn Your house down. * When using the specified kind of phone adapters, current limiting is in the adapter. * When using 9V alkaline battery, the current limiting is in the battery, because it cannot give You too much current (based in chemistry). * When You use a powerful power supply, set up current limiting, or decrease voltage to get the ideal voltage / amperage ratio.

Great work.My personal favorite DIY induction bike light is this: https://www.instructables.com/id/Magnetic-induction-safety-bike-lights-Nearly-invis-1/

1. A basic friction magnet gives low power, especially then you want a front light. Use a rechargable battery in every case, charge it from anything you want (with an appropriate charge controller). And drive your electronics from stabilized voltage (with dc-dc boost to 5V converter).2. The Arduino cannot give large current output needed for a front light, so you must separate it: use a transistor, or other appropriate part to drive the high current LED, and not forget about current limiting.

Add the current limiting resistor! There may be the case of ideal voltage of battery and LED, but when you fully charge the battery, a LED will fully open, and slowly die from overcurrent.Add something to direct the light to front. The LED light goes almost every direction, so only few goes to front. I attach my first try, it is made from aluminium foil + double sided paper + plain paper.You may buy "led lens 20mm", it is cheap, but really adds to the cost.

Okay, now I understand. Thanks for your answer.