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amount of wind (input) = number of LEDs Lit? Answered

Good afternoon, Im making an exhibition piece that will have children working a set of bellows that are connected to a (pretend) blacksmiths forge. What I need to represent is the more the bellows are pumped the more the "embers" will glow. Im thinking a turbine tachometer that leads to an LED driver set to display as Bar so the faster the turbine spins the more LEDS are lit, or they trigger a series of LEDs to light (this thing has to get pretty bright not sure one LED per step will do it.

Trouble is im good with the theory and pretty good with the practical its just the technical that is letting me down.

If anyone could see there way to giving this some thought and maybe doodling a circuit diagram / shopping list that would be awesome.

You can checkout some of the other things if made here imakemodels.co.uk

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steveastrouk
steveastrouk

8 years ago

You need a diode pump and a linear bar graph module, or roll your own with an LM3914 chip.

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caitlinsdad
caitlinsdad

8 years ago

Without getting complicated, and since you are using a real bellows that pushes out air... Why not just take apart a flashlight/torch and hook up the on.off switch to a potentiometer with a paddle affixed instead of a knob. Have a funnel shape pointed at the weighted paddle - to keep it in the off position - the bellows air will push it higher and make the bulb burn brighter. Good luck.