No idea how to make this LED Windmill

OK, I have an idea that sounds kind cool but no working knowledge of electronics. How difficult would it be to make a bank of wind powered LEDS? A circut that progressively lights up more leds as the wind kicks up to a higher speed?

LasVegas10 years ago
What would be cool is to place the LEDs along the blades of the windmill so the pattern changes as the wind increases and decreases.
VIRON10 years ago
I can't draw this now but maybe later... simple! In series with one LED put a diode and resistor The next led has 2 diodes and a resistor The next one has 3 diodes and a resistor and so on. Make sure LED and diodes are right polarity. (Each diode drops around half a volt from the LED) For a 6 volt motor (generator) maybe use 47 or 470 ohm resistors. Belt or gear the motor to the windmill if necessary, wind has plenty of power for this! A very simple LED bar graph volt meter, no chips. (Also see my iBle "magnet powered light" for different generator option)
HamO10 years ago
Maybe one of these circuits might work for you:

They are from a Google search of "led voltmeter circuit
NachoMahma10 years ago
. Should be pretty easy. Someone (probably more than one) makes a chip to drive LED VU meters. I _think_ you will want one with a linear curve, but not sure. Get one and tap the V output of the mill (have to use a dropping resistor if you want to use current as the variable) as the signal for the chip - may need to adjust the voltage (divider) before sending it to the chip. I made a VU meter many years ago - it was easy, but I don't remember the details.