Pulse on off, to change resistance in circuit

[yipyap777]

Hi, im a noob.. so here goes.
I going to put a reed switch near a bike wheel. A magnet on the spoke, as every time the wheel goes around it will make the switch turn on and off.
What I want is to make a circuit with Arduino board.
I want to change resistance in a circuit according to how fast the reed switch turns on and off.


Hope this makes sense..

Thanks for any help.

Cheers

 

[ChrisP58]

Don't use resistance. Use PWM to control the brightness.

Increase the duty cycle when the input pulse timing is shorter. Decrease it when they get longer.

 

[yipyap777]

Thanks, but I just used the light as an example. I not using it for a light, but i really do need to change the resistance. Like a variable trim pot.

I wish to change the pitch of audio with variable resistance - changed by the speed of the wheel.

 

[ChrisP58]

Thanks, but I just used the light as an example. I not using it for a light, but i really do need to change the resistance. Like a variable trim pot.

I wish to change the pitch of audio with variable resistance - changed by the speed of the wheel.

Then you should use a digital potentiometer. Lots of them out there.

www.maxim-ic.com
www.analog.com
www.microchip.com
www.ti.com

 

[yipyap777]

Thanks that's put me on the right track didn't know they existed.