Introduction to Pulse Width Modulation (PWM) -=20
http://www.netrino.com/Publications/Glossary/PWM.html

Cheers
/Ake

John J. McDonough wrote:

>Think of a capacitor as an integrator.  Pretty simple to get from that a=
nd a
>PWM output to a variable voltage.
>
>--McD
>
>----- Original Message -----=20
>From: "rumpelteazer666" <rumpelteazer666@gmail.com>
>To: <piclist@mit.edu>
>Sent: Tuesday, April 26, 2005 3:52 PM
>Subject: pwm?
>
>
> =20
>
>>every pic tutorial has a lesson about using pwm to vary the intensity o=
f a
>>led, but i couldn't find something that explained how it works in theor=
y.
>>Recently someone has posted a message suggesting to use pwm to get an
>>   =20
>>
>analog
> =20
>
>>voltage. How does that work? Let's say i send a square wave to
>>   =20
>>
>resistor-led,
> =20
>
>>does the intensity of light depend on the duty cycle of the wave? And i=
f
>>yes, is it just for an optical effect, or there is some electrical law
>>behind it? in the latter case, what would be a general method to obtain=
 an
>>analog voltage through it? i know they are very stupid questions, sorry
>>   =20
>>
>for
> =20
>
>>that and thank you in advance for any enlightening answer :)
>>--=20
>>http://www.piclist.com PIC/SX FAQ & list archive
>>View/change your membership options at
>>http://mailman.mit.edu/mailman/listinfo/piclist
>>
>>   =20
>>
>
>
> =20
>


--=20
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se     =20
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org


--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist