참고
pwm to analog 또는 pwm to voltage 로 검색
http://ww1.microchip.com/downloads/en/AppNotes/00538c.pdf
http://www.instructables.com/id/Analog-Output-Convert-PWM-to-Voltage/
http://provideyourown.com/2011/analogwrite-convert-pwm-to-voltage/
http://blog.naver.com/todudk/220242598560
http://www.electimes.com/home/news/main/viewmain.jsp?news_uid=115810
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