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   1 // sketch_13_03_null_filter_uno
   2
   3 #include <TimerOne.h>
   4
   5 const int analogInPin = A0;
   6 const int analogOutPin = 9;
   7
   8 void setup()
   9 {
  10   Timer1.attachInterrupt(sample);
  11   Timer1.pwm(analogOutPin, 0, 100);
  12 }
  13
  14 void loop()
  15 {
  16 }
  17
  18 void sample()
  19 {
  20   int raw = analogRead(analogInPin);
  21   Timer1.setPwmDuty(analogOutPin, raw);
  22 }