 const int kFan0PwmPin = 3;
 const int kFan1PwmPin = 9;
 const int kFan2PwmPin = 10;
+const int kFan3PwmPin = 11;
 
 const int kFan0RpmPin = 4;
 const int kFan1RpmPin = 6;
 const int kFan2RpmPin = 7;
+const int kFan3RpmPin = 8;
 
 void setup() {
   Serial.begin(19200);

  Serial.print(",");
  Serial.print(rpm2);
  Serial.print(",");
  Serial.print(fan_0_dutycycle);
  Serial.print(",");
  Serial.print(fan_1_dutycycle);
  Serial.print(",");
  Serial.println(fan_2_dutycycle);

  if (ReadSerial(command, kCommandLength)) {
    switch (command[0]) {

  analogWrite(kFan0PwmPin, map(fan_0_dutycycle,0,100,0,255));
  analogWrite(kFan1PwmPin, map(fan_1_dutycycle,0,100,0,255));
  analogWrite(kFan2PwmPin, map(fan_2_dutycycle,0,100,0,255));
  analogWrite(kFan3PwmPin, map(fan_3_dutycycle,0,100,0,255));

  delay(200);
}
