int sE1 = analogWrite(14);
int sE2 = analogWrite(15);
int sM1 = analogWrite(16);
int sM2 = analogWrite(17);
int sD1 = analogWrite(18);
int sD2 = analogWrite(19);
Read up on analogWrite(). It takes 2 arguments, the pin to be used and the value to be written to the pin. It does not return a value