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The PWM value for SG90 is 500µs (0°) to 2400µs (180°). Some clones may use 544µs to 2400µs.

#include <Servo.h>
Servo myservo;  // create Servo object to control a servo
int deg;

void setup() {
  Serial.begin(9600);
  myservo.attach(D5, 500, 2400); // Custom min/max pulse widths
  deg = 0;
  myservo.write(90); // Center position
}

void loop() {
  for (int angle = 0; angle <= 180; angle += 30) {
    Serial.print("Moving to: ");
    Serial.println(angle);
    myservo.write(angle);
    delay(1000);
  }

}