void setup() {
 pinMode(5, OUTPUT);
 Serial.begin(9600);
 Serial.println("PWM TEST");
 delay(3000);

}

void loop() {
analogWrite(5,200);
float v = (200/255.0)*4.64;
Serial.print("Voltage = ");
Serial.println(v);
Serial.println("[V]");
delay(1000);
}