My arduino printing garbage

i'm using a lolin(wemos) d1 r2 mini

here is the code

#include <Ultrasonic.h>

#set TRIGGER_PIN 6
#set ECHO_PIN 7

Ultrasonic ultrasonic(TRIGGER_PIN, ECHO_PIN);

void setup() {
Serial.begin(9600);
Serial.println("Reading sensor data...");
}

void loop() {
long microsec = ultrasonic.timing();
float distanceCentimeters = ultrasonic.convert(microsec, Ultrasonic::CM);
Serial.print("Distance in cm: ");
Serial.println(distanceCentimeters);
delay(1000);
}

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