Comments: Qwiic Ultrasonic Distance Sensor (HC-SR04) Hookup Guide

The sample code is nice, but something that didn't require the SSD1306 display would be more basic. It might help a beginner get started without having to strip out the code for the components which they did not purchase.

#include <Wire.h>
#define RESPONDER_BROADCAST_ADDR 0x00  //default address
#define RESPONDER_ADDR 0x00       //RESPONDER_ADDR 0xA0-0xAF
uint8_t distance_H = 0;
uint8_t distance_L = 0;
uint16_t distance = 0;

void setup() {
  Wire.begin(); // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}
void loop() {
  Wire.beginTransmission(RESPONDER_ADDR); // transmit to device #8
  Wire.write(1);              // measure command: 0x01
  Wire.endTransmission();    // stop transmitting

  Wire.requestFrom(RESPONDER_ADDR, 2);    // request 6 bytes from RESPONDER device #8
  while (Wire.available()) { // RESPONDER may send less than requested
    distance_H = Wire.read(); // receive a byte as character
    distance_L = Wire.read();
    distance = (uint16_t)distance_H << 8;
    distance = distance | distance_L;
    Serial.print(distance);         // print the character
    Serial.println("mm");
    delay(1);

    delay(100);
  }
}