GY-271 Compass (QMC5883L) with an Arduino Uno

// GY-271 Compass (QMC5883L) on Arduino Uno: wiring and a free simulation at https://www.tinkered.ai/components/gy-271/arduino-uno
// lib_deps = mprograms/QMC5883LCompass
#include <QMC5883LCompass.h>

QMC5883LCompass compass;

const char* const POINTS[16] = {"N", "NNE", "NE", "ENE", "E", "ESE", "SE", "SSE", "S", "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW"};

void setup() {
  Serial.begin(9600);
  compass.init();            // Wire.begin(), then continuous 200 Hz, ±8 G
  Serial.println("Compass ready");
}

void loop() {
  compass.read();
  int x = compass.getX();
  int y = compass.getY();
  int z = compass.getZ();

  int heading = compass.getAzimuth();   // -180..179
  if (heading < 0) heading += 360;      // 0..359, clockwise from magnetic north

  // the 16-point name: 22.5° each, N centred on 0
  const char* point = POINTS[(int)((heading + 11.25) / 22.5) % 16];

  Serial.print("heading ");
  Serial.print(heading);
  Serial.print(" ");
  Serial.print(point);
  Serial.print("  x ");
  Serial.print(x);
  Serial.print(" y ");
  Serial.print(y);
  Serial.print(" z ");
  Serial.println(z);
  delay(250);
}