Add Adafruit Unified Sensor API example

- Add bmp5xx_unified_sensor example demonstrating unified sensor interface
- Show detailed sensor metadata (range, resolution, type, ID)
- Demonstrate event-based readings with timestamps
- Use alternative I2C address (0x47) for consistency
- Include altitude calculation from pressure readings
- 2-second reading intervals with structured output

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/bmp5xx_unified_sensor/bmp5xx_unified_sensor.ino

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+/*!
+ * @file bmp5xx_unified_sensor.ino
+ *
+ * This is an example for the BMP5xx pressure and temperature sensor using
+ * the Adafruit Unified Sensor API. This approach allows for easy integration
+ * with other Adafruit sensor libraries and provides standardized sensor events.
+ * 
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Limor "ladyada" Fried for Adafruit Industries.
+ * BSD license, all text above must be included in any redistribution
+ */
+
+#include <Wire.h>
+#include <Adafruit_Sensor.h>
+#include "Adafruit_BMP5xx.h"
+
+Adafruit_BMP5xx bmp; // Create BMP5xx object
+
+// Get separate sensor objects for temperature and pressure
+Adafruit_Sensor *bmp_temp = NULL;
+Adafruit_Sensor *bmp_pressure = NULL;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);  // Wait for Serial Monitor to open
+  
+  Serial.println(F("Adafruit BMP5xx Unified Sensor API Example"));
+  Serial.println();
+
+  // Try to initialize the sensor using I2C with alternative address
+  if (!bmp.begin(BMP5XX_ALTERNATIVE_ADDRESS, &Wire)) {
+    Serial.println(F("Could not find a valid BMP5xx sensor, check wiring!"));
+    while (1) delay(10);
+  }
+
+  Serial.println(F("BMP5xx found!"));
+
+  // Get the unified sensor objects
+  bmp_temp = bmp.getTemperatureSensor();
+  bmp_pressure = bmp.getPressureSensor();
+
+  // Print sensor details using the unified sensor API
+  Serial.println(F("=== Temperature Sensor Details ==="));
+  sensor_t temp_sensor;
+  bmp_temp->getSensor(&temp_sensor);
+  Serial.print(F("Sensor Name: ")); Serial.println(temp_sensor.name);
+  Serial.print(F("Sensor Type: ")); Serial.println(temp_sensor.type);
+  Serial.print(F("Driver Ver:  ")); Serial.println(temp_sensor.version);
+  Serial.print(F("Unique ID:   ")); Serial.println(temp_sensor.sensor_id);
+  Serial.print(F("Min Value:   ")); Serial.print(temp_sensor.min_value); Serial.println(F(" °C"));
+  Serial.print(F("Max Value:   ")); Serial.print(temp_sensor.max_value); Serial.println(F(" °C"));
+  Serial.print(F("Resolution:  ")); Serial.print(temp_sensor.resolution); Serial.println(F(" °C"));
+  Serial.println();
+
+  Serial.println(F("=== Pressure Sensor Details ==="));
+  sensor_t pressure_sensor;
+  bmp_pressure->getSensor(&pressure_sensor);
+  Serial.print(F("Sensor Name: ")); Serial.println(pressure_sensor.name);
+  Serial.print(F("Sensor Type: ")); Serial.println(pressure_sensor.type);
+  Serial.print(F("Driver Ver:  ")); Serial.println(pressure_sensor.version);
+  Serial.print(F("Unique ID:   ")); Serial.println(pressure_sensor.sensor_id);
+  Serial.print(F("Min Value:   ")); Serial.print(pressure_sensor.min_value); Serial.println(F(" hPa"));
+  Serial.print(F("Max Value:   ")); Serial.print(pressure_sensor.max_value); Serial.println(F(" hPa"));
+  Serial.print(F("Resolution:  ")); Serial.print(pressure_sensor.resolution); Serial.println(F(" hPa"));
+  Serial.println();
+
+  // Configure sensor for optimal performance
+  bmp.setTemperatureOversampling(BMP5XX_OVERSAMPLING_2X);
+  bmp.setPressureOversampling(BMP5XX_OVERSAMPLING_16X);
+  bmp.setIIRFilterCoeff(BMP5XX_IIR_FILTER_COEFF_3);
+  bmp.setOutputDataRate(BMP5XX_ODR_50_HZ);
+  bmp.setPowerMode(BMP5XX_POWERMODE_NORMAL);
+
+  Serial.println(F("=== Starting Unified Sensor Readings ==="));
+  Serial.println();
+}
+
+void loop() {
+  // Create sensor event structures
+  sensors_event_t temp_event, pressure_event;
+
+  // Get temperature event using unified sensor API
+  if (bmp_temp->getEvent(&temp_event)) {
+    Serial.print(F("Temperature: "));
+    Serial.print(temp_event.temperature);
+    Serial.print(F(" °C"));
+    
+    // Print additional event details
+    Serial.print(F(" [Timestamp: "));
+    Serial.print(temp_event.timestamp);
+    Serial.print(F(" ms, Sensor ID: "));
+    Serial.print(temp_event.sensor_id);
+    Serial.println(F("]"));
+  } else {
+    Serial.println(F("Failed to get temperature event"));
+  }
+
+  // Get pressure event using unified sensor API
+  if (bmp_pressure->getEvent(&pressure_event)) {
+    Serial.print(F("Pressure:    "));
+    Serial.print(pressure_event.pressure);
+    Serial.print(F(" hPa"));
+    
+    // Print additional event details
+    Serial.print(F(" [Timestamp: "));
+    Serial.print(pressure_event.timestamp);
+    Serial.print(F(" ms, Sensor ID: "));
+    Serial.print(pressure_event.sensor_id);
+    Serial.println(F("]"));
+
+    // Calculate and display altitude using pressure
+    float altitude = 44330.0 * (1.0 - pow(pressure_event.pressure / 1013.25, 0.1903));
+    Serial.print(F("Altitude:    "));
+    Serial.print(altitude);
+    Serial.println(F(" m"));
+  } else {
+    Serial.println(F("Failed to get pressure event"));
+  }
+
+  Serial.println(F("---"));
+  delay(2000); // Read every 2 seconds
+}