Initial library implementation for STHS34PF80 infrared sensor

- Add basic library structure with header and implementation files
- Implement constructor, destructor, and begin() method
- Add register definitions with doxygen comments
- Include WHO_AM_I chip identification verification
- Add basic test example sketch
- Verified working on hardware with I2C address 0x5A

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

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

Adafruit_STHS34PF80.cpp

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+/*!
+ * @file Adafruit_STHS34PF80.cpp
+ *
+ * @mainpage Adafruit STHS34PF80 infrared sensor library
+ *
+ * @section intro_sec Introduction
+ *
+ * This is a library for the STHS34PF80 infrared sensor
+ *
+ * Designed specifically to work with the Adafruit STHS34PF80 breakout:
+ *   http://www.adafruit.com/products/
+ *
+ * These sensors use I2C to communicate, 2 pins are required to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * @section author Author
+ *
+ * Written by Ladyada for Adafruit Industries.
+ *
+ * @section license License
+ *
+ * MIT license, all text here must be included in any redistribution
+ *
+ */
+
+#include "Adafruit_STHS34PF80.h"
+
+/*!
+ * @brief Instantiates a new STHS34PF80 class
+ */
+Adafruit_STHS34PF80::Adafruit_STHS34PF80() {}
+
+/*!
+ * @brief Cleans up the STHS34PF80
+ */
+Adafruit_STHS34PF80::~Adafruit_STHS34PF80() {
+  if (i2c_dev) {
+    delete i2c_dev;
+  }
+}
+
+/*!
+ * @brief Initializes the hardware and detects a valid STHS34PF80
+ * @param i2c_addr I2C address to use
+ * @param wire The Wire object to be used for I2C connections
+ * @return True if initialization was successful, otherwise false
+ */
+bool Adafruit_STHS34PF80::begin(uint8_t i2c_addr, TwoWire *wire) {
+  if (i2c_dev) {
+    delete i2c_dev;
+  }
+
+  i2c_dev = new Adafruit_I2CDevice(i2c_addr, wire);
+
+  if (!i2c_dev->begin()) {
+    return false;
+  }
+
+  Adafruit_BusIO_Register chip_id = Adafruit_BusIO_Register(
+      i2c_dev, STHS34PF80_REG_WHO_AM_I, 1);
+
+  if (chip_id.read() != 0xD3) {
+    return false;
+  }
+
+  return true;
+}

Adafruit_STHS34PF80.h

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+/*!
+ * @file Adafruit_STHS34PF80.h
+ *
+ * This is a library for the STHS34PF80 infrared sensor
+ *
+ * Designed specifically to work with the Adafruit STHS34PF80 breakout:
+ *   http://www.adafruit.com/products/
+ *
+ * These sensors use I2C to communicate, 2 pins are required to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Ladyada for Adafruit Industries.
+ *
+ * MIT license, all text here must be included in any redistribution.
+ *
+ */
+
+#ifndef __ADAFRUIT_STHS34PF80_H__
+#define __ADAFRUIT_STHS34PF80_H__
+
+#include "Arduino.h"
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_I2CDevice.h>
+#include <Wire.h>
+
+#define STHS34PF80_DEFAULT_ADDR 0x5A ///< Default I2C address for the STHS34PF80
+
+#define STHS34PF80_REG_LPF1 0x0C ///< Low-pass filter configuration 1 register
+#define STHS34PF80_REG_LPF2 0x0D ///< Low-pass filter configuration 2 register
+#define STHS34PF80_REG_WHO_AM_I 0x0F ///< Device identification register
+#define STHS34PF80_REG_AVG_TRIM 0x10 ///< Averaging configuration register
+#define STHS34PF80_REG_CTRL0 0x17 ///< Control register 0 (gain mode)
+#define STHS34PF80_REG_SENS_DATA 0x1D ///< Sensitivity data register
+#define STHS34PF80_REG_CTRL1 0x20 ///< Control register 1 (ODR configuration)
+#define STHS34PF80_REG_CTRL2 0x21 ///< Control register 2 (boot, function access, one-shot)
+#define STHS34PF80_REG_CTRL3 0x22 ///< Control register 3 (interrupt configuration)
+#define STHS34PF80_REG_STATUS 0x23 ///< Status register
+#define STHS34PF80_REG_FUNC_STATUS 0x25 ///< Function status register
+#define STHS34PF80_REG_TOBJECT_L 0x26 ///< Object temperature LSB register
+#define STHS34PF80_REG_TOBJECT_H 0x27 ///< Object temperature MSB register
+#define STHS34PF80_REG_TAMBIENT_L 0x28 ///< Ambient temperature LSB register
+#define STHS34PF80_REG_TAMBIENT_H 0x29 ///< Ambient temperature MSB register
+#define STHS34PF80_REG_TOBJ_COMP_L 0x38 ///< Compensated object temperature LSB register
+#define STHS34PF80_REG_TOBJ_COMP_H 0x39 ///< Compensated object temperature MSB register
+#define STHS34PF80_REG_TPRESENCE_L 0x3A ///< Presence detection LSB register
+#define STHS34PF80_REG_TPRESENCE_H 0x3B ///< Presence detection MSB register
+#define STHS34PF80_REG_TMOTION_L 0x3C ///< Motion detection LSB register
+#define STHS34PF80_REG_TMOTION_H 0x3D ///< Motion detection MSB register
+#define STHS34PF80_REG_TAMB_SHOCK_L 0x3E ///< Ambient shock detection LSB register
+#define STHS34PF80_REG_TAMB_SHOCK_H 0x3F ///< Ambient shock detection MSB register
+
+/*!
+ * @brief Class that stores state and functions for interacting with the STHS34PF80
+ */
+class Adafruit_STHS34PF80 {
+public:
+  Adafruit_STHS34PF80();
+  ~Adafruit_STHS34PF80();
+
+  bool begin(uint8_t i2c_addr = STHS34PF80_DEFAULT_ADDR, TwoWire *wire = &Wire);
+
+private:
+  Adafruit_I2CDevice *i2c_dev;
+};
+
+#endif

examples/test_sths34pf80/test_sths34pf80.ino

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+// Basic test for STHS34PF80 infrared sensor
+
+#include "Adafruit_STHS34PF80.h"
+
+Adafruit_STHS34PF80 sths;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println("Adafruit STHS34PF80 test!");
+
+  if (!sths.begin()) {
+    Serial.println("Could not find a valid STHS34PF80 sensor, check wiring!");
+    while (1) delay(10);
+  }
+
+  Serial.println("STHS34PF80 Found!");
+}
+
+void loop() {
+  delay(1000);
+}