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Adafruit_Sensor.h
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software< /span>
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Update by K. Townsend (Adafruit Industries) for lighter typedefs, and
* extended sensor support to include color, voltage and current */
#ifndef _ADAFRUIT_SENSOR_H
#define _ADAFRUIT_SENSOR_H
#ifndef ARDUINO
#include <stdint.h>
#elif ARDUINO >= 100
#include "Arduino.h"
#include "Print.h"
#else
#include "WProgram.h"
#endif
/* Constants */
#define SENSORS_GRAVITY_EARTH (9.80665F) /**< Earth's gravity in m/s^2 */
#define SENSORS_GRAVITY_MOON (1.6F) /**< The moon's gravity in m/s^2 */
#define SENSORS_GRAVITY_SUN (275.0F) /**< The sun's gravity in m/s^2 */
#define SENSORS_GRAVITY_STANDARD (SENSORS_GRAVITY_EARTH)
#define SENSORS_MAGFIELD_EARTH_MAX \
(60.0F) /**< Maximum magnetic field on Earth's surface */
#define SENSORS_MAGFIELD_EARTH_MIN \
(30.0F) /**< Minimum magnetic field on Earth's surface */
#define SENSORS_PRESSURE_SEALEVELHPA \
(1013.25F) /**< Average sea level pressure is 1013.25 hPa */
#define SENSORS_DPS_TO_RADS \
(0.017453293F) /**< Degrees/s to rad/s multiplier \
*/
#define SENSORS_RADS_TO_DPS \
(57.29577793F) /**< Rad/s to degrees/s multiplier */
#define SENSORS_GAUSS_TO_MICROTESLA \
(100) /**< Gauss to micro-Tesla multiplier */
/** Sensor types */
typedef enum {
SENSOR_TYPE_ACCELEROMETER = (1), /**< Gravity + linear acceleration */
SENSOR_TYPE_MAGNETIC_FIELD = (2),
SENSOR_TYPE_ORIENTATION = (3),
SENSOR_TYPE_GYROSCOPE = (4),
SENSOR_TYPE_LIGHT = (5),
SENSOR_TYPE_PRESSURE = (6),
SENSOR_TYPE_PROXIMITY = (8),
SENSOR_TYPE_GRAVITY = (9),
SENSOR_TYPE_LINEAR_ACCELERATION =
(10), /**< Acceleration not including gravity */
SENSOR_TYPE_ROTATION_VECTOR = (11),
SENSOR_TYPE_RELATIVE_HUMIDITY = (12),
SENSOR_TYPE_AMBIENT_TEMPERATURE = (13),
SENSOR_TYPE_OBJECT_TEMPERATURE = (14),
SENSOR_TYPE_VOLTAGE = (15),
SENSOR_TYPE_CURRENT = (16),
SENSOR_TYPE_COLOR = (17)
} sensors_type_t;
/** struct sensors_vec_s is used to return a vector in a common format. */
typedef struct {
union {
float v[3]; ///< 3D vector elements
struct {
float x; ///< X component of vector
float y; ///< Y component of vector
float z; ///< Z component of vector
}; ///< Struct for holding XYZ component
/* Orientation sensors */
struct {
float roll; /**< Rotation around the longitudinal axis (the plane body, 'X
axis'). Roll is positive and increasing when moving
downward. -90 degrees <= roll <= 90 degrees */
float pitch; /**< Rotation around the lateral axis (the wing span, 'Y
axis'). Pitch is positive and increasing when moving
upwards. -180 degrees <= pitch <= 180 degrees) */
float heading; /**< Angle between the longitudinal axis (the plane body)
and magnetic north, measured clockwise when viewing from
the top of the device. 0-359 degrees */
}; ///< Struct for holding roll/pitch/heading
}; ///< Union that can hold 3D vector array, XYZ components or
///< roll/pitch/heading
int8_t status; ///< Status byte
uint8_t reserved[3]; ///< Reserved
} sensors_vec_t;
/** struct sensors_color_s is used to return color data in a common format. */
typedef struct {
union {
float c[3]; ///< Raw 3-element data
/* RGB color space */
struct {
float r; /**< Red component */
float g; /**< Green component */
float b; /**< Blue component */
}; ///< RGB data in floating point notation
}; ///< Union of various ways to describe RGB colorspace
uint32_t rgba; /**< 24-bit RGBA value */
} sensors_color_t;
/* Sensor event (36 bytes) */
/** struct sensor_event_s is used to provide a single sensor event in a common
* format. */
typedef struct {
int32_t version; /**< must be sizeof(struct sensors_event_t) */
int32_t sensor_id; /**< unique sensor identifier */
int32_t type; /**< sensor type */
int32_t reserved0; /**< reserved */
int32_t timestamp; /**< time is in milliseconds */
union {
float data[4]; ///< Raw data
sensors_vec_t acceleration; /**< acceleration values are in meter per second
per second (m/s^2) */
sensors_vec_t
magnetic; /**< magnetic vector values are in micro-Tesla (uT) */
sensors_vec_t orientation; /**< orientation values are in degrees */
sensors_vec_t gyro; /**< gyroscope values are in rad/s */
float temperature; /**< temperature is in degrees centigrade (Celsius) */
float distance; /**< distance in centimeters */
float light; /**< light in SI lux units */
float pressure; /**< pressure in hectopascal (hPa) */
float relative_humidity; /**< relative humidity in percent */
float current; /**< current in milliamps (mA) */
float voltage; /**< voltage in volts (V) */
sensors_color_t color; /**< color in RGB component values */
}; ///< Union for the wide ranges of data we can carry
} sensors_event_t;
/* Sensor details (40 bytes) */
/** struct sensor_s is used to describe basic information about a specific
* sensor. */
typedef struct {
char name[12]; /**< sensor name */
int32_t version; /**< version of the hardware + driver */
int32_t sensor_id; /**< unique sensor identifier */
int32_t type; /**< this sensor's type (ex. SENSOR_TYPE_LIGHT) */
float max_value; /**< maximum value of this sensor's value in SI units */
float min_value; /**< minimum value of this sensor's value in SI units */
float resolution; /**< smallest difference between two values reported by this
sensor */
int32_t min_delay; /**< min delay in microseconds between events. zero = not a
constant rate */
} sensor_t;
/** @brief Common sensor interface to unify various sensors.
* Intentionally modeled after sensors.h in the Android API:
* https://github.com/android/platform_hardware_libhardware/blob/master/include/hardware/sensors.h
*/
class Adafruit_Sensor {
public:
// Constructor(s)
Adafruit_Sensor() {}
virtual ~Adafruit_Sensor() {}
// These must be defined by the subclass
/*! @brief Whether we should automatically change the range (if possible) for
higher precision
@param enabled True if we will try to autorange */
virtual void enableAutoRange(bool enabled) {
(void)enabled; /* suppress unused warning */
};
/*! @brief Get the latest sensor event
@returns True if able to fetch an event */
virtual bool getEvent(sensors_event_t *) = 0;
/*! @brief Get info about the sensor itself */
virtual void getSensor(sensor_t *) = 0;
void printSensorDetails(void);
private:
bool _autoRange;
};
#endif