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Diffstat (limited to 'peripheral/libupm/src/otp538u/otp538u.h')
-rw-r--r-- | peripheral/libupm/src/otp538u/otp538u.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/peripheral/libupm/src/otp538u/otp538u.h b/peripheral/libupm/src/otp538u/otp538u.h new file mode 100644 index 0000000..cc81719 --- /dev/null +++ b/peripheral/libupm/src/otp538u/otp538u.h @@ -0,0 +1,154 @@ +/* + * Author: Jon Trulson <jtrulson@ics.com> + * Copyright (c) 2015 Intel Corporation. + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#pragma once + +#include <string> +#include <mraa/aio.h> + +namespace upm { + + /** + * @brief OTP538U IR Temperature Sensor library + * @defgroup otp538u libupm-otp538u + * @ingroup seeed analog light hak + */ + /** + * @library otp538u + * @sensor otp538u + * @comname OTP538U IR Temperature Sensor + * @altname Grove IR Temperature Sensor + * @type light + * @man generic + * @con analog + * @kit hak + * + * @brief API for the OTP538U IR Temperature Sensor + * + * UPM module for the OTP538U IR temperature sensor + * + * This module was tested with the Grove IR non-contact temperature + * sensor. + * + * The sensor provides 2 analog outputs: one for the thermistor + * that measures the ambient temperature, and the other for the thermopile + * that measures the object temperature. + * + * Much of the code depends on analyzing Seeed Studio* examples + * and the circuit design. As a result, there are several 'magic' + * numbers derived from their circuit design. These values are used + * by default. + * + * The tables used came from the "538U VT + * Table__20_200(v1.3).pdf" and "538RT_table.pdf" datasheets. + * + * These tables assume the object to be measured is 9 cm (3.54 + * inches) from the sensor. + * + * @image html otp538u.jpg + * @snippet otp538u.cxx Interesting + */ + class OTP538U { + public: + /** + * OTP538U constructor + * + * @param pinA Analog pin to use for the ambient temperature + * @param pinO Analog pin to use for the object temperature + * @param aref Analog reference voltage; default is 5.0 V + */ + OTP538U(int pinA, int pinO, float aref = 5.0); + + /** + * OTP538U destructor + */ + ~OTP538U(); + + /** + * Gets the ambient temperature in Celsius + * + * @return Ambient temperature + */ + float ambientTemperature(); + + /** + * Gets the object temperature in Celsius + * + * @return Object temperature + */ + float objectTemperature(); + + /** + * Sets the offset voltage + * + * The Seeed Studio wiki gives an example of calibrating the sensor + * and calculating the offset voltage to apply. Currently, the + * default value is set, but you can use the function to set one + * of your own. + * + * @param vOffset Desired offset voltage + */ + void setVoltageOffset(float vOffset) { m_offsetVoltage = vOffset; }; + + /** + * Sets the output resistance value + * + * The Seeed Studio wiki example uses a value of 2,000,000 in one of + * the equations used to calculate voltage. The value is the + * resistance of a resistor they use in the output stage of their + * SIG2 output. This was 'decoded' by looking at the EAGLE* files + * containing their schematics for this device. + * + * @param outResistance Value of the output resistor; default is 2M Ohm + */ + void setOutputResistence(int outResistance) { + m_vResistance = outResistance; }; + + /** + * Sets the reference voltage of the internal Seeed Studio voltage + * regulator on the sensor board. + * + * The Seeed Studio wiki example uses a value of 2.5 in one of the + * equations used to calculate the resistance of the ambient + * thermistor. The value is the voltage of an internal voltage + * regulator used on the sensor board. This was 'decoded' by + * looking at the EAGLE files containing their schematics for this + * device. + * + * @param vref Reference voltage of the internal sensor; default is 2.5 V + */ + void setVRef(float vref) { m_vref = vref; }; + + + private: + float m_vref; + float m_aref; + int m_vResistance; + float m_offsetVoltage; + int m_adcResolution; + mraa_aio_context m_aioA; + mraa_aio_context m_aioO; + }; +} + + |