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174 lines
5.6 KiB
174 lines
5.6 KiB
// -----------------------------------------------------------------------------
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// GUVA-S12SD UV Sensor
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// Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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// by Mustafa Tufan
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && GUVAS12SD_SUPPORT
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#pragma once
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#include "BaseSensor.h"
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#include "../utils.h"
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// http://www.eoc-inc.com/genicom/GUVA-S12SD.pdf
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//
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// GUVA-S12D has a wide spectral range of 200nm-400nm
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// The output voltage and the UV index is linear, illumination intensity = 307 * Vsig where: Vsig is the value of voltage measured from the SIG pin of the interface, unit V.
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// illumination intensity unit: mW/m2 for the combination strength of UV light with wavelength range: 200nm-400nm
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// UV Index = illumination intensity / 200
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//
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// UV Index | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 10+
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// -----------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------+--------
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// mV | <50 | 227 | 318 | 408 | 503 | 606 | 696 | 795 | 881 | 976 | 1079 | 1170+
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// analog val | <10 | 46 | 65 | 83 | 103 | 124 | 142 | 162 | 180 | 200 | 221 | 240+
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//
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#define UV_SAMPLE_RATE 1
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class GUVAS12SDSensor : public BaseSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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GUVAS12SDSensor() {
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_count = 1;
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_sensor_id = SENSOR_GUVAS12SD_ID;
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}
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~GUVAS12SDSensor() {
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gpioUnlock(_gpio);
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}
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// ---------------------------------------------------------------------
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void setGPIO(unsigned char gpio) {
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_gpio = gpio;
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}
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// ---------------------------------------------------------------------
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unsigned char getGPIO() {
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return _gpio;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() {
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// Manage GPIO lock
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if (_previous != GPIO_NONE) {
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gpioUnlock(_previous);
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}
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_previous = GPIO_NONE;
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if (!gpioLock(_gpio)) {
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_error = SENSOR_ERROR_GPIO_USED;
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return;
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}
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_previous = _gpio;
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_ready = true;
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}
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// Pre-read hook (usually to populate registers with up-to-date data)
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void pre() {
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_error = SENSOR_ERROR_OK;
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_read();
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}
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// Descriptive name of the sensor
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String description() {
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char buffer[18];
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snprintf(buffer, sizeof(buffer), "GUVAS12SD @ GPIO%hhu", _gpio);
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String description(unsigned char index) {
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return description();
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};
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// Address of the sensor (it could be the GPIO or I2C address)
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String address(unsigned char index) {
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return String(_gpio);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) {
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if (index == 0) return MAGNITUDE_UVI;
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return MAGNITUDE_NONE;
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index == 0) return _uvindex;
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return 0;
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}
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protected:
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// ---------------------------------------------------------------------
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// Protected
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// ---------------------------------------------------------------------
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void _read() {
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int _average = 0;
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#if UV_SAMPLE_RATE == 1
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_average = analogRead(0);
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#else
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for (unsigned int i=0; i < UV_SAMPLE_RATE; i++) {
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_average += analogRead(0);
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nice_delay(2);
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}
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_average = (_average / UV_SAMPLE_RATE);
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#endif
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// _sensormV = _average / 1023*3.3;
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if (_average < 10) {
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_uvindex = 0;
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} else if (_average < 46) {
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_uvindex = (_average - 10) / (46-10);
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} else if (_average < 65) {
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_uvindex = 1 + ((_average - 46) / (65-46));
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} else if (_average < 83) {
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_uvindex = 2 + ((_average - 65) / (83-65));
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} else if (_average < 103) {
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_uvindex = 3 + ((_average - 83) / (103- 83));
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} else if (_average < 124) {
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_uvindex = 4 + ((_average - 103) / (124-103));
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} else if (_average < 142) {
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_uvindex = 5 + ((_average - 124) / (142-124));
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} else if (_average < 162) {
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_uvindex = 6 + ((_average - 142) / (162-142));
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} else if (_average < 180) {
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_uvindex = 7 + ((_average - 162) / (180-162));
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} else if (_average < 200) {
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_uvindex = 8 + ((_average - 180) / (200-180));
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} else if (_average < 221) {
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_uvindex = 9 + ((_average - 200) / (221-200));
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} else {
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_uvindex = 10;
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}
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}
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unsigned char _gpio = GPIO_NONE;
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unsigned char _previous = GPIO_NONE;
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double _uvindex = 0;
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};
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#endif // SENSOR_SUPPORT && GUVAS12SD_SUPPORT
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