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178 lines
4.2 KiB
178 lines
4.2 KiB
// -----------------------------------------------------------------------------
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// LDR Sensor (maps to a LDRSensor)
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// Copyright (C) 2019 by Altan Altay
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && LDR_SUPPORT
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#pragma once
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#include "AnalogSensor.h"
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extern "C" {
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#include "../libs/fs_math.h"
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}
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#define LDR_GL5516 1
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#define LDR_GL5528 2
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#define LDR_GL5537_1 3
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#define LDR_GL5537_2 4
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#define LDR_GL5539 5
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#define LDR_GL5549 6
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#define LDR_OTHER 99
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class LDRSensor : public AnalogSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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LDRSensor() {
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_count = 1;
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_sensor_id = SENSOR_LDR_ID;
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}
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void setType(unsigned char type) {
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_type = type;
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switch (_type) {
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case LDR_GL5516:
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_mult_value = 29634400;
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_pow_value = 1.6689;
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break;
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case LDR_GL5537_1:
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_mult_value = 32435800;
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_pow_value = 1.4899;
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break;
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case LDR_GL5537_2:
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_mult_value = 2801820;
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_pow_value = 1.1772;
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break;
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case LDR_GL5539:
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_mult_value = 208510000;
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_pow_value = 1.4850;
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break;
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case LDR_GL5549:
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_mult_value = 44682100;
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_pow_value = 1.2750;
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break;
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case LDR_OTHER:
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_mult_value = LDR_MULTIPLICATION;
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_pow_value = LDR_POWER;
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break;
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case LDR_GL5528:
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default:
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_mult_value = 32017200;
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_pow_value = 1.5832;
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break;
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}
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}
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/*!
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* \brief setPhotocellPositionOnGround Configure the photocell as connected to 3.3V or GND
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*
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* \param on_ground (bool) True if the photocell is connected to GND, else false
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*
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* True: EXTERNAL ADC
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* ^ ^
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* _____ | ___/___
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* 3.3V |---|_____|--*--|__/____|--| GND
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* Other /
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* Resistor Photocell
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*
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* False:
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* EXTERNAL ADC
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* ^ ^
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* _____ | ___/___
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* GND |---|_____|--*--|__/____|--| 3.3V
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* Other /
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* Resistor Photocell
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*/
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void setPhotocellPositionOnGround(bool on_ground) {
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_photocell_on_ground = on_ground;
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}
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void setResistor(unsigned long resistor) {
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_resistor = resistor;
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}
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/*!
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* \brief updatePhotocellParameters Redefine the photocell parameters
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*
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* \parameter mult_value (float) Multiplication parameter in "I[lux]=mult_value/(R[Ω]^pow_value)" expression
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* \parameter pow_value (float) Power parameter in "I[lux]=mult_value/(R[Ω]^pow_value)" expression
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*/
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void setPhotocellParameters(float mult_value, float pow_value) {
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if (_type == LDR_OTHER) {
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_mult_value = mult_value;
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_pow_value = pow_value;
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}
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}
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// ---------------------------------------------------------------------
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Descriptive name of the sensor
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String description() {
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return String("LDR @ TOUT");
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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("0");
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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_LUX;
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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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double current_lux = 0;
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if (index == 0) {
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unsigned long photocell_resistor = 0;
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// sampled reading
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double read = _read();
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float ratio = ((float)1024/(float)read) - 1;
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if (_photocell_on_ground) {
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photocell_resistor = _resistor / ratio;
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} else {
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photocell_resistor = _resistor * ratio;
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}
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current_lux = _mult_value / (float)pow(photocell_resistor, _pow_value);
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}
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return current_lux;
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}
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protected:
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unsigned char _type = LDR_GL5528;
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bool _photocell_on_ground = false;
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unsigned long _resistor = 10000;
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float _mult_value = 0;
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float _pow_value = 0;
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};
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#endif // SENSOR_SUPPORT && LDR_SUPPORT
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