65 lines
1.1 KiB
C++
65 lines
1.1 KiB
C++
#include "MQ135New.h"
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MQ135::MQ135(uint8_t pin) {
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_pin = pin;
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}
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double MQ135::getVoltage() {
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return (double)analogRead(_pin) * VStep;
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}
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double MQ135::getResistance() {
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double voltage = getVoltage();
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double rs = ((VIn * RL) / voltage) - RL;
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if (rs < 0) {
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rs = 0;
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}
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return rs;
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}
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double MQ135::getPPM(float a, float b) {
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double ratio = getResistance() / R0;
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double ppm = a * pow(ratio, b);
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if (ppm < 0) {
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ppm = 0;
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}
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return ppm;
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}
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double MQ135::getAcetona() {
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return getPPM(34.668, -3.369);
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}
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double MQ135::getAlcohol() {
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return getPPM(77.255, -3.18);
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}
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double MQ135::getCO2() {
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return getPPM(110.47, -2.862) + ATMOCO2;
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}
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double MQ135::getCO() {
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return getPPM(605.18, -3.937);
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}
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double MQ135::getNH4() {
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return getPPM(102.2, -2.473);
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}
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double MQ135::getTolueno() {
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return getPPM(44.947, -3.445);
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}
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float MQ135::getR0() {
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double r0 = getResistance() / 3.6;
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return r0;
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}
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double MQ135::getR0By(float ppm, float a, float b) {
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double tmp = (log10(ppm / a) / b) - log10(RL);
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return pow(10, tmp);
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}
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void MQ135::setR0(float r0) {
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R0 = r0;
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}
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