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This commit is contained in:
GrafZeppelin 2021-04-03 19:21:52 +02:00
parent b0ac32d423
commit 360211d2c2
1 changed files with 1 additions and 4 deletions
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5
lib/MQ135New/MQ135New.cpp
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@ -12,14 +12,12 @@ double MQ135::getRS() {
double MQ135::getVoltage() {
int value = analogRead(_pin);
double voltage = (double)(value * VIn) / (double)(Resolution);
double voltage = (double)(value * VIn) / (double)(Resolution - 1);
return voltage;
}
double MQ135::getPPM(float a, float b) {
double ratio = getRS() / R0;
// double ppm_log = (log10(ratio) - b) / a;
// double ppm = pow(10, ppm_log);
double ppm = a * pow(ratio, b);
return ppm;
}
@ -33,7 +31,6 @@ double MQ135::getAlcohol() {
}
double MQ135::getCO2() {
// return getPPM(-0.3525, 0.7142) + ATMOCO2;
return getPPM(110.47, -2.862) + ATMOCO2;
}