mirror of
https://github.com/amperka/TroykaMQ.git
synced 2025-03-15 12:37:46 +03:00
27 lines
450 B
C++
27 lines
450 B
C++
#include "MQ9.h"
|
|
|
|
MQ9::MQ9(uint8_t pin)
|
|
: BaseMQ(pin) {
|
|
}
|
|
|
|
MQ9::MQ9(uint8_t pin, uint8_t pinHeater)
|
|
: BaseMQ(pin, pinHeater) {
|
|
}
|
|
|
|
unsigned long MQ9::readLPG() {
|
|
return readPpm(-0.48, 3.33);
|
|
}
|
|
|
|
unsigned long MQ9::readMethane() {
|
|
return readPpm(-0.38, 3.21);
|
|
}
|
|
|
|
unsigned long MQ9::readCarbonMonoxide() {
|
|
return readPpm(-0.48, 3.10);
|
|
}
|
|
|
|
int MQ9::readPpm(float a, float b) {
|
|
float ratio = readRs()/_ro;
|
|
return pow(M_E, (log(ratio)-b)/a);
|
|
}
|