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19 lines
309 B
C++
19 lines
309 B
C++
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#include "MQ4.h"
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MQ4::MQ4(uint8_t pin)
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: BaseMQ(pin) {
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}
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MQ4::MQ4(uint8_t pin, uint8_t pinHeater)
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: BaseMQ(pin, pinHeater) {
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}
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unsigned long MQ4::readMethane() {
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return readPpm(-0.36, 2.54);
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}
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int MQ4::readPpm(float a, float b) {
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float ratio = readRs()/_ro;
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return pow(M_E, (log(ratio)-b)/a);
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}
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