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49 lines
836 B
C++
49 lines
836 B
C++
//
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// FILE: MHZCO2_analog.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo MHZ library / sensor
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// DATE: 2020-09-01
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#include "Arduino.h"
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#include "MHZCO2.h"
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/*
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DATASHEET P.7
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Conversion between analog voltage output and concentration,
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take 0.4V ~ 2V as an example:
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Vo(V) = 0.4V + (2.0V - 0.4V) * C(concentration ppm) / range(ppm)
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C = (Vo - 0.4 V ) * range / 1.6;
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*/
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void setup()
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{
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Serial.begin(115200);
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// Serial.println(__FILE__);
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// Serial.print("MHZCO2_LIB_VERSION: ");
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// Serial.println(MHZCO2_LIB_VERSION);
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}
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void loop()
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{
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uint16_t C = concentration(A0, 2000);
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Serial.println(C);
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}
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uint16_t concentration(int port, uint16_t maxConcentration)
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{
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float volt = analogRead(port) * (5.0 / 1023.0);
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uint16_t C = (volt - 0.4) * maxConcentration / 1.6;
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return C;
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}
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// -- END OF FILE --
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