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#idndef for RLOAD and RZERO #21

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#idndef for RLOAD and RZERO #21

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42f9883
Update MQ135.h
otmezger Jun 12, 2022
ced1b10
Merge pull request #1 from otmezger/otmezger-patch-1
otmezger Jun 12, 2022
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6 changes: 6 additions & 0 deletions MQ135.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,9 +22,15 @@ v1.0 - First release
#endif

/// The load resistance on the board
#ifndef RLOAD
#define RLOAD 10.0
#endif

/// Calibration resistance at atmospheric CO2 level
#ifndef RZERO
#define RZERO 76.63
#endif

/// Parameters for calculating ppm of CO2 from sensor resistance
#define PARA 116.6020682
#define PARB 2.769034857
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