ElectrochemicalGasSensor Class Reference

#include <Electrochemical-Gas-Sensor-SOLDERED.h>

Public Member Functions
	ElectrochemicalGasSensor (sensorType _t, uint8_t _adcAddr=DEFAULT_ADC_ADDR, int _configPin=-1)
	Constructor on custom address.
bool	begin ()
	Init the sensor and begin measuring with the ADC, must be called before using.
bool	configureLMP ()
	Configure the LMP91000, has to be done at startup.
double	getVoltage ()
	get the voltage which the ADS is currently measuring
double	getPPM ()
	Make a measurement with the ADC and calculate the PPM value of the measured gas.
double	getPPB ()
	Calcualte PPB values from PPM.
double	getAveragedPPM (uint8_t _numMeasurements=5, uint8_t _secondsDelay=2)
	Calculate an averaged PPM measurement from a number of separate measurements.
double	getAveragedPPB (uint8_t _numMeasurements=5, uint8_t _secondsDelay=2)
	Calculate an averaged PPB measurement from a number of separate measurements.
void	setCustomTiaGain (float _tiaGain)
	Set a custom number of the kOhms in the TIA gain.
void	setCustomZeroCalibration (double calibration)
	Set a custom value for the zero calibration.

Private Member Functions
float	getTiaGain ()
	Get the actual number of the kOhms in the TIA gain.
float	getInternalZeroPercent ()
	Get the internal zero % setting as an actual float.

Private Attributes
LMP91000 *	lmp
ADS1115 *	ads
uint8_t	adcAddr
int	configPin
sensorType	type
float	tiaGainInKOHms
float	internalZeroPercent

Constructor & Destructor Documentation

ElectrochemicalGasSensor()

ElectrochemicalGasSensor::ElectrochemicalGasSensor	(	sensorType	_t,
		uint8_t	_adcAddr = DEFAULT_ADC_ADDR,
		int	_configPin = -1 )

Constructor on custom address.

Parameters

sensorType	_t The type of the sensor
uint8_t	_adcAddr The custom address of the ADC

Member Function Documentation

begin()

bool ElectrochemicalGasSensor::begin

(

)

Init the sensor and begin measuring with the ADC, must be called before using.

Returns

True if it was successful, false if it failed

configureLMP()

bool ElectrochemicalGasSensor::configureLMP

(

)

Configure the LMP91000, has to be done at startup.

Returns

True if it was successful, false if it failed

getAveragedPPB()

double ElectrochemicalGasSensor::getAveragedPPB	(	uint8_t	_numMeasurements = 5,
		uint8_t	_secondsDelay = 2 )

Calculate an averaged PPB measurement from a number of separate measurements.

Note

This is a blocking function, it won't exit until it's completed

Parameters

uint8_t	_numMeasurements How many measurements to do
uint8_t	_secondsDelay How many seconds to wait between each measurement

Returns

double value of the calculated averaged PPB

getAveragedPPM()

double ElectrochemicalGasSensor::getAveragedPPM	(	uint8_t	_numMeasurements = 5,
		uint8_t	_secondsDelay = 2 )

Calculate an averaged PPM measurement from a number of separate measurements.

Note

This is a blocking function, it won't exit until it's completed

Parameters

uint8_t	_numMeasurements How many measurements to do
uint8_t	_secondsDelay How many seconds to wait between each measurement

Returns

double value of the calculated averaged PPM

getInternalZeroPercent()

float ElectrochemicalGasSensor::getInternalZeroPercent ( )

private

Get the internal zero % setting as an actual float.

Returns

The internal zero as a float

getPPB()

double ElectrochemicalGasSensor::getPPB

(

)

Calcualte PPB values from PPM.

Returns

double value of PPB

getPPM()

double ElectrochemicalGasSensor::getPPM

(

)

Make a measurement with the ADC and calculate the PPM value of the measured gas.

Returns

double value of the PPM

getTiaGain()

float ElectrochemicalGasSensor::getTiaGain ( )

private

Get the actual number of the kOhms in the TIA gain.

Note

Only used internally in the class

Returns

float of the TIA gain depending on the config

getVoltage()

double ElectrochemicalGasSensor::getVoltage

(

)

get the voltage which the ADS is currently measuring

Returns

double value of the voltage in volts

setCustomTiaGain()

void ElectrochemicalGasSensor::setCustomTiaGain

(

float

_tiaGain

)

Set a custom number of the kOhms in the TIA gain.

Note

This is if you're using an external resistor

Returns

None

setCustomZeroCalibration()

void ElectrochemicalGasSensor::setCustomZeroCalibration

(

double

calibration

)

Set a custom value for the zero calibration.

Parameters

calibration

Voltage level at 0ppm

Member Data Documentation

adcAddr

uint8_t ElectrochemicalGasSensor::adcAddr

private

ads

ADS1115* ElectrochemicalGasSensor::ads

private

configPin

int ElectrochemicalGasSensor::configPin

private

internalZeroPercent

float ElectrochemicalGasSensor::internalZeroPercent

private

lmp

LMP91000* ElectrochemicalGasSensor::lmp

private

tiaGainInKOHms

float ElectrochemicalGasSensor::tiaGainInKOHms

private

type

sensorType ElectrochemicalGasSensor::type

private

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The documentation for this class was generated from the following files:

• Electrochemical-Gas-Sensor-SOLDERED.h
• Electrochemical-Gas-Sensor-SOLDERED.cpp