MHZ19 Namespace Reference

Classes
class	PwmReader
	Reads input pulse width asynchronously. More...
struct	Request
struct	Response
struct	Measurement
class	Uart
	Access MHZ19 sensor via serial port. More...

Typedefs
using	MeasurementCallback = Delegate< void(Measurement &m)>

Enumerations
enum class	DetectionRange { PPM_2000 = 2000 , PPM_5000 = 5000 , PPM_10000 = 10000 }
	Device may be configured to output CO2 PPM values in various ranges. More...
enum	Command {   CMD_GasConcentration = 0x86 , CMD_CalibrateZeroPoint = 0x87 , CMD_CalibrateSpanPoint = 0x88 , CMD_SelfCalbrationOnOff = 0x79 ,   CMD_SetDetectionRange = 0x99 }
	Available commands. More...
enum class	Error { success , incompleteResponse , invalidResponse , timeout }

Functions
unsigned	pwmRead (uint8_t pwmPin, DetectionRange range)
	Read PWM output from sensor. More...

Typedef Documentation

MeasurementCallback

using MHZ19::MeasurementCallback = typedef Delegate<void(Measurement& m)>

Enumeration Type Documentation

Command

enum MHZ19::Command

Available commands.

Support differs by device variant

Enumerator
CMD_GasConcentration	-, B, C
CMD_CalibrateZeroPoint	-, B
CMD_CalibrateSpanPoint	-, B
CMD_SelfCalbrationOnOff	B, C.
CMD_SetDetectionRange	B.

DetectionRange

enum MHZ19::DetectionRange

strong

Device may be configured to output CO2 PPM values in various ranges.

Enumerator
PPM_2000
PPM_5000
PPM_10000

Error

enum MHZ19::Error

strong

Enumerator
success
incompleteResponse
invalidResponse
timeout

Function Documentation

pwmRead()

unsigned MHZ19::pwmRead	(	uint8_t	pwmPin,
		DetectionRange	range
	)

Read PWM output from sensor.

Parameters

pwmPin	GPIO to which the sensor is connected
range	Range sensor is configured for

Note

This will hang CPU for 1-2 seconds. Use PwmReader instead.