DS18S20 Class Reference

This class implements access to the DS18x20 range of temperature sensors. More...

#include <ds18s20.h>

Public Member Functions
	DS18S20 ()
	Instantiate a DS18S20 object. More...
void	Init (uint8_t)
	Initiate communication on 1-wire bus. More...
void	StartMeasure ()
	Start measurement of all connected sensors. More...
void	RegisterEndCallback (DS18S20CompletedDelegate)
	Register the callback function that is run when measurement is complete. More...
void	UnRegisterCallback ()
	Unregister the callback function to avoid activity after measurement is complete. More...
float	GetCelsius (uint8_t)
	Get the value of the last measurment from a sensor. More...
float	GetFahrenheit (uint8_t)
	Get the value of the last measurment from a sensor. More...
bool	IsValidTemperature (uint8_t)
	Check if the last measurement for a sensor is valid. More...
bool	MeasureStatus ()
	Check if measurement is in progress. More...
uint64_t	GetSensorID (uint8_t)
	Get the ID (1-wire address) of a sensor. More...
uint8_t	GetSensorsCount ()
	Get the quantity of sensors detected during last measurement. More...

Detailed Description

This class implements access to the DS18x20 range of temperature sensors.

Constructor & Destructor Documentation

DS18S20::DS18S20

(

)

Instantiate a DS18S20 object.

Member Function Documentation

float DS18S20::GetCelsius

(

uint8_t

)

Get the value of the last measurment from a sensor.

Parameters

Index

of sensor to retrieve value from

Returns

Temperature value in degrees Celsius or zero for invalid sensor index

Note

Call IsValidTemperature() to check value is valid before calling this function

float DS18S20::GetFahrenheit

(

uint8_t

)

Get the value of the last measurment from a sensor.

Parameters

Index

of sensor to retrieve value from

Returns

Temperature value in degrees Fahrenheit or zero for invalid sensor index

Note

Call IsValidTemperature() to check value is valid before calling this function

uint64_t DS18S20::GetSensorID

(

uint8_t

)

Get the ID (1-wire address) of a sensor.

Parameters

Index

of sensor

Returns

ID of sensor

uint8_t DS18S20::GetSensorsCount

(

)

Get the quantity of sensors detected during last measurement.

Returns

Quantity of detected sensors

Note

Maximum quantity of sensors is defined in library header file by MAX_SENSORS

void DS18S20::Init

(

uint8_t

)

Initiate communication on 1-wire bus.

Parameters

GPIO	pin acting as 1-wire bus

bool DS18S20::IsValidTemperature

(

uint8_t

)

Check if the last measurement for a sensor is valid.

Parameters

Index

of sensor to check

Returns

True if last measured temperature is valid, false for invalid value or invalid sensor index

Note

Call this function before reading value to ensure the value is valid

Todo:

Initial code review suggests this is set once but never rechecked so may not be accurate

bool DS18S20::MeasureStatus

(

)

Check if measurement is in progress.

Returns

True if measurement is in progress

void DS18S20::RegisterEndCallback

(

DS18S20CompletedDelegate

)

Register the callback function that is run when measurement is complete.

Parameters

Name	of the callback function

Note

Callback function must be a DS18S20CommpleteDelegate type

void DS18S20::StartMeasure

(

)

Start measurement of all connected sensors.

Note

Scans for all connected sensors, measures value from each then calls the registered callback function

void DS18S20::UnRegisterCallback

(

)

Unregister the callback function to avoid activity after measurement is complete.