Functions needed for multiple instances of the SDI12 class. More...

Functions
bool	SDI12::setActive ()
	Set this instance as the active SDI-12 instance. More...

bool	SDI12::isActive ()
	Check if this instance is active. More...

Detailed Description

Functions needed for multiple instances of the SDI12 class.

This library is allows for multiple instances of itself running on the same or different pins. SDI-12 can support up to 62 sensors on a single pin/bus, so it is not necessary to use an instance for each sensor.

Because we are using pin change interrupts there can only be one active object at a time (since this is the only reliable way to determine which pin the interrupt occurred on). The active object is the only object that will respond properly to interrupts. However promoting another instance to Active status does not automatically remove the interrupts on the other pin. For proper behavior it is recommended to use this pattern:

mySDI12.forceHold();

myOtherSDI12.setActive();

Other notes:

Promoting an object into the Active state will set it as SDI12_HOLDING.
Calling mySDI12.begin() will assert mySDI12 as the new active object, until another instance calls myOtherSDI12.begin() or myOtherSDI12.setActive().
Calling mySDI12.end() does NOT hand-off active status to another SDI-12 instance.
You can check on the active object by calling mySDI12.isActive(), which will return a boolean value TRUE if active or FALSE if inactive.

Function Documentation

◆ isActive()

bool SDI12::isActive ( )

Check if this instance is active.

Returns: bool True indicates that the curren SDI-12 instace is the active one.

isActive() is a method for checking if the object is the active object. Returns true if the object is currently the active object, false otherwise.

◆ setActive()

bool SDI12::setActive ( )

Set this instance as the active SDI-12 instance.

Returns: bool True indicates that the current SDI-12 instance was not formerly the active one and now is. False indicates that the current SDI-12 instance is already the active one and the state was not changed.

A method for setting the current object as the active object; returns TRUE if the object was not formerly the active object and now is.

Promoting an inactive to the active instance will start it in the SDI12_HOLDING state and return TRUE.
Otherwise, if the object is currently the active instance, it will remain unchanged and return FALSE.