To use this extension board, use the ExpansionPhotoInput class of the PHPoC Expansion library.
Available member functions of the ExpansionPhotoInput class are as follows:
|int getPID(void)||get the product's ID|
|char *getName(void)||get the product's name|
|ExpansionPhotoInput(int sid, int port)||create an instance of a specific input port|
|bool isOn(void)||return true when an input port is ON|
|bool isOff(void)||return true when an input port is OFF|
|void setDelay(int ms)||set valid time(millisecond)|
If the input signal level changes but does not be maintained for the specified delay time, this board will ignore it. The unit is milliseconds and the setting range is 1 to 30,000. If set to zero, the minimum value is applied. This delay time takes effect until the another setting for the same port is run.
This function is designed to avoid impact of the chattering phenomenon. This phenomenon happens when a manual switch repeatedly turns on and off in a short time because of vibration of the contact. This may cause malfunction in some kind of application.