Arduino_UNIT_HANDLER

Unit Handler is a library that could help you to set a frequency for analog to digital converter processing, it implements the polling process. You can handle more than one function and implement them separatly.

AD8232.ino

This file is an example that use Unit_Handler and RealTime_IIR library to do the analog to digital converting and a real-time filtering of the signal read from AD8232. AD8232 is a single-lead, heart rate monitor front-end.

Usage example:

Arduino_UNIT_HANDLER uses singleton design pattern, so to get an instance of this class you have to call the static member getInstance();

...
unitHandler = UNIT_HANDLER::getInstance( ); 
...

Now unitHandler is an instance to the Arduino_UNIT_HANDLER class. You can get the same instance in every part of the code with no risk to overwrite or change the object. After that, you can connect a function to unitHandler and say to it: 'execute it every 10ms, or 1s, or another sample time'.

// Connect printRawECG to unitHandler and execute it every 1/100 seconds
unitHandler->add(ECG_FS, printRawECG);  
// Connect leadsOffDetection to unitHandler and execute it every 1/1 second
unitHandler->add(LEADS_OFF_FS, leadsOffDetection);  

To allow unitHandler to do its job you have to write this in loop function:

void loop( ) {
    ...
    unitHandler->_check( );
    ...
}

In AD8232.ino you can view an example of this implementation.