Threshold checking for a realtime signal

SruDom

Hi
I have a realtime signal from a sensor. I need logic to implement a masking time once the signal is above a threshold. Here, masking time is a time period masked for any threshold checking. This is how I can differentiate positive and negative pulse As shown below:

(during a postive pulse there is a negative-going side but it should not detect as a "negative pulse").

Lets say the masking time period is 0.5 seconds in my case. How do I implement this logic in Qt.
I can get the current time and compare for a threshold as shown below, but don't know how to mask for threshold checking for a period of time (say 0.5sec)

static QTime time(QTime::currentTime());
// calculate two new data points:
double key = time.elapsed()/1000.0; // time elapsed since start of demo, in seconds


if(a_vertical> onThreshold) // is this check correct for masking time?
    {
   
        ui->rdo_btn_vertical->setStyleSheet(StyleSheetOn1); // On  LED
        lastKey = key;
    }
    else
    {
        ui->rdo_btn_vertical->setStyleSheet(StyleSheetOff1); // Off LED
    }

Any ideas / feedbacks are welcome

artwaw

Let's start with the basics: do you get any measurable values from the port the signaling device is connected?
If so, based on your drawings, knowing the threshold value:

assume threshold is zero.
treat all the values below the threshold (zero) as negative in relation to threshold.
accordingly, all the values above threshold (zero) as positive in relation to threshold.
sum all those up.
if value is positive you have negative pulse, otherwise negative.

But that assumes that you have measurable values from the sensor + that drawings represent accurate tendencies.