PicoC filter for presence and motion detectors

[Gast]

When attaching my four Esylux motion detectors to the Loxone system, I found that their signals were non-continuously and therefore hard to use within my programming ideas.
After creating two Loxone pages full of building blocks, components and connection lines, I decided to go another way: building a simple program that filters the four signals before using them any further.

So, I added the script below to share. Feel free to use it and any comments or suggestions for improvement are welcome!

//
// Smart Sensor Filter
// Tested with Sensor Esylux PD-C360I/8 DC24VPLUS
// Tested with Loxone firmware v10
// By: Richard Verkaik
//
// Version 20180920
//
// Prologue
//
// Many sensors used in toilets and bathrooms, send short signals every 5 seconds
// when an entity is detected. These pulses are hard to use in Loxone, even with
// the Ventilation Programming Block. This filter captures these nasty pulses and
// provides clean, constant signals on the corresponding outputs.
//
// 1. The first 4 analogue ports are monitored for input values > 0 (rising edges)
// 2. First puls is ignored for STP
// 3. The filter applies 2 minutes continuity TIMEOUT
//
// (STP = Swinging Towel Protection)
//

#define BitPort0  8  // 2^3, bit 3 or AI1
#define BitPort1 16  // 2^4, bit 4 or AI2
#define BitPort2 32  // 2^5, bit 5 or AI3
#define BitPort3 64  // 2^6, bit 6 or AI4

#define ON  1
#define OFF 0

enum OutputPorts
{
    OutputPort0,   // AQ1
    OutputPort1,   // AQ2
    OutputPort2,   // AQ3
    OutputPort3    // AQ4
};

// Modify these values to meet your own preferences
int nSTPseconds = 10;
int nTIMEOUTseconds = 120;

unsigned int InputStatus [4] = { 0, 0, 0, 0 };
int PortSwitch [4] = { OFF, OFF, OFF, OFF };
int nEvents;
unsigned int nCurrentTime;

void UpdateStatus( int InputNumber ) {
    if (getinput(InputNumber) > 0) { // Only respond to Rising Edge
        // printf("Event Trigger %d received at %d", InputNumber, nCurrentTime);
        if (InputStatus[InputNumber] == 0) {
            InputStatus[InputNumber] = 0 - nCurrentTime; // First Pulse
            // printf("     InputStatus[%d] Time: %d", InputNumber, InputStatus[InputNumber]);
            // printf("     STP time: %d", (-InputStatus[InputNumber]) + nSTPseconds);
        } else {
            InputStatus[InputNumber] = nCurrentTime; // Following Pulse within nSTPseconds
            // printf("     InputStatus[%d] Time: %d", InputNumber, InputStatus[InputNumber]);
            // printf("     TIMEOUT time: %d", InputStatus[InputNumber] + nTIMEOUTseconds);
        }
        if (InputStatus[InputNumber] > 0) {
            PortSwitch[InputNumber] = ON;
        }
        // printf("     PortSwitch %d = %d", InputNumber, PortSwitch[InputNumber]);
    }
}

void EvaluatePort( int PortNumber ) {
    if (InputStatus[PortNumber] < 0) {
        if (((-InputStatus[PortNumber]) + nSTPseconds) < nCurrentTime) {
            InputStatus[PortNumber] = 0;
            PortSwitch[PortNumber] = OFF;
            // printf("Port %d reset due to STP", PortNumber);
        }
    } else if (InputStatus[PortNumber] > 0) {
        if ((InputStatus[PortNumber] + nTIMEOUTseconds) < nCurrentTime) {
            InputStatus[PortNumber] = 0;
            PortSwitch[PortNumber] = OFF;
            // printf("Port %d switched OFF after timeout", PortNumber);
        }
    }
}

while(TRUE)
{
    nCurrentTime = getcurrenttime();
    nEvents = getinputevent();

    // Process input triggers...
    if (nEvents) {
        if (nEvents & BitPort0) UpdateStatus(0);
        if (nEvents & BitPort1) UpdateStatus(1);
        if (nEvents & BitPort2) UpdateStatus(2);
        if (nEvents & BitPort3) UpdateStatus(3);
    }

    // Evaluate Ports...
    if (InputStatus[0] != 0) EvaluatePort(0);
    if (InputStatus[1] != 0) EvaluatePort(1);
    if (InputStatus[2] != 0) EvaluatePort(2);
    if (InputStatus[3] != 0) EvaluatePort(3);

    // Update all Ports...
    setoutput(OutputPort0, PortSwitch[0]);
    setoutput(OutputPort1, PortSwitch[1]);
    setoutput(OutputPort2, PortSwitch[2]);
    setoutput(OutputPort3, PortSwitch[3]);

    sleep(300);
}