WiringX Using HC-SR312 and buildin LED demo

Duo
1

HC-SR312 has three PIN

VCC （2.7 -12V）connect to 3.3V
OUT connect to GP15
GND connect to GND

This code will make the Buildin LED(GP25) in Duo256 up when HC-SR312 detect human move, and keep it on for 60s.

#include <stdio.h>
#include <unistd.h>
#include <time.h> // Add this for time functions

#include <wiringx.h>

int main() {
    int DUO_LED = 25;
    int DUO_KEY = 15;

    if(wiringXSetup("milkv_duo256m", NULL) == -1) {
        wiringXGC();
        return 1;
    }

    if(wiringXValidGPIO(DUO_LED) != 0) {
        printf("Invalid GPIO %d\n", DUO_LED);
    }

    pinMode(DUO_LED, PINMODE_OUTPUT);

    if(wiringXValidGPIO(DUO_KEY) != 0) {
        printf("Invalid GPIO %d\n", DUO_KEY);
    }

    pinMode(DUO_KEY, PINMODE_INPUT);

    // Initialize variables for the timer
    time_t start_time;
    int led_on = 0; // Flag to check if LED is already on

    while(1) {
        if(digitalRead(DUO_KEY) == 1 && !led_on) { // If key pressed and LED is not already on
            digitalWrite(DUO_LED, HIGH);
            led_on = 1; // Set flag
            start_time = time(NULL); // Start timer
        } else if (led_on) { // If LED is on
            time_t current_time = time(NULL);
            if(difftime(current_time, start_time) >= 60) { // Check if 60 seconds have passed
                digitalWrite(DUO_LED, LOW);
                led_on = 0; // Reset flag
            }
        }
        usleep(100000);
    }

    return 0;
}
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