an exit button that opens a door

robertscode.ino

// Define interfaces
#define LED_PIN 26 // —>|–[R]—3v3
#define RELAY_PIN 33
#define BUTTON_PIN 25 // —./.—-0V
// Define Timings
#define LED_ACTIVE_ON 0.2 // Flashing when relay output is active
#define LED_ACTIVE_OFF 0.2 // Time in seconds
#define LED_IDLE_ON 12 // On with short turn off when idle
#define LED_IDLE_OFF 0.5
#define RELAY_INTERVAL 6 // duration relay operates in seconds
#define DEBOUNCE 0.025 // wait 25 ms to check if button really pressed