added example for controlling a traffic light

src/main.cpp

@@ -4,11 +4,13 @@ extern void loop();
 
 //#include "blink/blink.h"
 //#include "button_poll/button.h"
-#include "button_interupt/button.h"
+//#include "button_interupt/button.h"
+#include "trafficlight/trafficlight.h"
 
 //#define BLINK
 //#define BUTTON_POLL
-#define BUTTON_INTERRUPT
+//#define BUTTON_INTERRUPT
+#define TRAFFIC_LIGHT
 
 int main() {
     init();

src/trafficlight/trafficlight.cpp

@@ -0,0 +1,34 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#include "trafficlight.h"
+
+#ifdef TRAFFIC_LIGHT
+
+void init() {
+    // set Port B bit 0,1,2 to output mode
+    DDRB = 0b00000111;
+
+    // set port B bit 2 (red) to one
+    PORTB = 0b00000100;
+}
+
+void loop() {
+    _delay_ms(200);
+    // set red orange
+    PORTB ^= 0b00000010;
+    _delay_ms(200);
+
+    // set green
+    PORTB ^= 0b00000111;
+    _delay_ms(500);
+
+    // set orange
+    PORTB ^= 0b00000011;
+    _delay_ms(500);
+
+    // set to red
+    PORTB ^= 0b00000110;
+}
+#endif

src/trafficlight/trafficlight.h

@@ -0,0 +1,13 @@
+//
+// Created by servostar on 27.10.23.
+//
+
+#ifndef ARDUINO_TRAFFICLIGHT_H
+#define ARDUINO_TRAFFICLIGHT_H
+
+#include "prelude.h"
+
+void init();
+void loop();
+
+#endif //ARDUINO_TRAFFICLIGHT_H