diff --git a/src/blink/build/main.elf b/src/blink/build/main.elf
index c4228ad..a2f9ad4 100755
Binary files a/src/blink/build/main.elf and b/src/blink/build/main.elf differ
diff --git a/src/blink/build/main.hex b/src/blink/build/main.hex
index 8eb03e3..07c7e1a 100644
--- a/src/blink/build/main.hex
+++ b/src/blink/build/main.hex
@@ -5,6 +5,210 @@
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diff --git a/src/blink/main.c b/src/blink/main.c
index b2f1b90..bd3b0a6 100644
--- a/src/blink/main.c
+++ b/src/blink/main.c
@@ -1,8 +1,39 @@
-#define F_CPU 16000000UL // CPU Frequency
+#define F_CPU 16000000UL
 #include <avr/io.h>
 #include <util/delay.h>
 
-int main(void) {
-  while (1) {
-  }
+
+int main(void)
+{
+   DDRB = 0xff;
+
+    while (1) 
+    {
+        // green
+        PORTB |= (1<<PORTB5);
+        _delay_ms(500);
+        PORTB &= ~(1<<PORTB5);
+        _delay_ms(500);
+
+        // yellow
+        PORTB |= (1<<PORTB4);
+        _delay_ms(500);
+        PORTB &= ~(1<<PORTB4);
+        _delay_ms(500);
+
+        // red
+        PORTB |= (1<<PORTB3);
+        _delay_ms(500);
+        PORTB &= ~(1<<PORTB3);
+        _delay_ms(500);
+
+
+        // red
+        PORTB |= (1<<PORTB3);
+        PORTB |= (1<<PORTB4);
+        _delay_ms(500);
+        PORTB &= ~(1<<PORTB3);
+        PORTB &= ~(1<<PORTB4);
+        _delay_ms(500);
+    }
 }