project 2 pasted in to repo

src/timer_usec.cpp

@@ -0,0 +1,14 @@
+#include "timer_usec.h"
+
+Timer_usec::Timer_usec() = default;
+
+void Timer_usec::init(uint16_t period_us) { // for custom duty cycle duration in ms in part 1
+    TCCR1A = 0;
+    TCCR1B = 0;
+    TCNT1 = 0;
+
+    OCR1A = period_us * 2 - 1;
+    TCCR1B |= (1<<WGM12);
+    TIMSK1 |= (1<<OCIE1A);
+    TCCR1B |= (1<<CS11);
+}