first commit

libraries/TinySuite/examples/external-interrupt/main.cpp

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+#include <avr/interrupt.h>
+#include <TinyExternalInterrupt0.h>
+#include <TinySleep.h>
+
+void onInterrupt() {
+    // wakeup and do something
+}
+
+int main()
+{
+    sei();
+    // interrupt when INT0 (pin 7) has LOW level (RISING or FALLING do not wake up from deep sleep)
+    ExternalInterrupt0.on(LOW, onInterrupt);
+    while (1) {
+        deepSleep();
+    }
+    return 0;
+}