wip:

.gitignore

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+.vscode
+.DS_Store
+build

src/main.c

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+#include "avr/io.h"
+#include "avr/sleep.h"
+#include "avr/fuse.h"
+
+FUSES = {0xE2, 0xDF, 0xFF};
+
+int main(void)
+{
+	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+	sleep_enable();
+	sleep_cpu();
+	return 0;
+}