Making some arduino-shaped messes

.gitignore

@@ -6,3 +6,4 @@
 **/target/
 /hello_world/main
 /aoc*/**/input
+/arduino/build-*/

arduino/.envrc

@@ -0,0 +1,2 @@
+export ARDMK_DIR=/usr/share/arduino
+export ARDMK_VENDOR=archlinux-arduino

arduino/Makefile

@@ -0,0 +1,3 @@
+BOARD_TAG    = uno
+
+include $(ARDMK_DIR)/Arduino.mk

arduino/sos.ino

@@ -0,0 +1,31 @@
+#define DIT_DURATION_MS 88
+#define LETTER_PAUSE_MS 1000
+
+void setup() {
+	pinMode(13, OUTPUT);
+}
+
+void dit() {
+	digitalWrite(13, HIGH);
+	delay(DIT_DURATION_MS);
+	digitalWrite(13, LOW);
+	delay(DIT_DURATION_MS);
+}
+
+void dah() {
+	digitalWrite(13, HIGH);
+	delay(DIT_DURATION_MS * 3);
+	digitalWrite(13, LOW);
+	delay(DIT_DURATION_MS);
+}
+
+void loop() {
+	dit(); dit(); dit();
+	delay(LETTER_PAUSE_MS);
+
+	dah();
+	delay(LETTER_PAUSE_MS);
+
+	dit(); dit(); dit();
+	delay(LETTER_PAUSE_MS);
+}