commit 4908c9a7a038ab4e9ba5e61319ffec74fac5cdee
Author: wancat <wancat@wancat.cc>
Date:   Wed Mar 2 10:04:12 2022 +0800

    跑馬燈

diff --git a/helloworld/helloworld.ino b/helloworld/helloworld.ino
new file mode 100644
index 0000000..72a30eb
--- /dev/null
+++ b/helloworld/helloworld.ino
@@ -0,0 +1,21 @@
+int LED[] = {5, 6, 9, 10, 11};
+int val[5] = {250, 150, 0, 150, 250};
+int clk = 0;
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  for (int i = 0; i < 5; i++) {
+    pinMode(LED[i], OUTPUT);
+    digitalWrite(LED[i], HIGH);
+  }
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  for (int i = 0; i < 5; i++) {
+    analogWrite(LED[i], val[(i + clk) % 5]);
+  }
+  clk += 1;
+  delay(200);
+}