diff --git a/arduino/SerialEcho/Makefile b/arduino/SerialEcho/Makefile
new file mode 120000
index 0000000..51c7f30
--- /dev/null
+++ b/arduino/SerialEcho/Makefile
@@ -0,0 +1 @@
+../arduino.mk
\ No newline at end of file
diff --git a/arduino/SerialEcho/SerialEcho.ino b/arduino/SerialEcho/SerialEcho.ino
new file mode 100644
index 0000000..5565d20
--- /dev/null
+++ b/arduino/SerialEcho/SerialEcho.ino
@@ -0,0 +1,13 @@
+const unsigned int BAUD_RATE = 9600;
+
+void setup() {
+  Serial.begin(BAUD_RATE);
+}
+
+void loop() {
+  if (Serial.available() <= 0) {
+    return;
+  }
+
+  Serial.write(Serial.read());
+}