diff --git a/notes/esp32_serial/esp32_serial.ino b/notes/esp32_serial/esp32_serial.ino
new file mode 100644
index 0000000..af99b6b
--- /dev/null
+++ b/notes/esp32_serial/esp32_serial.ino
@@ -0,0 +1,22 @@
+
+#include <Arduino.h>
+
+#define RXD2 16
+#define TXD2 -1
+
+HardwareSerial Serial2(1);
+
+
+void setup () {
+    Serial2.begin(57600, SERIAL_8N1, RXD2, TXD2);
+}
+
+
+
+void loop () {
+    now = millis();
+
+    if (Serial2.available() > 0) {
+        //cmdChar = Serial2.read();
+    }
+}