diff --git a/Audio_Input_Tester.ino b/Audio_Input_Tester.ino
new file mode 100644
index 0000000..5c3adc8
--- /dev/null
+++ b/Audio_Input_Tester.ino
@@ -0,0 +1,11 @@
+void setup() {
+  Serial.begin(256000);
+}
+
+void loop() {
+  // If using an electret microphone unit, then it needs adjusting
+  // Select the Tools/Serial Plotter and use the display as an oscilloscope
+  // Don't forget to select the correct speed! 256000
+  // Connect audio to A0 or VP or VN
+  Serial.println(analogRead(A0));
+}