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Audio_Input_Tester.ino

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+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));
+}