example code added

example.txt

+// measure frequency of the in or out pin in reference to ground
+// bridge the in and out pin using a jumper to allow for the transfer of information
+
+const int in = 0;
+const int out = 1;
+
+void setup() {
+  pinMode(in, INPUT);
+  pinMode(out, OUTPUT); 
+  digitalWrite(out, LOW);
+}
+
+void loop() {
+  digitalWrite(out, 1 - digitalRead(in));
+}
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