diff --git a/sketch_may21a/sketch_may21a.ino b/sketch_may21a/sketch_may21a.ino
new file mode 100644
index 0000000..1bcba1c
--- /dev/null
+++ b/sketch_may21a/sketch_may21a.ino
@@ -0,0 +1,30 @@
+const int requestEnterPin = 36;
+const int openDoorPin = 32;
+int requestvalue;
+
+// setup code runs once:
+void setup() {
+  pinMode(requestEnterPin, INPUT);
+  pinMode(openDoorPin, OUTPUT);
+}
+
+void openDoor() {
+  analogWrite(openDoorPin, 255);
+}
+
+bool askToOpen() {
+  requestvalue = analogRead(requestEnterPin);
+  if ( requestvalue > 100 ) {
+  	return true;
+  } else {
+  	return false;
+  }
+}
+
+// main code runs repeatedly:
+void loop() {
+  if ( askToOpen() ) {
+  	openDoor();
+  }
+  delay(1);
+}