diff --git a/sketches/max_sketch/LDR_Test_1/LDR_Test_1.ino b/sketches/max_sketch/LDR_Test_1/LDR_Test_1.ino
new file mode 100644
index 0000000..c5e956f
--- /dev/null
+++ b/sketches/max_sketch/LDR_Test_1/LDR_Test_1.ino
@@ -0,0 +1,21 @@
+#define IN3 (A3)
+int VAL3;
+int MAP3;
+int CONST;
+
+void setup() {
+Serial.begin(9600);
+}
+
+void loop() {
+VAL3=analogRead(IN3);
+Serial.print(VAL3);
+MAP3 = map(VAL3, 70, 500, 10, 1200);
+CONST = constrain(MAP3, 1, 1200);
+tone(11, CONST);
+Serial.print("\t");
+Serial.print(MAP3);
+Serial.print("\t");
+Serial.println(CONST);
+//delay(50);
+}