Create README.md

Author: pramodkumar17521

README.md

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+# Arduino-DTMF-Lock
+As we all know that we can control or automate things using our mobile keypad through DTMF Module.
+So I designed a lock system which can locked and unlocked using a password entered through our mobile after connecting it to the module.
+DTMF receives the key value pressed on mobile as a input in its four digital input pins which generates value in binary.
+eg. If I press 1 on mobile then I receive 0 0 0 1 as four inputs in DTMF input pins.
+The main problem with DTMF is that until I press a new key, it continuously reads or repeats previous key input.
+means if previously I pressed 1 then it continuously shows 0 0 0 1 as input or sensing value until we press another key.
+This continuous flow was the main problem in making password based lock.
+I tried to break this continuous flow by using some programming techniques.
+
+***************************************************HOW TO USE*****************************************************
+I impleaments the code for 4 digit long password but you can increase its length according to your need.
+Attention: 
+- Before start entering password you have press #.
+- Then enter your 4 digits password.
+- Then press * at the end.
+
+**********************************************************************************************************************
+
+This # indicates that I am start entering my password 
+and * indicates that I successfully entered my password.
+this indications helps in dealing with continuous flow inputs.