How to make selfie button for smart phone using audio jack

Here is a simple method to make a quick or short cut hardware button to take selfie. It use the audio socket and the index finger can be used to click the shutter. If we short the mic and ground pin mobile phone app can detect it as a shutter press and does the necessary action. In google play store search for “selfie stick app” , you will find multiple free app like coolplay camera for monopod.