I have got a PIR sensor (https://www.amazon.in/xcluma-HC-SR501-Adjust-Infrared-Motion) <<this one.I just want to know how to detect hand gesture eg-wave of my hands.There are some gesture sensors which are quite expensive and they also have a short range of about 10cm . While PIR sensors have a range of 20 feet or something.So can anyone help out I am working on this project.
I just want to know how to detect hand gesture eg-wave of my hands.
You cannot. A PIR sensor just detects if there is a change in the temperature in one of it's measurement sectors. The resolution is by far not high enough to detect any gesture. What you are looking for is a device like the Microsoft Kinect.