What is this? This is a device which will detect the organic living organisms when it is come in contact. It will send the signal in the form of electric current. If the organism is big enough, then the amount of current as a signal will found out the size of the organism. If the size of the organism is very big like an elephant then the amount of current will be very high. Oh…… this is a task to do. Let’s talk about how it actually works.How it works? I usually make very easy circuits for you so that very weak student in electric current can also be able to understand it and make it. So here it goes…..It only works with 2 transistors, both PNP and NPN. Just you should have two transistors and by connecting it in the particular pattern and then you will be ready with that.