A bit delayed post. :D Apologies... Recently I received a few boards and accessories which was ordered previously through Ali Express. Don't mind if I say that AliExpress is one of the best marketing services for small electronics components. So, one among the boards was a PIR Relay Module which costs around ₹180 for me. In my house, I and my brother are the laziest and we don't use to turn off the lights once we leave the room. I wished I could install the board to the existing switch so as to make the lights automatic. Coming to the working principle of PIR Sensor, it usually consists of two special materials (Pyroelectric) which are sensitive to Infrared waves. When no change or motion occurs both the materials since the same amount of IR and stays idle. But as soon as there is a motion of a human or any changes which produces a difference in heat, the two material senses different variation. Consider it like this, when a person enters
Hi, This one is a rather simple Do it Yourself project. Recently, I found one of the dead mosquito bats in my room. The funny part being, there are a few of them here. One can certainly find that this piece of High Voltage equipment is one of those Chinese brains, in a sense that they use lower quality batteries, hence a much lower price of around ₹150 to ₹200. This itself was the obvious reason why I could find a bunch of them in my house. The problem, as you might have guessed, is the dead battery in the bat after a month or twice of use. As I was having my semester exams, I decided to repair the bat. :) The first thing I did was to open up the bat and undoing all the screws and collecting them aside. After which, on a close examination, I found that the battery used was of such cheap quality. I used my beloved multimeter and checked the voltage of the battery which showcased a voltage of 4.1v. I assumed that the circuit works within a voltage range