Design And Construction Of A 555 Timer IC Based Detonator:- Anozie, Ifeanyi E

ABSTRACT

This project, 555 Timer IC Based Detonator, is intended to use the switching mechanism of the 555 timer IC to established time variants for the triggering and blasting of a suitably used material, gunpowder. It makes use of the monostable mode of connection or wiring of the 555 timer to establish this. Different stages of triggring of the material is provided, and each goes through a relay switch that closes its terminal to send high current to a short-circuited piece of nichrome material - a wire. At the establishment of a short the nichrome glows at red hot immediately. This heat is strong enough to ignite the gunpoweder and start of the spontaneous chemical reaction that gives off visible light and loud explosion. To incorporate some protective measure against illicit or third party hacking, these triggering have been employed: 555 timer primary detonation, which is the normal operation ofthe IC, Light-exposure detonation, which is possible through the use of a light sensor that quickly allows huge current to pass through it when light is incident on it, Wrong defusing detonation, which is a technique that when a wrong wire is cut in attempt to disarm the setup the detonator triggers an explosion, Emergency detonation, which is used directly, bypassing the other triggering techniques.