Consider a system where a sensor is connected to a post beside a railway line. Whenever a train passes through the post the sensor generates a HIGH pulse signal. That signal then adjusted and passed to a 555 Timer IC. As soon as the 555 timer IC’s input gets the signal, a HIGH output pulse is generated in the output of that IC and closes the Railway gate for 3 minutes.

A system needs to be designed using a 555 timer IC that will work as same as mentioned in the above situation. Consider the external Resistor (R) and Capacitor (C) value as required.

(i) What will be the mode operation of the 555 timer IC for the system?

(ii) Draw the figure of the system and analyze the required external Resistor (R) and Capacitor (C) value.