An accurate circuit idea for pre-paid electricity for portable devices

Abstract

In this paper, we describe a circuit idea and implementation algorithm of a device useful to common people during travelling. This device provides the power to user by inserting a one rupee coin. It consists of a coin detector, microcontroller and out driver relay. When a coin is inserted, power can be drawn from the plug point for a predefined duration. This devise is useful for charging all portable electronic devices and e-vehicles.