For economic reasons in many countries, the most widely used and well-liked fuel source for cooking is LPG (Liquefied Petroleum Gas). It is also preferred for its convenience on usage among the users. In this paper, we discuss about the smart booking system which will be used for booking the new LPG cylinder by automated process of continuous monitoring the LPG cylinder, measuring the content level of gas in cylinder and displaying the gas content level in LPG gas cylinder (house-hold) on its usage by the customers. The content level of LPG in cylinder is not examined normally and hence in the proposed smart booking system, the content level of LPG in cylinders is displayed. Here, a load sensor is used to measure the level (minimum load) of LPG in cylinder and the sensor output is connected with a Node mcu esp8266. By the use of GSM (Global System for Mobile communications) module, the information regarding to refill the cylinder is passed to the user through SMS (Short Messaging Service), and thereby completing the automatic (smart) booking of cylinder by sending message to the booking number of gas that the user had registered with. By this process, the detection of gas level in LPG cylinder is done continuously and displayed via LCD, thereby indicating the usage of gas by the customer from the date of delivery of cylinder to the customer. When the gas content level in cylinder is below the minimum load (below 20%), then the user mobile is alerted through a proper message as a part of IOT. Hence, automatic (smart) booking of latest LPG is done by sending message to LPG booking office and thereby preventing late booking.

Keywords: Arduino Uno, GSM module, lawful candidate, Liquefied Petroleum Gas, Load Cell Sensor, minimum load, Smart Booking System.