American Journal of Engineering Research (AJER) 2017 American Journal of Engineering Research (AJER) e-ISSN: 2320-0847 p-ISSN : 2320-0936 Volume-6, Issue-8, pp-331-337 www.ajer.org Research Paper Open Access www.ajer.org Page 331 Design of a Supervisory Control and Data Acquisition System for Monitoring Temperature and Light Intensity of a Workstation * Okwudibe Darlington Chinenye 1 , Oboshnure Kingsley 1 1 Information and Communication Technology Centre, Niger Delta University Wilberforce Island Bayelsa State. Corresponding Author: Okwudibe Darlington Chinenye Abstract: In this Project the design of a Supervisor Control and Data Acquisition (SCADA) system to monitor temperature and light intensity and voltage regulation was carried out. The system when implemented had the ability to control the environmental temperature and ambient light intensity of a workstation and transmit the data of these controlled parameters, wirelessly, between the site and base station. The base station was designed with an LCD display that would enable the user to view these parameters and also have input keypads that the user can use to alter the light intensity and temperature wirelessly. The system carries the voltage regulation on a fan and incandescent bulb as loads. To achieve this feat, an embedded system was used which involves the programming of a PIC microcontroller using assembly language. Other discreet components were also utilized such as resistor, capacitor and transistors. The wireless communication system used is radio frequency. This is possible because RF transceivers were mounted on the site base station. After the design, construction and testing, the project was able to function satisfactorily, as the SCADA system could alter environmental temperature and ambient light intensity of a site and transmit the information wirelessly to the base station from 10 o C to 100 o C and 1% to 100% light intensity and vice versa in reduction mode. Keywords: SCADA, sensors, Micro Controllers, temperature, transceivers --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 17-08-2017 Date of acceptance: 31-08-2017 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION SCADA system is an acronym for Supervisory Control and Data Acquisition system. It is basically a system for remote monitoring and control that operates with coded signals over communication channels [1]. The system may be combined with a data acquisition system by adding the coded signals over communication channels to acquire information about the status of the remote equipment for display or for recorded functions. It is a type of industrial control system [1]. Typically, SCADA systems are used to automate complex industrial processes where human control is impractical, systems where there are more control factors, and more fast- moving control factors, than humans can comfortably manage. [2]. Control according to [3-4] consists of monitoring the state of a critical parameter, detecting when it varies from the desired state, and taking action to restore it. Control can be discrete or analog, manual or automatic, and periodic or continuous. It is impossible to keep control and supervision on all industrial activities manually, hence some automated tool is required which can control, supervise, collect data, analyze data and generate reports[1]. In control processes where by environmental conditions are desired to be set, conditions such as the temperature, light intensity, pressure, humidity, environments conditional altering equipment would be employed.This is sometimes referred to as a secondary control process because it involves the use of a device or process to control another process. For instance, in the temperature regulation of an environment, the use of an air- condition unit or a simple domestic fan would be employed. In all the above mentioned control process, the acquisition of data becomes necessary. Personnel would need to know the status of a particular machine to ensure that the total process would not be flawed. According to [5] processes usually employ handshake ability in its structure. Which means that the synchronous working of all machines and equipment in the total process is extremely important for the process to be successful. The accumulated data from the controlled parameters could be analyzed, stored or just displayed on a screen [6]. SCADA systems around the world, find use in a wide variety of applications, electric power generation, transmission and distribution. Electric utilities use SCADA systems to detect current flow and line voltage [6] and [7] to monitor the operation of circuit breakers, and to take sections of the power grid online or