International Journal of Robotics and Automation (IJRA) Vol.9, No.4, December 2020, pp. 292~299 ISSN: 2089-4856, DOI: 10.11591/ijra.v9i4.pp292-299  292 Journal homepage: http://ijra.iaescore.com Design of a conductive material detection system Freddy Artadima Silaban, Setiyo Budiyanto, Lukman Medriavin Silalahi Department of Electrical Engineering, Universitas Mercu Buana, Indonesia Article Info ABSTRACT Article history: Received Jun 30, 2020 Revised Sep 13, 2020 Accepted Sep 22, 2020 The development of technology and industry development in the 4.0 era is very fast along with these developments in the control of production results such as medicine, food, and safety must be faster and more accurate. To face free trade and global economic competition, every company is required to produce products that have good quality by the standards. By using an experimental method which is the development of this study aims to make a conductive material detector (metal detector) for the pharmaceutical industry, the food industry, and security as compared to using conductive material sensors that are integrated with the Arduino microcontroller. Application testing is carried out to find out whether the Blynk application on an android smartphone with Blynk on a Debian server that has been made previously runs well or not and the alarm system testing uses a buzzer and LED to detect conductive material passing through. Conductive sensor test results showed that the instrument can detect 6 conductivity materials such as stainless steel, aluminum, steel, zinc, copper, and tin. The average response time to detect conductive material is 3 seconds, the average ADC value of the conductive material is 0.55. The test results also successfully send information and data to the Blynk application so that it can be monitored online. Keywords: ADC Arduino Blynk Server Conductive material ESP8266 This is an open access article under the CC BY-SA license. Corresponding Author: Freddy Artadima Silaban, Department of Electrical Engineering, Universitas Mercu Buana, Meruya Selatan, Kembangan, Jakarta Barat 11650, Indonesia. Email: freddy.artadima@mercubuana.ac.id 1. INTRODUCTION Supervision in various fields requires a supporter who can do what cannot be done by humans, for example, in the fields of health, product quality, and safety. Health is an important thing that concerns the community. Medication becomes one of the important needs to maintain health and treat all diseases. One indicator in measuring the quality of medicines is to be free from conductive materials such as metals. If the drug contains metal, the health of the users deteriorates and the drug industry experiences a decline in consumers and decreases in company profits [1-5]. The quality of other products that must be considered such as food products such as ready-to-eat products, baby food, and other foods. Conductive material detection sensors are used for security such as in aircraft airports where before entering aircraft all objects that are attached or not attached to the human body must be removed if not removed then detected by the sensor [6-10]. In the world of the pharmaceutical industry and the food industry, several products are contaminated by conductive materials, either magnetic or non-magnetic. This is due to contamination from conductive materials (material contamination, mixing process errors, and machine failures) [11, 12] and the use of various equipment in the production process which is mostly made of conductive material. Detection of conductive material contamination in drugs and food is very important and requires high accuracy, thus