Eddy current test (ECT) is one of the techniques for accurate testing as well as widely used in the aircraft and nuclear industry. Changes in thickness due to corrosion will affect the measurement of defects on pipes or plates. This will make an irrelevant decision as to whether the defect that occurs on the work piece is the thickness of the paint or corrosion. This problem can lead to the occurrence of leaking pipes, apart from the deterioration of the company’s productivity and most importantly endangering the safety of employees. Meanwhile, eddy current testing is one of the methods in NDT used to detect cracks or corrosion on the surface of carbon steel. In this work, GMR Eddy Current sensor is used to measure the corrosion on carbon steel pipes, and a permanent magnet is used to generate the magnetic field for corrosion detection. Also, this system is configured with an IoT Unmanned Aerial Vehicles (UAV) drone platform to facilitate access at different heights during the inspection process. The change of voltage amplitude at the GMR sensor on the test material proves the conditioning of the material either normal or corrosive. The result shows that when corrosion occurs on the pipe, the voltage amplitude increases up to 0.5% higher than normal. Finally, the metal loss is higher when the corrosion area is larger and at the same time it is directly proportional to the voltage amplitude

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Sudden fluctuation in voltage may cause a serious problem in industries and home appliances. These fluctuations may significantly impact the power quality as well as the reliability of other voltage controlling devices. However, this paper discussed about designing for under voltage and over voltage protection to protect and extend the lifespan of home, office and industrial equipments. The AC voltage sensor module ZMPT101B is used in detecting a voltage of -6% of the rated voltage and it is recognized as under voltage while 10% of the rated voltage is recognized as upper voltage. The rated voltage of single phase is normally supply 230 V. Moreover, the sensor is attached with ESP 8266 WiFi platform so that the user can observe the voltage condition through Blynk application. As a conclusion, the combination of voltage protection system through Internet of Thing (IoT) device may contribute to the user.

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