Hostel Power Switching Card System

In this world, it consists of a lot of people who do not know how to use power wisely. For example, especially in hostel areas, the students will keep turning on the phone or laptop charger and keep turning on the air-conditioner to keep their room at their desired temperature even when there is nobody in their room. This is a big issue, and it will cause the students to pay high electrical fees and cause the wastage of natural resources. To overcome this problem, the hostel power switching card system is implemented. In the hostel power switching card system, the students need to insert the student ID card into the energy-saving card switch to turn on the power. Without the card, the student will not be able to turn on the power of their room. After inserting the card, the power will turn on immediately and the energy meter will start measuring the unit consumption. The energy meter will transfer the data to the ESP12E NodeMcu V3, which is the microcontroller in this system, via an optocoupler. The optocoupler will measure the pulses from the energy meter. The ESP12E NodeMcu V3 will upload the data to the Blynk cloud. The students can check the unit consumption and electrical fees used through the Blynk mobile application.