Upgraded Coin-Operated Prepaid Loading Station

The system is an extension of the Coin Operated Mobile Phone Loading Station (Gabutin & Arenas, 2018). The Upgraded Coin-operated Prepaid Loading Station developed and designed by the proponents consists of features that could help users easily understand the whole loading process. The system uses a serial communication in sending and receiving data from the sorter and dispenser system. The coin sorter and dispenser system is responsible for accepting old and new 1.00, 5.00, and 10.00 pesn coins. It can also be used in dispensing the change of the customer. The system can transmit load to an active prepaid users. The keypad is used to input the necessary load details (phone number and load credits) of the customer. The LCD simultaneously displays the details inputted by the customer.
All successful loading transaction is saved as a file in the micro SD card. A successful loading is achieved when the system received the load confirmation from the service provider. The GSM Module makes the loading processpossible to all well- known mobile service providers in the locality. The system sends an alert message to the operator when the system's load balance reaches the set minimum value. The system informs the customer of the remaining load wallet in the sim and prompts a warning in the LCD when the system is unable to send load to the customer. The system uses ATMEGA microcontroller embedded in the Arduino Mega 2560 that serves as the brain of the system. The Arduino IDE is the platform used in integrating all the codes and programs of the system. There were no problems encountered during the testing. Often times, the loading process will take some time depending on the availability of the signal.