RFID Prepaid Card Machine
Using MiFARE RFID NFC Cards to store prepaid credit information.
This is a device to write, add and substract credit information on a MiFARE card to use for prepaid systems. You may change access keys of MiFARE card to add security.
I have used a YwRobot breadboard power supply to power 5V and 3.3V Inputs.
Connect ribbon jumper cables straigt between devices and male headers. Headers on board are arranged in same order of corresponding device's pins.