Hello sir,
i'm embedded systems engineer, i already worked on complex electronic systems like sine wave inverter, DC/DC converter, interfaces to manage actuators, RS232 interface.
i see that you need to make interface to process the barcode of the inserted coin, i will be happy if you share with me more details on the project, like what the card should do,
i'm looking forward to work with you, i can share with you some of my previous works if you would like, and i can work on some prototype
cordially,