MateDealer is an open source implementation of a MDB cashless device. It runs on a Arduino Mega2560 and probably on other Arduinos/ATMEL micro processors. Its written in c and not in the Arduino c++ dialect.
For more information, see the website at: https://256.makerslocal.org/wiki/Soda_Machine/Cashless_Device
For bugs, contributions, suggestions, or anything else send an E-Mail to: hunterf@makerslocal.org
Special thanks to Reaktor23 for the initial project: https://reaktor23.org/de/projects/mate_dealer