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The VEMIO Product series provides USB connected IO interfaces which can be ideally used to build vending machines with hosts like Raspberry Pi, Intel NUC and other standard computers.
The devices use a virtual USB Serial connection and an ASCII protocol (line based) so they are very easy to use and control from a host.
VEMIO 1 and VEMIO 2 provide functions like:
Keypad simulator (VEMIO 1)
Matrix drivers (high and low side drivers for 12V or 24V systems)
Current detection
Control signal scanning
Temperature monitoring (VEMIO 2)
Analog Input Reading (VEMIO 1)