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Matemat
The Matemat is a vending machine for carbonated soft drinks.
It is based on an old vending machine with all its electronics replaced by new custom-build circuit boards.
All hardware and software was designed by members of (CCC Basel)[http://www.ccc-basel.ch] and released in the form of circuit diagrams, printed circuit board layouts and source code for anyone to use and modify. Refer to the LICENSE file for details.
The name "Matemat" is a portmanteau of "mate" (as in mate tea) and "automat" (the German word for vending machine). The device is mainly intended to dispense mate tea based soft drinks, but may be used for other types of beverages too.
Structure
The heart of the vending machine is a Raspberry Pi model 3 or later, witch a custom CAN interface board on its GPIO header.
See (CAN Hat)[https://github.com/onitake/canhat] for more information.
Modules
The Matemat components are highly modular. Individual circuits are connected by CAN bus, and can be extended as needed.
drive
Single-motor driver.
Attached directly to each bottle release mechanism. Requires only power supply wires for the motor and the CAN bus line.
power
Motor driver board and power supply.
Alternative to the drive board. Uses the existing machine wiring instead of power + CAN.
control
Old central control board. Obsolete.
feedback
End switch feedback interface.
Senses the status of the end switches and sends CAN bus messages on changes.
poweriface
Interface between CAN bus and power board.
sensor
Environment sensor interface.
wiring
Wring schema of the old vending machine.