Tom's Vending Machine

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General

Owner/Loaner: LVL1 Serial Number: none visible Make/Model: unknown Arrival Date: prior to Dec2010 Usability: no Contact: Jared Where:

Brad has built some custom boards with PCA9554N I/O Port chips on them. There is an input board, with 22 screw terminals to be connected to any buttons on the device, an output board, with 22 relays to trigger the motors to vend products, and a rPi to handle i2c protocol between the PCA9554N chips. Provisions will be made to make the coin acceptor a functional device, so that the rPi can know the denomination of coin inserted, and whether or not the user has taken a refund. -Jared

To Do

• Figure out what kind of power the motors need, and how long the relays need to be open to trigger one and only one complete rotation, to vend only one product.
• Build a coin chute/acceptor device that can differentiate between different denominations of coin.