Intelligent Vending Machine

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Intelligent Vending Machine
Team VENDetta

• Jeffrey Hepworth
• Erik Mauer
• Brendan Murphy
• David Rodriguez

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Project Overview

• Retrofit standard vending machine with
• New interactive features
• Energy saving technology

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Project Status

• Control Board still in development
• Still learning peripherals on DE2 board
• Basic selection menu running on LCD
• Motor system design implemented
• Using MSP430 for motor driving as well as sensors
• MDB board running
• Detects coins and bills inserted
• Electronic payment
• Hardware designed
• Prototype circuit finished

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New System Diagram
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ALTERA Cyclone II FPGA

• FPGA State Machine
• Interface
• MDB (Multi-Drop Bus)
• Coin/Cash Payments
• LCD
• E-Payment
• NIOS II Soft-core
• Electronic Payment Software
• MDB Software
• Host Interface Software

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NIOS II Schematic
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LCD Interface

• LCD uses 40 GPIOs on the FPGA
• Touch Screen ADC serial signal (5 lines)
• LCD Control Signals (4 lines)
• Synchronous timing signals and RGB data (28
  lines)
• Power and Ground (3 lines)

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LCD Control
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LCD Touch Screen
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Cash Interface

• MDB2PC board donated by Upstate Networks
• MDB2PC sends ASCII via RS232
• Upon insertion of bills or coins, board sends a
  unique HEX value
• HEX value corresponds to what type of coin or
  bill was inserted
• Power consumption
• Requires 24V _at_ 6A (max)

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Electronic Payment Upgrades

• Magnetic Card Reader
• Reads any magnetic card
• Reads one to three tracks
• Outputs standard RS232
• 9600 Baud, No Flow control
• Needs separate power supply
• DE2 doesnt provide power on RS232 port
• 3 mA power requirement
• Inject power into RTS line
• MAX3232 used to convert from RS232 to 3.3V
  TTL

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Timing Diagram of Magnetic Card Reader
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RFID

• 5V TTL logic out
• LV4245 Level shifter used to convert from 5V to
  3.3V TTL
• 30 mA power requirement
• 9600 baud rate
• 10 cm read range
• 64 bit tag number
• Standard ASCII output

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Electronic Payment Schematic
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Host Interface

• Use Visual Basic Application
• Allow for owner/servicemen to monitor and control
  machine
• Check Inventory
• Check Sales and profit
• RS232 for development
• Use dedicated Ethernet LAN for final
  implementation

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MSP430

• Interface between motors, sensors, and lighting
• Why MSP430?
• Built in peripherals
• Number of I/O ports
• Allows us to operate separate processes from the
  Altera board
• Familiarity

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Interface between MSP430 and Altera

• Altera MSP430
• Altera sends a 7-bit signal for motor driving
• 6 bits allocated for motor selection
• 1 bit for initiating vend cycle
• 1-bit action signal to alert the MSP of user
  interaction
• MSP430 Altera
• 3-bit error signal
• 3-bit status signal

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MSP430
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Motor Software
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Motor Hardware Matrix
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Motor Schematic
UDN2982A (Source Driver)
UDN2559B (Sink Driver)
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Sensor Software Implementation
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RF DisturbanceCrime Guard AU94T

• Donated by Erik
• 2 stage radar motion sensor
• Uses 12V
• Notify MSP430 of customer presence
• Sends -200mA when activated

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VeriVend PIR Sensor

• Will be use to verify vend has been successful
• Infrared-sensitive element
• I/O pin to communicate with MSP430
• Benefits
• Uses 3.3V
• Small
• Three pin connection
• Single bit output

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TEMP LM34 Precision Fahrenheit Temperature Sensor

• Calibrated directly in degrees Fahrenheit
• Temperature range of -50 to 300
• Better than 1.0F accuracy
• Operates from 5 to 30 volts DC
• Less than 90 µA current drain
• Low cost

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Lighting

• Fluorescent Lighting
• 14 W in Snack Side
• 30 W in Soft Drink Side
• Custom high efficient lighting
• Estimated 50 savings
• Work in Progress

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Power

• MDB to RS232 board (MDB2PC)
• 24-36V _at_ 6A
• Drives coin/bill acceptors
• Motors
• 24V _at_ 500mA
• Altera FPGA board
• 9V _at_ 1.3A
• Sensors
• 5V and 12V

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Updated Budget Updated Budget Updated Budget Updated Budget
Item Predicted Price Actual Purchases to Date
MDB2PC Donated Donated
LCD 206.00 206.00
Magnetic Card Reader 70.00 59.95
Altera Breakout Board 80.00 79.95
Power Supply 40.00 14.00
PCB 200.00
Sensors 30.00
Remote Interface 100.00
Shipping 100.00 14.00
RFID 55.00 34.85
Misc. Parts 123.00 41.34


Total 1,004 450.09
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Labor Distribution Labor Distribution Labor Distribution Labor Distribution Labor Distribution
Jeff Brendan Erik David
LCD X X
MDB X X
Control Board X X
Host Interface X X
E Payment X X X
Sensors X X
PCB X X
Power Supplies X X
Lighting X
Pricing Display X X
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Schedule
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Milestones

• Milestone 1
• LCD Operational
• Sensors Implemented
• MDB Implemented
• E payment running
• Milestone 2
• Lighting Implemented
• Remote Interface Implemented
• Control Board PCB completed
• Expo
• Complete vend control from LCD
• Remote Interface
• LED Price Display (possibly)

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Roadblocks

• MDB
• Graphics/ LCD
• Timing
• Depth of menu detail / dynamic displays
• Altera
• NIOS
• FPGA
• MSP430/Altera Communication

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Questions ???