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The Automated Drink Dispenser. Andy James Brad Theophila Kyle Wilhelm. Overview. Automates drink making process Intended for bar tenders and home bar enthusiasts Graphical Computer Interface Customizable Drink Set. How It Works. 6 Bottle Carousel User specifies drink to be made

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The Automated Drink Dispenser

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The automated drink dispenser l.jpg

The Automated Drink Dispenser

Andy James

Brad Theophila

Kyle Wilhelm


Overview l.jpg

Overview

  • Automates drink making process

  • Intended for bar tenders and home bar enthusiasts

  • Graphical Computer Interface

  • Customizable Drink Set


How it works l.jpg

How It Works

  • 6 Bottle Carousel

  • User specifies drink to be made

  • Carousel rotates with gear and belt assembly driven by a stepper motor - 360° of rotation

  • Rotation controlled by detection through use of photo interrupters

  • Glass is pneumatically raised to push valves for dispensing


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Hardware Specifications

  • Stepper Motor

    • 7.5° per step

  • Photo Interrupters

  • Pneumatic Cylinder

    • 5 lbs of force required

    • At least 2” of extension required

  • Glass

    • 7 oz.


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Sensors/Actuators

  • Photo Interrupters

    • Two Interrupters

      • Outside Edge – calibration sensor – one detection hole

      • Inside Edge – bottle detection sensor – six detection holes

    • Detection disc attached to rotation gear

    • Sensors placed end to end at outside rim of detection disc


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Sensors/Actuators

  • Stepper Motor

    • Gear/belt driven assembly

    • Gear ratio used to adjust rotational sensitivity

      • Must use small degree steps to accurately align with valve (60° between bottles, @ 7.5° this is only eight steps between bottles)

      • Rotation should be fast but fluid

        • Fast enough to satisfy user

        • Fluid enough to prevent rotational stress of assembly


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Sensors/Actuators

  • Pneumatic Cylinder

    • Push cylinder with spring return placed at static position to line up with valves

    • Force needed measured to be 22 Newtons

      • Minimum of 5 lbs of driving force

      • Must not overly stress assembly by using large amounts of force

    • Depending on plate width, at least 1” extension

      • Overshoot extension to 2”, guarantee valve closure

      • Dampen excess extension using spring buffering

        • Can also control maximum force applied to valve

    • Motion needs to be quick without causing liquid to spill


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User Interface Features

  • Dispense Multi-shot Drinks

    • Predefined or Custom

  • Dispense Shots

  • Add/Remove Drinks from Menu

  • Add/Remove Known Ingredients

  • Define Bottle Contents


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Add Drink Interface


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Make Drink Interface


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Communications Specifications

  • Serial Communication

  • Custom Protocol

    • Messages sent to microcontroller

    • Acknowledgements sent back to PC, for every message sent


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Pseudo-Code for Drink Making Algorithm

1. Send “CHECK_COMM” message to HC12

2. Poll for “COMM_ESTAB” acknowledgement from HC12

-If timeout occurs, notify user that there is a communication problem

3. Send “CALIBRATE” message to HC12, in order to set carousel to its initial position

4. Poll for “CAL_FIN” ackknowledgment message from HC12


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Pseudo-Code for Drink Making Algorithm (Cont.)

5. Send “MOVE” message containing bottle to move to

6. Wait for “MOVED_TO” acknowledgement from HC12

7. Send “UNITS” message containing number of units to pour from current bottle

8. Wait for “BOTTLE_POURED” acknowledgment from HC12

9. Loop back to instruction 5 until all instructions have completed

10. Send “RECIPE_COMP” message to HC12

11. Wait for “COMP_ACK” message from HC12

-It would be possible for the user to initiate a bottle change at this point, or anytime after “COMM_ESTAB” is received, and no other instructions have been sent


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Message

Encoding

Description

MOVE+<Bottle Number>

Parameter Value Range:

1 to 6 (Corresponds to bottle number)

%00110000

or

$30

The POUR message instructs the HC12 as to which bottle to pour from. The software will expect a “MOVED_TO_BOTTLE” acknowledgment from the HC12 after this message is sent.

UNITS+<Number of Units of Liquid>

Parameter Value Range:

1 to 5 (Corresponds to a unit of liquid ~ ½ oz)

%01000000

or

$40

The UNITS message instructs the HC12 as to how many units of liquid to dispense from the current bottle. The software will expect a “BOTTLE_POURED” acknowledgment from the HC12 after this message is sent.

CHECK_COMM

%01010000

or

$50

The CHECK_COMM message is simply a message used to establish communication with the HC12. The software will be expecting an acknowledgment back from the HC12 after this message is sent.

RECIPE_FINISHED

%01011111

or

$5F

The RECIPE_FINISHED message informs the HC12 that the current recipe has completed, and all bottles have been poured from.

FREE

%01010001

or

$51

The FREE message informs the HC12 that it should “free” up the stepper motor controlling the bottle carousel, so that the user can spin it around, and change a bottle(s).

CALIBRATE

%01010010

or

$52

The CALIBRATE message is used to initiate a calibration sequence, for moving the carousel back to its starting position. This message will be sent after each FREE message, as well as upon startup of the system.

Messages from PC to HC12


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Message

Encoding

Description

MOVED_TO + <Bottle Number>

Parameter Value Range:

1 to 6 (Corresponds to bottle number)

%01100000

or

$60

The MOVED_TO_BOTTLE message informs the PC that the carousel has moved to the correct bottle, and the HC12 is waiting for the UNITS message from the PC.

BOTTLE_POURED

Parameter Value Range:

1 to 6 (Corresponds to number of units)

%01100001

or

$61

The BOTTLE_POURED message informs the PC that the current ingredient has been poured, how many units were poured, and also that the HC12 is waiting for another message.

COMM_ESTAB

%01110000

or

$70

The COMM_ESTAB message informs the PC that the HC12 is receiving messages, and is ready to start receiving drink instructions.

COMP_ACK

%01110001

or

$71

The COMP_ACK message informs the PC that the HC12 is aware that the current drink recipe has completed. The HC12 will then listen for the “CHECK_COMM” message from the PC.

CAL_FIN

%01110010

or

$72

The CAL_FIN message informs the PC that the HC12 has finished calibrating the carousel.

Messages from HC12 to PC


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Initialization

  • Microcontroller Startup

    • Jump to EEPROM

    • Listen for Communication from PC

  • PC Startup

    • Ping microcontroller until ready

    • Send Calibration Message


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Recovery

  • Microcontroller Recovery

    • PC will know

    • User will restart Microcontroller

  • PC Recovery

    • Microcontroller will finish current task


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Restrictions, Conditions, and Assumptions

  • Bottle Contents Provided

    • Must be reasonably accurate

  • Must use specified serial port (COMx)

  • Maximum Bottle Volume of 1L

  • Use only the provided glass


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Feasibility and Problems

  • Have Carousel

  • Possible Timing Issues

    • Dispensing

  • GUI

    • Must be simple and easy to use

    • Also must be powerful

  • Structural Integrity


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Testing Strategy

  • Start by testing individual components

    • Photo Interrupters, Motor, Pneumatic Cylinder

  • Test stand alone parts of the GUI

    • Drink and Ingredient Database

  • Test communication link between PC and HC12

  • Test control of hardware from HC12


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System Integration

  • Stages

    • Establish initial PC to microcontroller communication

    • Rotation Hardware

    • Dispensing Hardware

    • Finalize PC to Microcontroller Communications


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Questions?


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