EEL 4924 Electrical Engineering Design (Senior Design) Final Design Report

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1 EEL 4924 Electrical Engineering Design (Senior Design) Final Design Report April 25, 2012 Project Title: Smart Fridge Team Members: Seth Goldberg & Kelly McEachern Project Abstract: Our project is a smart refrigerator module capable of keeping track of its barcode bearing contents. The user will be able to switch between two modes: one to scan in items when placing them into the refrigerator, and the other to scan them out after finishing them, thus creating an up to date inventory. The inventory of the fridge will be kept on a website that can be accessed on any browser capable of reading HTML, including smart phones. The barcode scanner output will be processed by an Atmel microcontroller and this will be used to look for the corresponding entry in the barcode database located on the internet.

2 Final Design Report: Smart Fridge Table of Contents: Project Abstract 1 List of Tables and Figures 3 Introduction 4 Project Objectives 5 Technical Objectives 6 Project Features 7 Software Flowchart 7 Concept Selection 8 Technology Selection 8 Division of Labor 8 Bill of Materials 9 Gantt Chart 9 2

3 Final Design Report: Smart Fridge List of Tables and Figures: Figure 1: Block Diagram 4 Figure 2: Example Inventory 5 Figure 3: Design Packaging 6 Figure 4: Gantt Chart 7 Table 1: Division of Labor 8 Figure 5: Gantt Chart 9 3

Introduction: Final Design Report: Smart Fridge The Smart Fridge is an innovative technology capable of assisting shoppers everywhere in keeping tabs on their refrigerators contents.

This can result in missing a key ingredient for a recipe, or in a surplus of the same item which may go unused and be wasted.

4 Introduction: Final Design Report: Smart Fridge The Smart Fridge is an innovative technology capable of assisting shoppers everywhere in keeping tabs on their refrigerators contents. Many people often forget the items they need once they arrive at the grocery store, and have no way of knowing what they do or do not currently have. This can result in missing a key ingredient for a recipe, or in a surplus of the same item which may go unused and be wasted. The Smart Fridge system aims to eliminate this problem by allowing users to scan in items when they bring them home from the store and place them in the fridge, while also providing the ability to scan items out of the fridge when they are eaten or disposed of. The easy-to-use interface allows for nearly zero possible human error, perfect for the even the least technologically inclined people. The user need only select the scanning mode, and the system is ready to scan their items into or out of its inventory. Figure 1. Block Diagram 4

Project Objectives: Final Design Report: Smart Fridge Our project will be able to scan in any 12 digit UPC-A barcode and communicate this barcode through a serial connection from the scanner to the

5 Project Objectives: Final Design Report: Smart Fridge Our project will be able to scan in any 12 digit UPC-A barcode and communicate this barcode through a serial connection from the scanner to the microprocessor. The microprocessor will then compare this UPC to a database located publicly on the internet to obtain the product description via a Roving Networks Wifi module. A pointer will be assigned to the address containing the description. When removing an item from the fridge, the UPC will be compared against the current stored items and once a match is found, the pointer pointing to that item s UPC will be reassigned to the location to which the subsequent pointer points, and so on until all pointers have been reassigned. The Wifi module will allow the refrigerator s current stock to be uploaded to the Smart Fridge website. The website will be updated immediately as new items are scanned in or old items are scanned out. Any internet browser which can display HTML will be able to view the refrigerator s inventory. This allows for portability of the user s grocery list as the user goes to the store with their smart phone which has an internet browser. Figure 2: Example Inventory 5

6 Final Design Report: Smart Fridge Technical Objectives: Digital Hardware Microcontroller Barcode Scanner Wifi Module Cell Phone Analog Hardware Lithium Polymer Battery Charger User Interface Switches (Input) LED Charger Light (Output) Figure 3: Design Packaging 6

7 Project Features: Final Design Report: Smart Fridge User configurable scan modes Access to all encompassing UPC database Automatic standby mode after specific idle time Completely standalone and wireless functionality Ability to charge battery Software Flowchart: Initialize Variables/Arrays, and Declare Function Prototypes New barcode scanned in from USART0? Yes Does UPC currently exist in UPC array? No Yes Increment value in same index of Qty array No Store barcode in UPC array, write 1 to corresponding index in Qty array, increment both array pointers Send command to WiFly chip to look up barcode description on UPC database website Receive HTML of UPC site from WiFly: check Receive buffer for string Des Found Des Haven t found Des Count forward 29 characters, store entire description in the Description array on uc, increment array pointer to next row Send command to WiFly to update inventory.txt file on our webserver via ftp with the current Qty and Description arrays Figure 4. Software Flowchart 7

8 Concept Selection: Final Design Report: Smart Fridge The problem that sparked this project design is that people often forget to write a grocery list, resulting in the purchase of unnecessary items, or conversely the omission of necessary items. We aim to solve this dilemma by creating a system that provides a list of the user s refrigerator contents, no matter where the user is, provided they own a cell phone. There are no modules that serve the Smart Fridge s purpose on the market today. The only possible solutions available are complete refrigerators with a similar inventory tracking feature, but these refrigerators are very expensive. Technology Selection: Chose a barcode scanner capable of both RS-232 and USB communication for flexibility Using a Wifi module in order to check item inventory to user s cell phone browser Using the internet cloud to store current inventory when system powers off Division of Labor: Item Seth Goldberg Kelly McEachern Scanner Communication w/ up 60% 40% Breadboard Layout/Debugging/Breakout Boards 50% 50% Final PCB Design 40% 60% Charge Circuit Design 70% 30% WiFly Programming 30% 70% WiFly Communication w/ up 20% 80% Website Design 80% 20% Table 1. Division of Labor 8

Final Design Report: Smart Fridge Bill of Materials: Part Description Qty Cost ATmega644p 1 $7.39 Serial Barcode Scanner 1 $29.99 Barcode scanner plastic holster 1 $4.

9 Final Design Report: Smart Fridge Bill of Materials: Part Description Qty Cost ATmega644p 1 $7.39 Serial Barcode Scanner 1 $29.99 Barcode scanner plastic holster 1 $4.99 Roving Networks RN-XV WiFi Module 1 $ V LiPo battery 1 $ VDC Power Supply 1 $9.99 DC Power Jack 1 $1.74 DPST Rocker Switch 1 $2.99 SPST Rocker Switch 1 $1.43 LM317T Regulator 1 $0.71 2N2222A NPN Transistor 2 $0.24 1Ω, 1W Resistor 1 $ Ω, 1/4W Resistor 1 $ Ω, 1/4W Resistor 3 $0.12 1kΩ Potentiometer 1 $2.99.1uF, 50V Capacitor 3 $0.31 Heat Sink 2 $ Ω, 1/4W Resistor 1 $0.05 1N4007 Diode 1 $0.13 1N5819 Schottky Diode 2 $1.04 RJ45-8L-B Connector 1 $0.69 LM2940 Low Dropout Regulator 1 $1.02 LM3940 Regulator 1 $1.66 Total $ Gantt Chart: Figure 5. Gantt Chart 9

EEL 4924 Electrical Engineering Design (Senior Design) Preliminary Design Report

EEL 4924 Electrical Engineering Design (Senior Design) Preliminary Design Report February 2, 2012 Project Title: Smart Fridge Team Members: Seth Goldberg & Kelly McEachern Project Abstract: Our project