SUPER TOASTER Wes Brown Eastern Kentucky University Computer Electronic Networking

2 OUTLINE Motivation and Introduction Building an Idea Parts and Assembly How it works Testing and Results Conclusion

3 MOTIVATION Hunger... for knowledge (and toast) Finding new ways to use AVR microcontrollers Making something incredibly easy pretty difficult. Finding solutions for problems that don't exist.

4 INTRODUCTION Why a computer controlled toaster? Making toast is not very difficult nor is it very computer controlled. There are no truly computer controlled toasters The issue here how can I enable an otherwise ordinary device to be controlled over the internet?

5 PROBLEM STATEMENT How can I from a computer anywhere in the world control a device? How can I make the process of toasting bread more difficult?

6 BRAINSTORMING Brainstorming was the first step in the process. I also thought of an automated pizza maker but I think that already exists. The toaster idea came later. Needless to say while coming up with ideas I was quite hungry.

7 PROPOSED SOLUTION The solution to needing control over devices via internet is an easy one. Add a web module with I/O. Every device could benefit from a web module. Be it your fridge reporting what is in it or being able to tell if your dishwasher is done running. Taking all of these events and putting them into an RSS feed you could monitor from your phone would allow you to have complete appliance awareness no matter where you are. No longer will you have to worry if you left the stove on as if it is you can turn it back off!

8 PROPOSED SOLUTION I chose to go with a WIZnet WIZ200WEB module as it comes with an ethernet module as well as an ATMEGA128 microcontroller on board. This allows me web control of I/O on the ATMEGA128. The ATMEGA128 controls the toaster as well as an LCD to display status and IP information.

9 PARTS All parts I ordered from Parts List: – Motor – WIZ200WEB – Power Supply 5v/3.3v – Female and Male Headers – 20x4 LCD – 2x NPN BJT Transistors – EZ1086 Fixed Voltage Regulator – 2x 10uf Capacitors – Assorted resistors and wire

10 ASSEMBLY Assembly started on a protoboard. On the protoboard I laid out lines and headers. I will insert a picture of the finished board here.

11 LAYING OUT HEADERS Laying out headers is the first step as it allows you proper spacing of components.

12 WIRING ISP HEADER Laying out headers is the first step as it allows you proper spacing of components.

13 WIRING LCD Laying out headers is the first step as it allows you proper spacing of components.

14 WIRING TOASTER CONTROLS Two transistors and one relay controlled the toaster. A motor was attached to the toaster with a string to pull down the latch. An electromagnet held down the lever.

15 WEB PAGE The web page sends information to the microcontroller. The microcontroller starts the toaster and times the toasting.

16 SCHEMATICS

17 FINISHED PRODUCT LCD was connected. Toaster was connected. Power and ethernet were connected.

18 HOW DOES IT WORK?

19 HOW DOES IT WORK? User selects gradient of toast desired on web page. Web page sends information to Toaster Control Module (TCM.) TCM sends signals to outputs which rack the bread and start the timing sequence for toasting.

20 TESTING AND ISSUES Along the way I had quite a few build issues. Voltage division circuits never work the way you want and draw way too much current. This is the reason I went with the EZ1086 so I could have 5v for my LCD and 3.3v for the network module. ISP header was wired up incorrectly. In the data sheet WIZnet labeled pins that you would normally hook up to the ISP header but had entirely different pins required to program the ATMEGA128.

21 TESTING AND ISSUES I also burnt out one toaster as I hooked up some lines backwards. The day before I made the video the back light of the LCD burnt out for unknown reasons.

22 RESULTS Wonderful computer controlled toast.

23 CONCLUSIONS Web enabled modules are incredibly useful in the workplace. Any device you want reporting on can be setup rather easily and hooked up to the network to report back to a central server. Also its a lot easier than one would think to enable an otherwise ordinary device to communicate using TCP/IP.

24 CONCLUSIONS In this project I have pushed the boundaries of what I know being as I am not a circuit designer or a programmer. (The networking part was easy.)

25 FUTURE WORK With this project I would have liked to also do the following: – Automatic loading of toast (this is patented though.) – Scheduling. – Monitoring progress on LCD. – Slider bar on website for toastieness.

ACKNOWLEDGEMENTS 26 Taken from WIZnet.co.kr/en Taken from SparkFun.com All other pictures taken from Also thanks goes out to Bruce Jung for going through my code.