EE 396: ACCESSORS…..Critical Design Review

Group Members:Allen BuiRuthsenne GagarinErica Salvador

Brief Overview of the project

Objective:

To create an accessor, a device that provides access for individuals who have limited abilities. This accessor will be a household utility controller that will allow the user to (independently access) interact with common household appliances.

Project meaning

Milliea. Bio Cerebral Palsyb. Needs Independence

(Access to the following appliances)

• TV• Phone• Radio

c. Solution to NeedsModify X10 Home Automation Kit

Components Needed:– Mount/user input – LED Display– Picaxe – X10 Remote

(Wireless Communication Controller)

– AppliancesTV, phone, radio

Scanner sub-modulesA. LED Display

1. Vertical display

2. Horizontal display

B. Digital Signal Generator

Physical set up

Overall block diagram

•Scanner/LED Display•Controller (X10)•Transceiver

Major modules:

real switch output address

crosspoint address

input pins

1ON 0001 0110 A6 in0*in7

1OFF 0010 0110 B6 in0*in6

2ON 0001 0101 A5 in1*in7

2OFF 0100 0110 C6 in1*in6

3ON 0010 0101 B5 in2*in7

3OFF 0100 0101 C5 in2*in6

4ON 0001 0100 A4 -----

4OFF 0010 0100 B4 -----

5ON 0001 0011 A3 -----

5OFF 0100 0100 C4 -----

Two picaxe set up

If want to turn appliance 1 on, output 0001 0110

SCANNER-LED Display Circuit Layout

Pseudo Code Map: Scanning Module

Pseudo Code Block Diagram: Scanning Module

SCANNER-LED Display Code

symbol counter = c1

main:for counter = 1 to 2 'Scanning LED lights vertically high 1 'appliance 1 wait 1 if pin4 = 1 then hdisplay 'input low 1 high 2 'appliance 2 wait 1 if pin4 = 1 then hdisplay low 2

high 3 'appliance 3 if pin4 = 1 then hdisplay wait 1 low 3next counter

end

hdisplay: 'Scanning LED lights horizonticallyfor counter = 1 to 2 high 5 'on wait 1 low 5

high 6 'off wait 1 low 6next countergoto main

Methods of testing

• LED’s (LED lit, high voltage)

• Multimeter (measure for high voltage)

• Go for broke! (not preferred)

• If something smells burnt – something’s wrong

Remaining Tasks:

1. Fix code

2. Final testing

3. Fabricating

Current problems• Picaxe too small (need one with just

one more input!)– Bigger picaxe enables to use more

appliance and easier to program

-Picaxe 28X and 40X are in the UK• PCB design dependent on type of

chips used• How do we link two picaxe together

to work as one?

Gantt Chart

Resources• http://archimedes.hawaii.edu/• http://www.homeautomationzone.com/x

10-over.shtml• http://cmap.ihmc.us/• http://www.rev-ed.co.uk/detail.asp?id=r

ev02&prodname=PICAXE

• What are your questions?