home central control unit

8/6/2019 Home Central Control Unit

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A-TeamHome Central Control Unit

Kevin Cooke

Peter Larson

Ben VerstegenAndreas Rugloski

Aden Abdillahi


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Design Overview

Home Central Control Unit Controllable by

Laptop

Phone

Able to adjust or turn on/off household items

Ability to check status of garage door and of

thermostat setting


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Functional Requirements

User will be able to access the system via:

Laptop:Use from within houseTest with cable -> Move to wireless

Phone: Password, Voice prompt,Device status (for garage door and

thermostat) and option to change the setting


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Functional Requirements

Turn on and off lights or any other plug-in

devices. Check current setting of house thermostat and

have the ability to adjust it.

Check if the garage door is open or closed and

have the ability to toggle or leave in currentstate.

Turn on and off infrared devices and possiblysome controls such as volume.


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Block Diagram Outline


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Control Unit Block Diagram


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RAM Schematic

AT29C512

Electronically erasable and programmable read only memory(EEPROM)


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Features of AT29C512

Single cycle reprogram (erase and program)

Fast read access time 70ns Low power dissipation (50mA active current and 100uA

CMOS standby current)

Internal program control timer

Typical endurance > 10,000 cycles Single 5V +/- 10% supply

512K memory


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Reset Switch

1M

R1

.1 u

1

D1

B1

SW-

B

GND

GND

VCC

INV INV

Reset

4.

R3

Res1

4.

R4

Res1

VCC

modeA

modeB


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Phone Interface

Upon dialing you will hear a voice prompt

Enter user ID and password Toggle device status

Voice feedback giving device status

Logout command

Requires a touch tone phone

Includes cell phones


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Phone Interface Block Diagram


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Ring Detector TCM1520

Telephone ringing voltage: 90V - 140V @ ~20Hz

TCM1520 Simple, cheap, SAFE!

Use of optocoupler completely electrically isolates

circuit from phone line


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Hook Switch HT18

Hook switch is a switch that connects TIP to the

switching station to connect to incoming call. HT18 is an electronic line switch bypassing the need

for hook switches.


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DMTFDecoder TT7

DTMF: Dual-tone multi-frequency

Every button on phone has two unique frequencies

TT-7 deciphers which button pressed

Buttons 1-9 will be commands

0 will logout


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Audio Feedback ISD2560

ISD2560 Single chip, multi-message, voice record/playback device

Microcontroller compatible Allows complex addressing

Recordings stored on chip in EEPROM

Amplified outputs Connect to audio transformer to send audio data down

phone line


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Serial Interface

Computer connects to home unit via serial

cable Start testing with cable, then move to wireless.

Control of each device using keyboard

Monitor shows status of each device


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MAX232 Level Converter

RS-232 interface requires

+3V to +12V ON state -3V to 12V OFF state

MAX232

Delivers +/- 10VC1+

1VDD

2

C1-3

C2+4

C2-

VEE6

T2OUT7

R2IN8

R2OUT9

T2IN10

T1IN11

R1OUT12

R1IN13

T1OUT14

GND15

VCC16

U3

MAX232CPE

GND

1u

C?

1u

C?

1u

C?

GND

1 2 3 4 5 6 7 8 9

11

10

J?

DConnector9

1 2 3 4 5 6 7 8 9

11

10

J?

DConnector9

Port

Port

Port

Port

GND GND


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Thermostat

Model: Honeywell Pro 3000

Plans of attack:

1) Reverse engineer to nderstand/control

the microprocessor on the circ it board:ATMEGA169V

2) Hardwire as a co nter


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X10 Equipment

The Two-Way Powerline Interface Module

allows us to interface with the powerline usingstandard X-10 protocol.

Connects to a serial port using a standard

RJ11 telephone connector and cable.

We are using the Appliance, Lab and Relaymodule.


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X10 Binary Codes

The Transceiver (PSC05)

provides a 60 Hz square wave

with a maximum delay of 100

sec from the zero crossing point

of the AC power line.


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Software

Phone tree

Majority of software composed from Flash andCPLD

Inputs/Outputs: 8 data bits, 16 address bits,

Inputs: phone signals, serial data, door status,

temp

Outputs: voice prompt, operation commands


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Input Signals

Garage Door - Door sensor on garage door will

go low if the garage door is open or send highif the door is closed.

Thermostat If we use the counter method, we

will hardwire the buttons on the thermostat to

some simple logic which will keep track of thecurrent thermostat setting.


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More Input Signals

Phone Our circuit will pick up the ring signal

and take it off-hook. From here our TT7 willread in the two sine waves and will set the

corresponding pin to low.

Laptop The serial port on the microcontroller

will wirelessly receive the signals from the

laptop via a transceiver.


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Output Signals

Toggle lights via X10 signal

Garage door toggle signal

Thermostat: increment or decrement command

Infrared: sends signal pattern to infrared LED

Voice Prompt


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Parts List

Part #

Name Model1 Thermostat Honeywell PRO3000

2 Microcontroller MC68HC11E0

3 Door/Window Sensor N/A

4 X10 Transceiver 2-way power line

5 X10 Appliance module 2 Pin Polarized

6 DTMF Decoder R-TT7


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Updated Deadlines and Goals

Feb 27th CDR:working phone decoding and micro

controller running (no code) with working reset. Mar 20th Milestone I:computer and phone

control over lights and garage door.

Apr 17th Milestone II:computer and phonecontrol over lights, 1 infrared device, thermostat andgarage door motor, final PCB layout complete.

May 3rd Capstone Expo:wireless computer andphone control over lights, thermostat, infrared devices,all bugs worked out.


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Testing

Microcontroller-

-Used logic analyzer to check reset button andwiring.

DTMF Phone decoder-

- First tested the lab phone line directly tocircuit

- We then called the lab phone from a cellphone and tested if the circuit was reading the

correct inputs.


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Group Member Tasks

Kevin Thermostat, Infrared Devices Peter Microcontroller, RAM, Lighting Controls

Aden Microcontroller, RAM

Andreas Tech. Ref. Manual, Garage Door Device,

Phone Interface

Ben Phone Interface, Control Cards, PCB


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THANKS!

ANY QUESTIONS?

home central control unit

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