Automatic Wake-Up Experience

Automatic Wake-Up

Experience

Group 40

William Bendix, Jake Metz, & Durreh

Tabassu

ECE 445 Senior Design

April 29, 2010

Introduction

 The Automatic Wake-Up Routine provides an

automated approach to the daily, morning

tasks taking them out of the hands of the end

user

 Seeks to reduce stress caused by morning

chores and create a more pleasant

environment to wake up in

Original Concept

Blinds







Coffee

Maker





Alarm









Internet



Thermostat

Overview

 System controlled by “base-station” alarm

clock

 Based around a modular design

 Utilizes RF wireless to allow communications

between the base-station and different

modules

Modular Design

 Central base station provides normal alarm

clock functions

 Coffee maker module to operate coffee

machine prior to wake up time

 Thermostat control to create a comfortable

temperature

 Blinds control to wake end user up with

natural light

 Vocal announcements to rouse end user

Automatic Coffee Maker

 Allows for wireless

control of Coffee maker

 Could be attached to

any model of Coffee

maker

 Small, plastic housing

for aesthetic placement

on kitchen counter

Automatic Coffee Maker

 Relay connected to

power line of coffee

maker

 Only receives wireless

signal when Coffee

maker switch set to “on”

 Powered from DC wall-

adapter or 4 AA

batteries

Alarm Clock



7 segment displays









BCD to Seven

segment

converters

Project build- Alarm clock

1)Coding PIC Microcontroller

a. Use MPLab and CCS compiler

b. Program with PICStart



2)Build Device on Breadboard

a. Testing

b. Debugging



3)Design on Eagle for PCB Fabrication

a. More Debugging

PCB Board

PCB Board

Testing

Testing - I2C Communication

Challenges

 Getting PIC to output constant high/low

values

 I2C Communication

 PCB fabrication – shorts and opens

Schematic for the

thermostat









Schematic for the Blinds

Circuit

Thermostat and the

Blinds Circuit

PWM signal for the motor









Duty cycle changing between 30%-100%

Frequency : 125kHz

Period: 8.0 us.

Testing procedures

Thermostat:



1) Set the desired temperature with local inputs to

PIC

2) Test the high and low temperature trigger for the

sensor using a blow dryer.

3) Test the temperature setting through the wireless

connection

4) Test the heater is on using an LED.

Blinds Circuit:



1) Test the motor control by manually running the motor without the PIC

by using a function generator.



2) Test the wireless control of motors by sending signal to PIC

3) Battery capacity check

a. Use a multimeter to test battery voltage levels

b. Run the motor for 5 minutes (corresponding to 2 motor runs

per day at 5 sec/run for 30 days)

c. Check the Battery voltage level again

Longevity of Power Supply



The thermostat and the blinds circuit would be powered

separately using 4AA batteries. Considering the motor to run

for 5seconds a day, its power consumption is summarized in

the table below.





Voltage (V) Current (mA) Time duration Energy

(h) Consumption

(VAh)

5 600 [(5/3600)h/day]* 0.125

30 days





Average capacity of 4AA batteries = 2.4VAh

Even after considering the negligible power consumed by the thermostat and

the other parasitics of the circuit we can see that our battery power would easily

last for a month.

Wireless Communications









Transmitter: Receiver:







Uses a 315 MHz signal that is Modulated using on off keying

Wireless Communications

 Transmitter must attain DC-level before

sending data

 Receiving circuit must be able to determine

which Module the base-station is talking to

and what function it is meant to perform

 Must not interfere with other wireless devices

Antenna: Calculations

Transmission:

Our calculations show that the

required Gain for the antenna is

Transmission power: Pt = 10 mW

far below a value that a typical

distance: r = 30 m

antenna would be expected to

Receiver power: Pr = -110 dBm

have

frequency: f = 315 MHz



Power per unit area: S = Pt/(4*pi*r2)= 8.84 x 10-7



Pr = 10-110/10=10-11 mW



Effective area: Aeff = Pr/S = 10-14/8.84 x 10-7 = 1.13 x 10-8 m2



wavelength = lambda = c/f = 3 x 108/315 x 106 = .9517 m



Antenna Gain: Aeff = lambda2*G/(4*pi)

G = 4*pi*1.13 x 10-8/.95172 = 1.57 x 10-7

Wireless Communication

 Based on RF-Link 315 MHz 2400 Baud wireless

chips

 Base-Station contains Transmitter

 Modules each have a Receiver









Transmitter Receiver

Wireless Communication

 Transmission Scheme

 Calibration signal to set DC-Level: $55 six times

 Packet Header: $FF, $00, $FE

 8-bit MODULEID followed by INVMODULEID

 8-bit DATA followed by INVDATA

 8-bit CHECKSUM (MODULEID+DATA) followed

by INVCHECKSUM

 Appending characters: $AA four times

 Sends entire scheme 20 times to ensure

reliability

Wireless Communication

 Sample HyperTerm output of transmitter

 UUUUUUÿþŠu4˾AªªªªUUUUUUÿþŠu4˾AªªªªUUUUUUÿþŠu4˾Aªªª

ªUUUUUUÿþŠu4˾AªªªªUUUUUUÿ

þŠu4˾AªªªªUUUUUUÿþŠu4˾AªªªªUUUUUUÿþŠu4˾AªªªªUUUUUU

ÿþŠu4˾Aªªªª



 Sample HyperTerm input from receiver

 ªªþŠp4Ê<@ªªªªþ€t4¼@ ªªªþŠt0ʼ@ªªªªªªªªþˆu4Ê<@ªªªªþˆu4Â<@¨ªªªþ

ˆu$¾@ ªªªþŠu4˾@ ªªªþŠt0˼@ ªªªþˆu4Ê<@€ªªªþŠt0ʼ@ ªªªþŠt

˼@ªªªªþŠp4Ê<@ªªªªþŠu4Ê<@ ªªªþ€u4¾@€ªªª þŠp0Ë<@ªªªªþŠp

ʼªªªª

Voice Synthesizer

 Accepts ASCII

character inputs at

9600baud serial

 Produces English text

 Components:

 TTS256 Allophone library

 SpeakJet Complex

Sound Synthesizer

 LM386 based Audio Amp

Voice Synthesizer

• PCB I/O:

Serial Data In

TTS256

Status Out

• Serial Data in

• Power Inputs

Allophone

“Ready” Signal

Codes

• Configuration

SpeakJet

Switches

• TTS256 Status

Voice Signal

Amplified Audio

• SpeakJet “Ready”

LM386

Signal Out

and “Speaking”

Audio Amp signals

Voice Synthesizer

 Can be used to add voice synthesis to any

project

 SpeakJet Complex Sound Synthesizer

 Creates audible voice synthesis when provided

with vocal allophones using 5-channel synth

 Contains a library of built-in sound effects for

future projects (R2D2 anyone?)

 Inputs to reset chips and set VoiceSynth in

Demo Mode or Baud Rate Configure

Scaling Back

 Original project was meant to have a

webserver to download GoogleCal

appointments and announce audibly

 Web Server was taking too long to construct and

there was question as to whether a PIC would be

able to utilize all of the GoogleAPI’s

 Found it more useful to get wireless and modules

working

 All modules were originally meant to be on

boards, but time constraints prevented this

Ethical Considerations

 Coffee maker will only operate when user has

set the on switch and requires the user to

turn off after operation

 Reduces the chance of overheating due to

system error

 Places the responsibility in the user’s hands just

as with a normal Coffee Maker

Ethical Considerations

 Wireless interference

 315 MHz frequency is set for commercial use. Our

wireless frequency does not interfere with any

commonly used frequencies like that of the cell

phones.