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Bluetooth Z8 – Yao Chen 1

Bluetooth Z8

Project ReportFor CSci297 Embedded System

Yao Chenchenyao927@gmail.com

April 22, 2008

1. Introduction

This project intends to implement an information transaction between Zilog

Z8 Encore! Microcontroller Unit and a cell phone via Bluetooth connection.

Once the communication is established, user is allowed to send a command

from cell phone to the Z8 to request some information, e.g the temperature.

The Z8 MCU is supposed to be used as a countdown alarm and stringdisplayer as well.

Figure 1: Z8 Encore! MCU Connection

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2. Components

Generally, there are five basic components for this project:

1) Z8 Encore! Microcontroller Unit;

2) Bluetooth Module;3) Temperature Sensors;

4) Speaker;

5) Java and Bluetooth supported cell phone.

Figure 2: SparkFun Bluetooth Module

Figure 3: Temperature Sensors

The Bluetooth module used in this project is manufactured by SparkFun

Electronics and the Bluetooth component is Philips BGB203. The

temperature sensors used here are ADC and I2C sensors.

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3. Project Description

3.1 Functionality:

1) Z8 Side

a) Z8 has physical connections with Bluetooth module, temperature

sensors and speaker; b) Z8 reads temperature data from both two sensors;

c) Z8 is implemented as a countdown timer. When the time is up, the

speaker sounds as an alarm;

d) Z8 displays string with LED arrays;

2) Cell Phone Side

a) Cell phone runs J2ME application to discover the devices in the

certain range with Bluetooth;

 b) Cell phone connects to the target device;

3) Communicationa) Cell phone detects the Bluetooth module that links to Z8 MCU and

asks for connection by sending a passkey “0000”;

 b) Z8 receives the passkey and reminds user there is a connection

request which is supposed to be answered by pressing switch 1

(sending answer key “Z8BT”);

c) When connection is established, cell phone is supposed to send a

string or a command to Z8;

d) Z8 displays strings with LED arrays or answers the requests from

cell phone.

Figure 4: Connection Negotiation

3.2 Developing Technologies

1) Z8 Encore! Family IDE version 4.10 (06121401)

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Used to develop and debug the program on Z8.

2) Java JDK 1.6

Sun Java compiler, used to compile the program on cell phone.

3) Sun Wireless Tool Kit (WTK) 2.5

Emulator, used to compile and debug the J2ME application for mobile

devices.

4) Sun Netbeans IDE 6

Developing tool for J2ME application.

4. Hardware

4.1 Overview

Figure 5: Overview of implementation

 Nokia N93i:

GSM mobile phone;

CLDC 1.0/MIDP 2.0 J2ME support; Bluetooth support;

Typically, all Java runtime environment supported mobile devices

meet the requirement of this project.

Zilog Z8 Encore:

Z8F6403 8 bit microprocessor;

UART interface for Bluetooth communications;

Physical Connection

Wireless Connection

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GPIO pins;

ADC and I2C interfaces for temperature sensors;

SparkFun Bluetooth Module:

Philips BGB203 Bluetooth Component;

UART interface, baud rate at 9600;

Plug-and-play Bluetooth class 1 System-in-a-Package (SiP);

Peripheral pins 1.8 and 3.3 V;

LM34 Temperature Sensor:

Analog data output;

Calibrated directly in degrees Fahrenheit;

Linear +10.0 mV/°F scale factor;

Rated for full 50° to +300°F range;

Operates from 5 to 30 volts;

TMP175 Temperature Sensor:

27 Address ; Digital Output: Two-Wire Serial Interface;

Resolution: 9- to 12-Bits, User-Selectable;

Wide Supply Range: 2.7V to 5.5V.

4.2 Pin Connection Detail

Table 1: Pin Connection Detail

Module Zilog Z8

SparkFun

Bluetooth

VDD Power supply VCC (3V)

GND Ground GNDRX Receive register Port D bit 5 (Transmit register)

TX Transmit register Port D bit 4 (Receive register)

RTS Request to send Loop to disable hardware flow

controlCTS Clear to send

ADC

Sensor 

VDD Power supply VDD (5V)

VoutOutput of analog

signal

Port B bit 1 (Analog pin 1)

GND Ground GND

I2C

Sensor 

VDD Power supply VDD (5V)

SCL Serial clock signal Port A bit 6 (SCL)

SDA Serial data signal Port A bit 7 (SDA)

GND Ground GND

Speaker Pin 1 2 pins for speaker’s

high and low

PC0

Pin 2 PC1

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4.3 Hardware Diagram

Figure 6: Hardware Diagram

5. Software5.1 Z8 Side

The program starts with waiting for connection request. When there is a

request being received, the program verifies the request string. If the string is

correspondent to the default, Z8 sends an answer to cell phone to establish

the connection. Then receiver of UART1 keeps waiting for the data. When

the string is received, program checks the string whether a command or a

string received. If the data starts with command mark “~”, validate the

following bytes to find out if it is a valid command or not. If it is a string,

display it on the LED.

Zilog Z8

VCC (3V)

VDD (5V)

PB1 (ALG1)

PD5 (TXD1)

PD4 (RXD1)

PA6 (SCL)

PA7 (SDA)

PC0

PC1

Temperature

Sensors

ADC VDD

ADC VOUT

ADC GND

I2C VDD

I2C SCL

I2C SDAI2C GND

VDD GND

RX TX RTS CTS

SparkFun BT

Pin1

Pin2S eaker

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Figure 7: Z8 Software Implementation

Startup

Send answer 

Countdown

RequestString

Temperature

Request

Read

Temperature

Send

Temperature

Start Timer 

and alarm

Send

Instruction

Display

String

Send

Receipt

Help

Send

Instruction

Error 

Display

Error 

Send Error 

Message

Wait for input

Check input

Wait for request

Check request

Initialization

Connection

Established

 Not a

Request

Valid Request

 NO

Receive

String

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5.2 Cell Phone Side

Figure 8: J2ME Software Implementation

5.3 Programming Detail

ZDS Project – BluetoothZ8.zdsproj:

Table 2: Files of ZDS Project

File Description Implementation

ADC.cInitialize and read from ADC

temperature sensor.

ADC_init();

ADC_read();

function.cValidate the type of receiving string;

Send temperature information.

check_string();

send_temp();

float_to_char();

read_num();

char_to_int();

GPIO.c

Initialize the LED array;

Initialize the switch 1;

Initialize the speaker;

Switch 1’s interrupt.

gpio_init();

sio_init();

speaker_init();

isr_sw1();

I2C.cInitialize and read from I2C

temperature sensor.

I2C_init();

I2C_read();

Main Midlet

Startup

Device List

Send Request

User GUI

Debug Form

Debug Form

Debug Form

Send Cmd

Debug Form

Receive Listen

History Log

Destroy

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interrupt.cInitialize Timer1 for PWM output on

speaker.

timer1_init();

isr_timer1();

enable_mute();

disable_mute();

LED.c Functions for LED display. led_all_off();etc.

main.c Main file to startup the program. main();

timer.cInitialization and interrupt of timer 0

which is countdown timer.

timer0_init();

isr_timer0;

uart.c

Initialize the UART registers and

receive interrupt;

Functions for sending string.

uart_init();

isr_uart1_rx();

send_string();

send_byte();

etc.

J2ME project – Bluetooth&Z8:Table 3: Files of J2ME Project

File Description

Agent.javaClass for connecting the remote Bluetooth module and

sending or receiving data.

Conn.java Class for establishing connection.

Debug.java Form of debugging report.

DeviceList.java List of found devices.

Logger.java Form for displaying receiving data and history operations.

MainUI.java Form of user’s GUI.Z8BT.java Main Midlet of project.

5.4 Implementation Detail

Command Syntax:

“~”<command><configuration><parameter>

<command>: required;

<configuration>: required when set Z8 as a countdown timer;

<parameter>: optional.

Mobile Device Logger:

Previous command is:

~<command><configuration><parameter>

Response:

<response>

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Command Set of Project:

Table 4: Command Set

Cmd DescriptionImplementation

Z8 LED Mobile Device

~Hor ~h

Request help from Z8. “HELP” Display receivedhelp information

on logger form.

~T

or ~t

Request all Temp data and

differential value.

Optional configure:

-A or a: from ADC sensor.

-I or i: from I2C sensor.

Specific Temp

data or differential

Temp value.

Display received

Temp information

on logger form.

~C

or ~c

Set Z8 as countdown

alarm.

Required configure:-A or a: automatically start

timer.

-M or m: manually start

timer by user.

<parameter> should be

greater than 0.

Display integer value of 

<parameter>.

When time is up,

speaker sounds to

remind user.

Display operations

required to start or 

stop alarm on

logger form.

6. Summary

This project is a highly practical example for integrating the software and

hardware technologies. The concept of this project is not only focusing on

the temperature capturing, but also many utilities in the regular life. I really

hope it can be helpful for the public services in the future.

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Appendix - Photo

Figure 9: Overview of Project

Figure 10: Debug Report

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Figure 11: Device List

Figure 12: Connection negotiation

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Figure 13: Request ADC Temperature Information

Figure 14: Set a Manual Countdown Timer 

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Figure 15: Instructions of Help