Iowa State University



Iowa State Science Center

Akiko

Dec08-07

Project Plan

Client

Thorland-Oster, Vicky

Faculty Advisor

Dr. Jacobson, Douglas W

Team members

Moran, Alex S

Kang, June K

Yoo, Seung H

February 22, 2008

REPORT DISCLAIMER NOTICE

DISCLAIMER: This document was developed as a part of the requirements of an electrical and computer engineering course at Iowa State University, Ames, Iowa. This document does not constitute a professional engineering design or a professional land surveying document. Although the information is intended to be accurate, the associated students, faculty, and Iowa

State University make no claims, promises, or guarantees about the accuracy, completeness, quality, or adequacy of the information. The user of this document shall ensure that any such use does not violate any laws with regard to professional licensing and certification requirements. This use includes any work resulting from this student-prepared document that is required to be under the responsible charge of a licensed engineer or surveyor. This document is copyrighted by the students who produced this document and the associated faculty advisors. No part may be reproduced without the written permission of the senior design course coordinator.

Table of Contents

Table of Contents 2

2. List of Tables 3

3. List of Definitions: 3

4. Problem Statement 4

5. Executive Summary 4

6. Project Name 5

7. Concept Sketch 5

8. Block Diagram 6

8.1. LED Functional Diagram 7

8.2. Monitor Functional Diagram 8

8.3. Sensor Functional Diagram 9

8.4. RFID Functional Diagram 9

8.5. Bluetooth Functional Diagram 10

9. Operating Environment 10

10. User Interface Description 11

10.1. Intended Users 11

10.2. System Control 11

11. Market Analysis 11

11.1. Existing Patents 11

11.2. Cost analysis 12

12. System Requirements 13

12.1. Sonar 13

12.2. Heat Sensor 13

12.3. RFID 14

12.4. LED Display 15

12.5. Monitor 17

12.6. Bluetooth 17

12.7. Control 18

13. Risks 18

14. Proposed Timeline 19

15. Summary 20

16. Project Team Information 21

List of FiguresFigure 1: Concept Sketch 5

Figure 2: System Block Diagram 6

Figure 3: LED Functional Diagram 7

Figure 4: Monitor Functional Diagram 8

Figure 5: Sensor Functional Diagram 9

Figure 6: RFID Functional Diagram 9

Figure 7: Bluetooth Functional Diagram 10

Figure 8: LED Functionality (Diagram 1) 16

Figure 9: LED Functionality (Diagram 2) 16

List of Tables

Table 1: Operating Environment Requirements 10

Table 2: Cost Analysis 12

Table 3: Sonar Requirements 13

Table 4: Heat Sensor Requirements 14

Table 5: RFID Requirements 14

Table 6: LED Light bar Requirements 17

Table 7: Monitor Requirements 17

Table 8: Bluetooth Requirements 17

Table 9: Control Requirements 18

Table 11: Fall Timeline 19

List of Definitions:

|Acronym |Meaning |Definition |

|-- |Bluetooth |An industrial specification for wireless personal |

| | |area networks (PANs) |

|ECpE |Electrical and Computer Engineering |  |

|LED |Light Emitting Diode |  |

|PV |Photovoltaic |A technology that converts light into electricity |

|RFID |Radio Frequency Identification |An automatic identification method, relying on |

| | |storing and remotely retrieving data using devices |

| | |called RFID tags or transponders. |

|Sonar |Sound Navigation and Ranging |A technique that uses sound propagation (usually |

| | |underwater) to navigate, communicate or to detect |

| | |object distances. |

Problem Statement

Each major at Iowa State University uses a series of demonstrations in order to encourage prospective students to choose a particular field of study in engineering. Despite being the current leader in technological advances, the Electrical and Computer Engineering (ECpE) program at Iowa State does not have a demonstration that shows off the knowledge and skills of an ISU ECpE in a fashion which would encourage students to choose ECpE as their field of study. The technology surrounding people such as cell phones, computers, and video games have become commonplace, and they have therefore lost their potential to create excitement for entering the field of ECpE.

Executive Summary

The Iowa State Science Center is the development of an interactive room that will demonstrate principles of ECpE. A laboratory will be fitted with various sensors capable of feeding back data to a computer. The lab will be designed to be easily upgraded for future programs, and will be expected to grow in the future. The initial build will integrate some of the initial hardware, and will be capable of a demonstration at the end of the second semester. The following list shows the current expected functionality, and sensors which will be implemented.

Planned Devices:

• Sonar Distance Sensors

• Microphone

• Heat Sensing Devices

• LED Light Display

• Monitor

• Audio Out

The light interaction and the Bluetooth device recognition are the current focal points of the room. Each of these gives an interactive demonstration of multiple areas of ECpE. A simple script will be developed that explains the correlation between different features within the room and how they pertain to fields of study within ECpE. With the perception that many people have about how these fields of study are boring, a demonstration that people can see, hear, and interact with will increase the number of people who apply to and join Iowa State for Electrical and Computer Engineering.

Deliverables for this project will include a project plan, design document, tour guide script, and an initial build of the ISSC.

Project Name

Many projects are given a name to create more association with the project. Officially the title of the project is the Iowa State Science Center (ISSC). The development team has nicknamed the project Akiko. Akiko means Bright Light, and is used to associate the project both with the interaction of colorful lights, and the intelligence the room is capable of displaying.

Concept Sketch

[pic]

Figure 1: Concept Sketch

Figure 1 shows the proposed layout for the room. The entrance and exit of the room will contain Radio Frequency Identification (RFID) sensors for detecting when a tour guide enters, and leaves the room. The RFID sensor will be designed to recognize specific individuals, and greet the tour guide appropriately. Ability to program the RFID tags will be integrated into the computer. A sophisticated interface is not planned for this phase of the project, and is an option for future development.

Each of the 6 colored bars represents a different LED Light bar. The proposed light bars will use high intensity LEDs that can change in intensity based upon different factors within the room. Sonar, Thermal, and audio sensors will be the primary sources for changing the lighting effects. Detailed Information regarding the functionality of the lights can be found in 12.4 LED Display.

The corner of the room will also contain a monitor. The monitor will be used to display statistics that the room will be capable of receiving. Some of the proposed information that will be implemented within the first year will be Bluetooth device count, tour guide name and ambient temperature.

The room is not planned to be finished within one year. This ISSC will be designed to be upgraded easily, and will gain functionality in future years. Audio output will be included in order to welcome tour guides, but does not have any additional functionality planned for the current time.

Block Diagram

[pic]

Figure 2: System Block Diagram

As stated in the introduction, the ISSC will be designed to attract prospective students into the Electrical and compute engineering. The basic system can be broadly broken down into inputs and outputs. Figure 2: System Block Diagram represents the ISSC, and is color coded for simplicity. There are a total of three (3) analog inputs to the system [blue], and two (2) digital inputs [green]. The controller will be developed entirely within Labview, and will give control over which inputs are being utilized.

The ISSC also utilizes three (3) different outputs [orange]. An LED light bar system, monitor, and a sound system each will be utilized four outputs to the system. Further discussion about the implementation of each of these systems will be discussed within their respective requirement sections.

The analog inputs will consist of four (4) sonar sensors, two (2) thermocouples, and one (1) microphone. All of the sensors interacting at the same time would cause too much overall gain, and would result in a boring display. In the event that multiple sensors are set to true (on), priority is given in order to ensure that only one input is being utilized. The priority is as follows:

Highest priority: Sonar array.

Second priority: Microphone array.

Third priority: Thermocouple array.

In the event that no sensors are turned on, an alternative display will be developed. Initially, the system will be set to a constant half intensity. If additional time is available, a more diverse idle display will be developed.

The following sections depict individual system descriptions.

1 LED Functional Diagram

[pic]

Figure 3: LED Functional Diagram

The LED display will consist of six individual LED controllers, which will be capable of controlling the intensity of the six individual LED light bars. Programming for light bar intensity will be broken down into three basic stages.

• Ensure individual control of all of the light bars

• Create the ability to properly dim each of the light bars

• Control the dimming function by means of the sensor inputs (see section 12.4 LED Display)

Programming for the entire project will be completed using a mixture of Matlab and C++ tools.

2 Monitor Functional Diagram

[pic]

Figure 4: Monitor Functional Diagram

The monitor will be one of the most complicated subsystems to develop due to the graphic display of each function. Each of the planned functions will be developed individually (Guide name, temperature display, and Bluetooth count). After the individual displays have been developed, a master display will be built which will be capable of displaying all of the information at the same time.

3 Sensor Functional Diagram

[pic]

Figure 5: Sensor Functional Diagram

The Sensor subsystem will ensure that each of the sensors is efficiently powered, and that each sensor can effectively communicate with the computer. This initial build will allow for future development of sensor systems. Verification of this system will be completed with small scale (external to the computer) and large scale (internal computer readouts) tests.

4 RFID Functional Diagram

[pic]

Figure 6: RFID Functional Diagram

RFID capability will integrate easily, and will be capable of simply plugging into the computer via Ethernet cable. A system will also be created for easily entering and changing names associated with different ID tags for RFID recognition. Human Machine Interface will be determined during the design phase.

5 Bluetooth Functional Diagram

[pic]

Figure 7: Bluetooth Functional Diagram

The Bluetooth sensor will be a basic plug and play Bluetooth antenna. A Bluetooth sniffing program developed by an ISU doctoral student will be used to count the number of Bluetooth devices within the vicinity.

Operating Environment

The ISSC will be built in a spare laboratory within Coover hall (exact room number to be determined). All equipment and the final project will be designed in such a way that the equipment will operate without degradation, with minimal risk of damage, and with no risk of electric shock to any users. Table 1: Operating Environment Requirements contains operating environment requirements for the ISSC. Each operating environment requirement is labeled and numbered OP-REQ #.

Table 1: Operating Environment Requirements

| |Requirement |Statement |

| |OP-REQ 1 |All equipment shall be capable of operating without degradation between 10⁰C and 52⁰C |

| |OP-REQ 2 |All equipment shall be capable of operating without degradation over a humidity range of |

| | |0-60% (standard indoor humidity) |

| |OP-REQ 3 |All equipment shall be capable of operating without degradation by means of a standard |

| | |wall outlet. |

| |OP-REQ 4 |All equipment that does not require 120VAC shall be capable of operating with limited risk|

| | |(cost) involved. |

| |OP-REQ 5 |All equipment shall be encased in such a way as to minimize risk of breaking by human |

| | |interaction. |

| |OP-REQ 6 |All equipment shall be protected and wired so that no electric shock risk is present. |

User Interface Description

1 Intended Users

The ISSC will be designed to be utilized easily by any student (current or prospective) who wishes to interact with the system. Intimate knowledge will not be necessary to utilize the system. The primary users will be tour guides with prospective future ISU Electrical and Computer Engineering students. A script that is not directly associated with the system will be developed to help non-ECpE student tour guides to accurately explain what is happening in the room.

2 System Control

This system will be designed to require minimal human interaction. The ISSC will have a single common power control for all sub-systems, with the exception of the computer interface, which will have a separate power control. The program will be activated manually if a master shutdown is used on the system. Power control may be integrated into the RFID tags, if time permits. The system will have a control unit as well, to allow switching between sensor inputs. The RFID and Bluetooth capabilities will always be operational.

Market Analysis

1 Existing Patents

The ISSC is not in direct conflict with any existing patents on the market today. The functionality that is to be used is open for implementation.

The number of patents that exist for various light controlling capabilities is to numerous to accurately display within this document. Included below are three of the patents that appear to most closely associate with the system being designed. Even though similarities exist, the concepts that are to be utilized within the ISSC are considered to be “general knowledge” that is readily available to the public with proper research, so no patent infringements are foreseen.

This project is not intended for mass production or commercial use.

Light Control System:

Patent number: 4095139

Filing date: May 18, 1977

Issue date: Jun 13, 1978

Inventors: Alan P. Symonds, William K. Durfee

Primary Examiner: Charles F. Roberts

Synthesized music, sound and light system:

Patent number: 5461188

Filing date: Mar 7, 1994

Issue date: Oct 24, 1995

Inventors: Marcello S. Drago, Alexander Leon, Kenneth J. Franco

Transmissive and reflective optical control of sound, light and motion:

Patent number: 5017770

Filing date: Aug 2, 1989

Issue date: May 21, 1991

Inventor: Hagai Sigalov

 

2 Cost analysis

Below is an analysis of estimated costs for the project. The proposed costs may change as the design effort progresses.

Table 2: Cost Analysis

|Item |Quantity |Price |Total Price |Implementation Cost |

|Parts and Materials |  |  |  |  |

|Sonar Sensor |4 |$30 |$120 |$120 |

|Heat Sensor |2 |$34 |$0 |$0 |

|Microphone |1 |$18.00 |$18 |$18 |

|RFID Reader |2 |$1,200 |$2,400 |$0 |

|RFID Tags |10 |$1.50 |$15 |$0 |

|Bluetooth Receiver |1 |$38 |$38 |$38 |

|Monitor |1 |$195 |$195 |$0 |

|Audio |1 |$25.00 |$25 |$25 |

|LED1 |4 |$177.00 |$708 |$708 |

|LED2 |4 |$32 |$128 |$128 |

|Project Poster |1 |$50 |$50 |$50 |

|Miscellaneous Supplies |N/A |$25 |$25 |$25 |

|  |  |Total |$3,082 |$404 |

|  |  |  |  |  |

|  |  |  |  |  |

|  |Hours |Weeks |Price |  |

|Moran, Alex S |7 |28 |$1,960 |  |

|Kang, June Koo |7 |28 |$1,960 |  |

|You, Seung Han |7 |28 |$1,960 |  |

|  |  |  |$5,880 |  |

The red highlighted LED1 represents the final implementation LEDs for the room. These high intensity LED’s are designed for mounting, and are significantly more expensive then the test LEDs that are to be used. The cost of LED1 is not included in the final cost. The yellow bar represents miscellaneous costs that will be incurred during the build of the ISSC. This cost is estimation for the materials necessary for the ISSC (wood, switches, wire, and etc.).

System Requirements

The following details the requirements for the ISSC. All functional requirements are labeled and numbered F-REQ #. All non-functional requirements are labeled NF-REQ #.

1 Sonar

There will be four (4) different sonar detecting units in the room. The Sonar sensor array detects objects from four (4) different points throughout the room. The Sonar sensor operates in 2.5V to 5.5V. Sonar sensor outputs are sent to the computer interface for conversion from an analog voltage signal to a digital signal that the computer can interpret. Depending on values, the LED will vary. Table 3 lists the requirements for the sonar system.

Table 3: Sonar Requirements

| |Requirement |Statement |

| |NF-REQ 1 |The system shall include 4 different sonar detecting units. |

| |F-REQ 1 |The Sonar sensor array shall detect objects from 4-12 different points throughout the |

| | |room. |

| |NF-REQ 2 |The Sonar sensor shall be capable of output values from 2.5V to 5.5V. |

| |F-REQ 3 |The Sonar sensor shall be capable of detecting objects which are from 3’ to 21ft from the |

| | |sensor. |

| |F-REQ 4 |The Sonar sensor outputs shall be sent to the DCU for conversion from an analog voltage |

| | |signal to a digital signal that the computer can interpret. |

2 Heat Sensor

Thermocouples create a voltage or a resistance that is directly related to temperature. This output is linearly dependency to temperature. Either device (voltage based, resistance based) is not in the correct range, or format to be handled by the computer. A signal conditioning module will need to be made to get an acceptable range of values for the computer to interpret.

The thermocouples will be outputting to two different sources. The monitor will be displaying the temperature of each of the individual thermocouples, as well as the ambient temperature that averages between the two. Additionally, the LED display will be capable of creating a light display based off of the temperature values that are currently being detected. Table 4 lists the requirements for the heat sensor.

Table 4: Heat Sensor Requirements

| |Requirement |Statement |

| |NF-REQ 2 |There shall exist 2 different heat sensing devices. |

| |NF-REQ 5 |The heat sensors shall be able to operate in the 0V to 5.5V range. |

| |F-REQ 6 |The heat sensor shall be capable of reading temperature values from 0⁰C to 120⁰C. |

| |F-REQ 7 |The Sonar sensor outputs shall be sent to the DCU for conversion from an analog voltage |

| | |signal to a digital signal that the computer can interpret. |

3 RFID

An RFID sensor will be utilized in order to determine when a tour guide has entered and left the ISSC. The RFID reader will recognize specific individuals via RFID tags that are within range of the industrial RFID sensor. The RFID sensor will communicate with the computer via Ethernet.

We will use FRID to detect RFID sensors when a tour guide enters and leaves the room. RFID reader will recognize the specific individuals through RFID tags. Using radio frequency, RFID reader reads the tags which are within the recognition distance. Tags will have individual person’s data through storing information in computer. RFID reader which has frequencies between 860MHz and 960MHz will be used. It needs 5V DC power. Table 5 lists the requirements for the RFID.

Table 5: RFID Requirements

| |Requirement |Statement |

| |NF-REQ 3 |There shall exist 2 different RFID sensors at different entrances/exits to the ISSC. |

| |NF-REQ 4 |RFID reader with a frequency range of 860M Hz ~ 960M Hz shall be used. |

| |NF-REQ 5 |Antenna Compatibility shall utilize a Built-in 7dBi antenna. |

| |NF-REQ 8 |The RFID Shall operate off of a 5 VDC power supply, 5 watts maximum power. |

| |F-REQ 9 |Operating Method will be FHSS or fixed frequency which is selectable by software. |

| |F-REQ 10 |Reorganization distance shall be between operational from zero (0) to a minimum of two (2)|

| | |meters. |

| |F-REQ 11 |The RF power range shall operate between 20dBm ~ 30dBm |

| |F-REQ 12 |The RFID shall be capable of recognizing no less then 100 different RFID signals. |

4 LED Display

The LED display will consist of between four (4) and six (6) different LED colors. Each LED light bar operates off of 12 VDC. Dimming can not be controlled by changing the voltage supplied to the system. Instead, the intensity of each bar will be controlled by using pulse width modulation. By varying the duty cycle, the average power being delivered to the LEDs is changed. This creates the ability to brighten, or dim the LED bars (as perceived by the human eye for a sufficiently high frequency).

Each of the bars shall be independently capable of linear variance of intensity. How the lights react is dependant on each of the individual systems, but several basic principles will be apparent for each light bar.

Each light bar will have a central value that represents a maximum intensity for a given input. As a value deviates away from the central value, there will exist a Gaussian distribution with a determined bandwidth. In other words, as the input deviates from the central value, the light bar associated with that value will dim. As a value approaches a central value, the light will get brighter. Figure 8: LED Functionality (Diagram 1) and Figure 9: LED Functionality (Diagram 2) demonstrates the interaction between the sensors, and two different light bars for arbitrary values. Ranges for each of the sensors will be determined during the design phase of the project.

[pic]

Figure 8: LED Functionality (Diagram 1)

[pic]

Figure 9: LED Functionality (Diagram 2)

The light bars can not be controlled directly by the computer. Instead, a stepper motor will act as the interface between the computer, and the light bars. Each stepper motor can not handle the power that is necessary for each individual LED light bar, so a high current switch will be used in conjunction in order to supply the necessary power. Table 6 lists the LED light bar requirements.

Table 6: LED Light bar Requirements

| |Requirement |Statement |

| |NF-REQ 6 |The LED display shall contain between 5 and 6 different color bars. |

| |NF-REQ 7 |The LED Display shall be designed such that the LEDs will not burn out at maximum |

| | |irradiance. |

| |NF-REQ 8 |The LED display shall operate off of a standard 5 volts supply. |

| |F-REQ 13 |The LED display shall be capable of linearly transitioning between different intensity |

| | |values. |

| |F-REQ 14 |The LED display shall have independent control for each light bar. |

6 Monitor

The monitor shall be implemented to display the Bluetooth count, ambient temperature values, and the current tour-guides name. Each of theses displays shall be aesthetically pleasing for tours going through the room. More functionality will be added in future years by additional senior design teams.

Table 7: Monitor Requirements

| |Requirement |Statement |

| |NF-REQ 9 |The Monitor shall be viewable from any point in the room. |

| |NF-REQ 10 |The Monitor shall be above eye level. |

| |NF-REQ 11 |The Monitor shall be color |

| |NF-REQ 12 |The Monitor may be high definition. |

| |NF-REQ 13 |The Monitor shall be able to operate in 120V. |

| |F-REQ 15 |The Monitor shall be able to output individual RFID identification. |

| |F-REQ 16 |The Monitor shall be capable of displaying the heat sensor information. |

| |F-REQ 17 |The Monitor shall be capable of displaying the Bluetooth count information. |

| |F-REQ 18 |The Monitor shall be capable of being clearly read in ambient light. |

7 Bluetooth

The Bluetooth receiver will be capable of reading Bluetooth signals present in the room. Protected Bluetooth devices will not be capable of being detected. The Bluetooth program will provide a count to the computer, which will be capable of being displayed on the monitor.

Table 8: Bluetooth Requirements

| |Requirement |Statement |

| |NF-REQ 14 |The Bluetooth hardware shall not require any modifications to integrate into the system |

| |F-REQ 19 |The Bluetooth hardware shall be able to detect any Bluetooth device within the ISSC. |

| |F-REQ 20 |The Bluetooth software shall be capable of counting the number of Bluetooth devices within|

| | |the ISSC. |

8 Control

The ISSC control device will simply be a set of discrete switches which are capable of telling the system which sensor to utilize at a particular time. The controller will be built in a hard container to protect the wiring and switches from damage. Table 9 shows the control requirements.

Table 9: Control Requirements

| |Requirement |Statement |

| |NF-REQ 15 |The controller will be encased in such a way as to protect the wiring from damage by |

| | |external interaction. |

| |F-REQ 21 |The controller hardware shall be capable of switching on and off at least three different |

| | |discrete values. |

Hardware Specifications

The ISSC will be composed of five (5) different types of input, and three (3) different outputs, all interfacing through a standard computer. The computer will be capable of accepting analog voltage values in through a standard card interface, and will be capable of outputting an audio signal (3.5mm audio jack), video signal (VGA Connector), and a PWM (RS232).

The following sections specify all of the necessary hardware information for the ISSC.

1 Top Level Hardware Specifications

The following diagram depicts the top level connections for each piece of hardware that will be implemented for the ISSC. Each of these devices will be discussed in detail in the following sections, and will include a lower level description of the individual equipment being implemented.

[pic]

Figure 1: Top level Hardware Integration

The top level specifications for the LED driver and LED bars are covered in great detail within the respective section, and are not included on the top level diagram. The following sections give the necessary hardware specifications for development.

2 Heat Sensor

The ISSC will be using two Mamac Systems model TE-205-B-7-C-1 Thermistor. The following explains how to read the model number.

TE – Heat Probe

205-B – Enclosure model

7 – Temperature model (10,000 ohm Thermistor)

C-1 – Probe style (6 inch duct probe).

[pic]

Figure 2: TE-205-B-7-C-1 Thermistor dimensions

|Specification |Range |Units |

|Probe Type |Negative Temperature Coefficient Thermistor |N/A |

|Operational Temperature |-40 (-40) Min |°F (°C) |

| |250 (125) Max |°F (°C) |

|Dimensions |0.25” Outer Diameter |Inches |

| |0.5 mm wall |mm |

| |6” probe length |Inches |

3 Burr-Brown INA330 Thermistor Signal Amplifier

Values output by the thermistor can not be directly read by the computer. The ISSC requires that each input be within the 0-5 V range for analysis. THE INA330 will be used to accomplish this.

[pic][pic]

Figure 3: INA330 Pin diagram and Temperature Control Loop

|Specification |Range |Units |

|Supply |+2.7 V Min |Volts |

| |+5.0 V Max | |

| |+5.5 V Absolute Max | |

|Vadjust |+0.0 V Min |Volts |

| |+5.0 V Max | |

| |+2.5 V Set | |

| | | |

| |+/-0.9 V/°C |Volts per degree Celsius |

|Rset |10KΩ Set |Ohms |

| |2 KΩ Min | |

|Rg |200 KΩ Standard |Ohms |

|Cfilter |500pF |Farads |

|V excite |+1 V |1 Volt |

|V1=V2 |Vexcite(at set point of 77 °F) |Volts |

Calibration of the INA330 is controlled via Vadjust. Each 0.9 V change of voltage will correspond to a 1.8°F (1°C) change in temperature. This allows a total calibration offset of ±5°F (±2.5°C). The value can be determined mathematically, and is discussed in the I/O section of this document.

Operating the INA330 above 1 kHz will result in a large degree of noise, which must be compensated for. For this reason, the INA330 will operate at the 1kHz range within the ISSC. The thermistor connection can be seen in the above diagram, and as such, no additional diagrams will be included. Both thermistors will be connected identically with exception to the pin connection to the A/D Converter.

4 Sonar

The primary and default sensor for the ISSC will be the sonar array. This uses sonar waves to determine the distance to the closest object. The dimension of the device is 0.785" x 0.870" x 0.645". It’s very light (4.3g) and designed for protected indoor environments (Figure 3). The sonar device takes a new measurement every 50 ms (20 Hz). Each square within the sonar beam pattern represents approximately three feet. The sonar will be capable of connecting directly to the A/D Converter. No diagram is necessary to demonstrate this connection.

NOTE: Pin outs for the sonar device listed below are printed directly onto the board.

[pic]

Figure 4: (From Left to right) Sonar beam pattern, Pin connections, and sonar sensing device

|Pin |Description |

|GND |Return for the DC power supply. GND must be ripple and noise free for best operation. |

|+5 Vcc |Operates on 2.5V - 5.5V; recommended current capability of 3mA for 5V, and 2mA for 3V. |

|TX |When the BW is open or held low, the TX output delivers asynchronous serial with an RS232 format,|

| |except voltages are 0-Vcc. |

|*Brown dot parts: |When BW pin is held high the TX output sends a single pulse, suitable for low noise chaining (no |

| |serial data). |

|RX |This pin is internally pulled high. The sonar will continually measure range and output if the RX|

| |pin is left unconnected or held high. If held low, sonar will stop ranging. Bring high 20uS or |

| |more for range reading. |

|AN |Outputs analog voltage with a scaling factor of (Vcc/512) per inch. A supply of 5V yields |

| |~9.8mV/in. and 3.3V yields ~6.4mV/in. The output is buffered and corresponds to the most recent |

| |range data. |

|PW |This pin outputs a pulse width representation of range. To calculate distance, use the scale |

| |factor of 147uS per inch. |

|BW |Leave open or hold low for serial output on the TX output. |

5 Microphone

The third input that will interface with the LED system is the microphone. A standards off the shelf microphone will be utilized to accomplish this.

TRS connector

A TRS connector is a common audio connector. Stereo 3.5 mm jacks are used for microphone input. (5v power available on the ring)

Usage

[pic]

Figure 5: Microphone Wiring

Most devices use a "plug-in powered" microphone

[pic]

This is a three-conductor, or a TRS jack. The upper connector is the tip, as it is farther away from the sleeve. The sleeve is connected directly to the chassis. This is the typical configuration for a balanced connection.

Frequency response

There are two types of frequency response for microphone.

Flat frequency response

[pic]

Figure 6: Flat Frequency Response.

Figure 4 shows the frequency response for a flat frequency response microphone. The frequency is given in a logarithmic scale on the x axis, with the response in decibels (dB) in the y direction.

This graph shows the frequency response for microphone is flat over the 50 ~ 15 kHz. It reproduces a variety of sound without changing the original sound. Values above 15kHz are unnecessary, since they are either difficult to hear, or inaudible.

Shaped frequency response

[pic]

Figure 7: Shaped Frequency Response.

This graph shows that microphone may have a peak in 2 ~ 8 kHz range to increase intelligibility for live vocals. This kinds of response is designed to improve audio response while removing some of the undesirable noise in a noisy environment.

The ISSC will utilize the shaped frequency response microphone. A standard 3.5mm jack will be used that is already directly integrated into the computer system.

6 RFID

The ISSC will utilize a model IF5 Fixed Reader for reading RFID Signals. The IF5 Fixed Reader provides wired or wireless connection between tag data and a system.. Wired connection will be utilized for simplicity for this device.

[pic]

Figure 8: RFID Back

|Port |Description |

|AC Power port |AC power source. The appropriate power cord is included. |

|Ethernet port |10BaseT / 100BaseTx port. Connects directly to an Ethernet port on the computer or within a |

| |switch or router. |

|Serial port |RS-232 null modem cable (P/N 059167). Connect the reader to a PC for configuration. |

|Control port |Input / output (GPIO) port. This port is connected the reader for industrial control: relays or |

| |indicators. Also this port includes optically isolated inputs, optically isolated low voltage DC |

| |outputs and access to 12 VDC. |

[pic]

|LED Icon |LED Name |Description |

|[pic] |Power |Remains on after the IF5 boots. |

|[pic] |Wireless communication |Flashes when a frame is transmitted or received on the 802.11g radio. |

|[pic] |Wired LAN |Flashes when a frame is transmitted or received on the Ethernet port. |

|[pic] |Intermec Ready-To-Work Indicator |Blue LED remains on when an application is communicating with the data |

| | |collection engine on the IF5. Blinks when no application is communicating|

| | |with the collection engine. |

[pic]

Figure 9: The reader, IF5, connected to 802.11g network.

Figure 10: RFID server through the wired network

The reader, IF5, connects to 802.11g network. The reader can communicate with the access point and receive data from the RFID server (Figure 8). The reader can also communicate via a wired land area network (LAN) (Figure 9).

How to set up the reader

[pic]

The IF5 can be horizontally or vertically placed on a stable surface, or mounted to a wall.

Environmental requirement

|Type |Minimum |Maximum |

|Operating temperature |-25°C (-13°F) |55°C (131°F) |

|Storage temperature |-30°C (-22°F) |75°C (167°F) |

|Humidity |10% |90% |

IF5 Specification

|Height |9.5 cm |

|Length |35.5 cm |

|Width |23.6 cm |

|Weight |23.6 cm |

|AC electrical rating |2.63 kg |

|AC electrical rating |~ 100 to 240V, 1.0 to 0.5A, 50 to 60Hz |

|Ethernet interfaces |10BaseT / 100BaseTx |

|Ethernet compatibility |Ethernet frame types and Ethernet addressing |

|Ethernet data rate |10 Mbps / 100 Mbps |

|Radios supported |802.11g |

|Serial port maximum data rate |115.200 bps |

RFID Specification

|Frequency Range |865 ~ 868 MHz, 869 MHz, 915 MHz |

|Output power | |

|865 ~ 867 MHz, 915 MHz |Minimum: 28.5 dBm |

| |Typical: 29.5 dBm |

| |Maximum: 30.0 dBm |

|869 MHz |Minimum: 25.5 dBm |

| |Typical: 26.5 dBm |

| |Maximum: 27.0 dBm |

|Occupied frequency bandwidth | ................
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