Team Members: Alexandra Peruzzini Duncan Topley Obinna Ukachukwu

Transcription

1 Team Members: Alexandra Peruzzini Duncan Topley Obinna Ukachukwu Advisor: Prof. George Slack Project Sponsors: Mr. David Perlman Harris Corp. Mr. Bryce Tennant & Mr. Tony Keane

2 Develop two short-range communication devices that alert at close proximity. o Using the RSSI (Receive Signal Strength Indicator ) from RF (Radio Frequency) determine distance of two communication devices. Prove concept to be further developed by future MSD team.

3 Customer Need # 1.a 1 Importance Description Comments/Status A safe stimulus that will slowly increase in annoyance as the cat moves closer to another cat. 1.b A safe stimulus In Fall (20101) research was done for investigating possible cat stimuli. References can be made to this document to further design. Nothing should harm any cats in the making of this device 2 2 Device can be switched on and off Possibly remote on and off 3 1 The range must be wide enough to annoy the cats before they are close enough to hurt one another 4 2 This device must be able to fit on a cat collar 5 2 A cat must be able to move comfortably with this device around its neck. This is a loose signal range. Possible changes to this range can be made per discussion with Dr. Perlman. 8 2 Weather-resistant John Bonzo, Brinkman Lab 9 2 Device must have acceptable maintenance practices (i.e. battery life cycle, inoperative notice, power on/off, power save) Stimulus defined. Audible range, pitch, tone for the device. SPL meter in necessary 11 2 Notify cat owner of needed maintenance (i.e. low battery, inoperative) If one device goes off, the other goes off as well (handshake model) 13 1 Device must keep from misfiring 14 1 After a period of time, the device resets. Sound of collar may be enough. Home testing station? Keeps both cats equal with level of annoyance

4 Customer Need # Importance Description Comments/Status 1.a 1 A safe stimulus that will slowly increase in annoyance as the cat moves closer to another cat. In Fall (20101) research was done for investigating possible cat stimuli. References can be mad to this document to further design. 1.b A safe stimulus Nothing should harm any cats in the making of this device 2 2 Device can be switched on and off Possibly remote on and off The range must be wide enough to annoy the cats before they are close enough to hurt one another Device must have acceptable maintenance practices (i.e. battery life cycle, inoperative notice, power on/off, power save). This is a loose signal range. Possible changes to this range can be made per discussion with Dr. Perlman Stimulus defined. Audible range, pitch, tone for the device. SPL meter in necessary 11 2 Notify cat owner of needed maintenance (i.e. low battery, inoperative). Sound of collar may be enough. Home testing station? 12 2 If one device goes off, the other goes off as well (handshake model) 13 1 Device must keep from misfiring Keeps both cats equal with level of annoyance 14 1 After a period of time, the device resets.

5 Engr. Spec. # Importance Source Specification (description) Unit of Measure Ideal Value Comments/Status Size of device for Cat Collar Inches 0.8"x1"x0.5" Generic Collar at any pet store Range of device Feet 5'-25' Battery Life Cycle (power/hour) w/hour TBD Audible range of device db 45Hz - 64KHz a Safe Stimulus Binary Sound Weight of Cat Collar with device oz b Sound Pattern (.wav file or recording) Binary b Volume Range upper db TBD b Volume Range lower db TBD Turning device on/off Binary Making the device weather-resistant (dealing with humidity,moisture, dir, etc...) Indicator for needed maintenance Binary Light -> Working battery Annoyance level for cats TBD Algorithms b Stimulus will increase in speed Binary Battery Life cycle can be determined Binary Device resets after a period of time, prevents misfires Binary Alert for if the cats start fighting Binary Need SPL Meter, this range includes human range Possibly multiple sounds (at different frequency) at once Can be switch (hardware) or built into algorithm Device housing LED and Test Sound This can be determined through testing, use of Audacity

6 Engr. Spec. # Importance Source Specification (description) Unit of Measure Ideal Value Comments/Status Range of device Feet 5'-25' Battery Life Cycle (power/hour) w/hour TBD Audible range of device db 45Hz - 64KHz a Safe Stimulus Binary Sound b Volume Range upper db TBD b Volume Range lower db TBD Turning device on/off Binary Indicator for needed maintenance Light -> Working battery Annoyance level for cats TBD Algorithms b Stimulus will increase in speed Binary Need SPL Meter, this range includes human range Can be switch (hardware) or built into algorithm LED and Test Sound This can be determined through testing, use of Audacity Battery Life cycle can be determined Binary Device resets after a period of time, prevents misfires Binary Alert for if the cats start fighting Binary

7 The Transmit (Tx) and Receive (Rx) functions of the CC430 Development Kit were tested using the Texas Instruments (TI) software, RF Studio. This test was performed to analyze the Tx & Rx capabilities of the CC430. The test was performed in 3 different ways: o 2 Dipole Antennas (Tx and Rx) o 1 Dipole Antenna (Rx) o No antenna (Tx and Rx)

8 dbm db Test 2 Dipole Antennas One Dipole Antenna (Rx) No Dipole Antennas Distance (ft) Figure 1: MATLAB plot of average dbm levels for development boards (indoors)

9 dbm -30 db Test Tx Power 0 Tx Power Distance (ft) Figure 2: MATLAB plot of average dbm levels for development boards (outdoors)

10 dbm Figure 3: MATLAB plot of average dbm levels for development boards (outdoors) dbm Over 100 Packets Number of Packet Tx

11 Conclusion o From the test data in Figure 1, it is necessary for our purposes to have two antennas o From the test data in Figure 2, the consistency of the two dbm levels for two different Tx powers shows a very distinct accuracy in our device As seen in Figure 3, the preciseness in the dbm allows for the slight linear nature of distance versus dbm to be sufficient.

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13 Timer Interrupts o Maintain system in battery saving mode o Break batter saving mode after a set period of time Rx Interrupts o Maintain system in battery saving mode o Break battery saving mode for a successful receive o Maintain ability to receive at all times Except for when transmitting Port Mapping o Strobe LED o Output digital signal

14 // Chipcon // Product = CC430Fx13x // Chip version = C (PG 0.7) // Crystal accuracy = 10 ppm // X-tal frequency = 26 MHz // RF output power = 0 dbm // RX filterbandwidth = khz // Deviation = 19 khz // Datarate = kbaud // Modulation = (1) GFSK // Manchester enable = (0) Manchester disabled // RF Frequency = MHz // Channel spacing = khz // Channel number = 0 // Optimization = - // Sync mode = (3) 30/32 sync word bits detected // Format of RX/TX data = (0) Normal mode, use FIFOs for RX and TX // CRC operation = (1) CRC calculation in TX and CRC check in RX enabled // Forward Error Correction = // Length configuration = (0) Fixed packet length, packet length configured by PKTLEN // Packetlength = 61 // Preamble count = (2) 4 bytes // Append status = 1 // Address check = (0) No address check // FIFO autoflush = 0 // Device address = 0 // GDO0 signal selection = ( 6) Asserts when sync word has been sent / received, and de-asserts at the end of the packet // GDO2 signal selection = (41) RF_RDY

15 Are we too close? I don t hear anything

16 The output of the speaker as driven by the CC430 is 1kHz and a duty cycle of 50% Video of proof of concept

17 Beep! Beep Beep!! Schematic(L) and Circuit(R) of CC430 and Speaker

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19 Creating a PCB board o Deciding on either PCB or Chip antenna Choosing appropriate battery Design appropriate casing for chip Revise Algorithm Stimulus o Obtain a specific stimulus that will safely deter cats from one another

20 Professor George Slack Mr. David Perlman Harris Corporation o Mr. Bryce Tennant o Mr. Tony Keane