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EE 296 Icarus ProjectGroup Members:JimyLeah Castro
Jeremy ChanEric Lee
Sae Yoon
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Project Overview
• Use a Zilog Microcontroller to handle telemetry
• Multiplex several sensor readings via communications channel
• Transmit data wirelessly
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Overview of Initial Engineering Objectives
• Interface with sensors
• Utilize a radio system
• Design a portable device
• Create a custom printed circuit board
• Apply theoretical concepts
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Overall Design
Block Diagram
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Design Structure – Circuit Schematic
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Design Structure – Circuit Schematic
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Design Structure
Circuit Modules
• Power Supply (5V, 3.3V)• Zilog 40 Pin 64KB Flash Microcontroller• MAXStream9 RF Modems• Microchip TC1074A Temperature Sensor• Lassen IQ+ GPS• MPX4115A Motorola Pressure Sensor• LM324 Operational Amplifier• Ultra Low Power Attenuator Circuits
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Initial Prototype
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Final Prototype
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Final Design Status
Modules Tested Software
Driving
Integration
Power Supply – 3.3V, 5V
Zilog Z8 Encore! Flash Microcontroller
MAXStream9 RF Modem - OEM
Microchip TC1074A Temperature Sensor
GPS
MXP4100A Motorolla Pressure Sensor w/ Analog Support System
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Design Features
• Bidirectional Communication – full duplex command and telemetry via wireless
• Power Trim Mode – hibernate the radio in order to cut power consumption by 33%
• Low Battery Detection and Response
– automatic power trimming, warnings
• Attenuator Circuits – to scale voltages with high accuracy and low power consumption
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Challenges Encountered
• Programming Limitations
• Proprietary Serial Protocol Implementation
• High Power Consumption
• Scheduling Conflicts
• Vibrations Affect Pressure Readings
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Data via Telemetry
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Icarus Diamond Head Telemetry
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Data via TelemetryDiamond Head Hike, 12/26/2006
0
20
40
60
80
100
1 1883 3765 5647 7529 9411 11293 13175 15057 16939 18821
Pressure
Temperature C
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Message Formats• Sensor Data
– $DAT:76.1,F,24.5,C,100.421,kPa,8.29,V*
• GPS Data (NEMA 0183 Standard)– $GPGGA,034944.00,2116.3475,N,15748.0174,W
,1,03,2.38,00089,M,004,M,,*73
• System Status Messages– $STAT_BATT,7.33,V,LOW-BATT-TRIM-MODE-
ACTIVATED*– $STAT_BATT,7.38,V,LOW-BATT*
• NEMA style messages allow for easy reading and data filtering
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Outstanding Problems
• SHT11 Scrapped
• GPS: Unable to Acquire GPS Fix Reliably
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Future Improvements
• On-board Data Logging via Flash Device
• Additional Sensors
• Implement remote control devices
• Higher Resolution ADC for Pressure
• Space Reduction
• Power Optimization
• Data Checksum Implementation
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Final Design Demonstration
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Thank You