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EE 296 Icarus Project Group Members: JimyLeah Castro Jeremy Chan Eric Lee Sae Yoon Project Overview Use a Zilog Microcontroller to handle telemetry Multiplex several sensor readings via communications channel Transmit data wirelessly Overview of Initial Engineering Objectives

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ee 296 icarus project group members jimyleah castro jeremy chan eric lee sae yoon
EE 296 Icarus Project

Group Members:

JimyLeah Castro

Jeremy Chan

Eric Lee

Sae Yoon

project overview
Project Overview
  • Use a Zilog Microcontroller to handle telemetry
  • Multiplex several sensor readings via communications channel
  • Transmit data wirelessly
overview of initial engineering objectives
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
design structure circuit schematic
Design Structure – Circuit Schematic

Battery Feedback

Circuit

Power Supply Circuit

MAXStream9 RF

Modem

GPS

Module

Zilog Encore

Microcontroller

Crystal

Oscillator

Circuit

Temperature

Sensor

Debug/Programming

Port

Motorola Pressure Sensor

and Attenuator Circuit

design structure circuit modules
Design StructureCircuit 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
design features
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
challenges encountered
Challenges Encountered
  • Programming Limitations
  • Proprietary Serial Protocol Implementation
  • High Power Consumption
  • Scheduling Conflicts
  • Vibrations Affect Pressure Readings
message formats
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
outstanding problems
Outstanding Problems
  • SHT11 Scrapped
  • GPS: Unable to Acquire GPS Fix Reliably
future improvements
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