Giters

jotux / HaveDone

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Honeywell (2007-2010)

Product Contributions

  • IS2500SN (Primary firmware developer)
  • DT7500SN (Primary firmware developer)
  • DTPI8M (Primary firmware developer)

General Duties

  • C firmware development on MSP430
  • C# utility development
  • Python/Javascript scripting for misc. tool support

Experiment to determine feasibility of resistance to bright incandescent light

  • Multiple circuit/software/mechanical experiments performed
  • Formal report written and presented to peers
  • New method discovered
  • Implemented new method in all sensors under development at the time
  • Allowed products, for the first time, to be sold in Russian markets
  • Granted patent US8035514B2

Investigated method to record and simulate motion detector algorithms (Walk-Test Simulator)

  • Created database of sensor samples
  • Developed C# application to run different algorithms on the data set and visualize the output
  • Developed C# framework to interface with LabJack USB DAQ hardware for signal injection
  • Developed C# framework to inject pre-recorded walk-test signals

Developed visual real-time debugging application for sensors

  • Developed Packet format to be used over RS232 port
  • Developed C# application to visualize data in real-time
  • Improved SQA and helped to identify bugs

Investigated CR123 battery performance issues

  • Created circuit interfacing relays to controller board and had it manufactured
  • Developed firmware to output sample data to logging PC
  • Developed C# application to parse and log data to a database
  • Developed Ruby script to parse data and host a local webserver with data visualization (google visualization API)
  • Determined batteries from some manufacturers had critical performance issues

Investigated clock jitter performance issue

  • Setup experiment comparing clock jitter among several controller platforms (TI MSP430 vs PIC18 vs Atmel ATMega)
  • Correlated clock jitter to microwave performance degradation

Investigated dropped wireless packet issue

  • Setup experiment with varying number of sensors and broadcast periods
  • Developed C# logging application to interface with proprietary security panel
  • Logged and time-stamped received packets
  • Determined packet loss could be attributed to RF collision for sufficiently large installations

Investigated alarm latching issue

  • Evaluated hardware problem related to alarm relays latching too long
  • Simulated circuit in spice
  • Performed smoke analysis on circuit
  • Determined that when all components varied (within tolerance) they could latch the drive transistor
  • Suggested circuit/component change to fix problem

Investigated use of LED as light detection source

  • Created sample hardware/firmware
  • Showed working prototype

Developed firmware for motion detectors

  • Power-over-network motion detector DT7500SN / IS2500SN
  • EMEA wireless motion detector (DTPI8m)
  • Developed new algorithm for immunity to noisy fluorescent lights
  • Developed low-power framework (<50uA) to extend battery life to > 4 years on devices

Verifone (2010-2012)

Product Contributions

General Duties

  • C firmware development on proprietary financial terminal OS (ARM1176 with security Enclave)
  • C# utility development
  • Ruby/Python/Javascript scripting for misc. tool support

Developed dot-matrix printer driver Vx520 Sprocket

  • Driver to efficiently run printer hardware within specification
  • Developed C# simulator application to simulate printer-head motor-control timing and troubleshoot driver issues

Ported 802.11b/g driver for BCM4329 from linux to proprietary OS for Vx680 WiFi/Bluetooth

  • Identified necessary changes and created development strategy
  • Created test applications to interface directly with driver and test essential hardware
  • Worked with library development team to create user-level interfaces
  • Worked with test engineers to develop tests for Wifi-Alliance certification

Merged build and authentication tools into source controlled environment

  • Moved all build/authentication/signing tools into single "tools" git repository
  • Developed batch files to automate installation and easy switching between tool versions
  • Synchronized version tracking of tools with projects such that tool versions and releases were correlated
  • Created scripts to make pulling/building projects a single-step
  • New developer bring-up time dropped from days to ~15 minutes

Migrated OS team from legacy source control management system to modern DVCS(git)

  • PVCS to Git
  • Developed Ruby script to automate database conversion
  • Mentored team members
  • Hosted training sessions
  • Worked with management to ensure seamless transition -- no developer down-time

Developed helper utilities to automate tedious build and release processes

  • Developed Ruby script to automate release note extraction from git log
  • Developed Ruby script for "smart" project directory cleaning
  • Added commit-template feature to Git Extensions (open source project)

Setup continuous integration server and automated build system

  • Researched and purchased server machine and CI software systems
  • Configured Jenkins CI software with multiple-level email reporting
  • Developed C# email bot that could build specified versions and reply with binary
  • Configured VNC software for secure remote file signing

DMEA (2012 - Present)

Product Contributions

  • PCMCIA/USB Data Transfer Device for Avionics (Primary firmware developer -- used on C-5/C-130/F-22)
  • Milstar Time Synchronization Module (Primary firmware developer)
  • USB 3.0 Data Transfer Module for Avionics (Technical team lead, firmware team member -- F-15)
  • Numerous battery-operated SATCOM transmitter modules (Program lead)

General Duties

  • C++ firmware development on ARM Cortex-M microcontrollers
  • C# utility development
  • Python/Javascript scripting for misc. tool support
  • Program/Growth/Partnership management

Developed configuration application for numerous custom embedded device

  • C# GUI to read/write device configuration for embedded devices

Created tool to automated microcontroller/CPLD programming and testing

  • Detect each programming interface
  • Erase-Program-Test each device
  • Trigger SATCOM transmits and verify message receipt on back-end server to end-to-end verificiton

Created unit test framework for embedded software

  • Implemented on IAR compiler/simulator
  • Created parser to output results to junit compatible format readable by CI server

Architectural hardware design and firmware design of dual-interface data storage device for C-5

  • PCMCIA and USB mass storage
  • C++ firmware on ARM Cortex-M3 (LPC18xx)

Architectural hardware design and firmware design of high-performance data storage device for F-15

  • Embedded Linux on ARM Cortex A8 (ATSAMA5D36)
  • C Firmware on ARM Cortex M0 (LPC824)
  • Architected hardware design over ~12 months to meet vigorous requirements
  • Worked to bring up embedded linux with <3 second boot time
  • 512GB SSD, 64MB DDR RAM disks, configuration interface over USB2.0/3.0

Team lead and principal firmware developer on numerous bespoke SATCOM modules

  • ST STM32 L4/F7/H7
  • Custom, ultra-small, and ultra-low-power (<1uA), battery-operated SATCOM modules
  • Lead a multi-disciplinary team of 12+ HW/SW/test/mechanical engineers to deliver products on short timelines

Torpedo (Consultant, 2006 - Present)

Developed controller for networked pan-tilt cameras (OnScene Systems, 2008)

  • Schematic capture/layout for handheld controller, central routing and camera controller
  • Developed firmware for controller signal routing (ATmega32)

Developed controller for automated cat-litter cleaning machine (Litter Revolution, 2010)

  • Schematic capture/layout for machine controller
  • Developed firmware (UI, motor control, audio indication, safety)

Developed Controller and infrastructure for research-grade modular robot (Barobo iMobot, 2011)

  • Schematic capture/layout for central controller, sensors, and peripheral connector boards
  • Worked with mechanical engineer to ensure placement and compatibility with mechanical housing
  • Developed three-layer hardware platform: Sensor(MSP430) <-> (Hardware Controller)ARM Cortex-M3 <-> (Master Controller)OMAP 3530
  • Developed custom multi-master I2C protocol to allow transactions between each layer
  • Wrote hardware drivers for device bring-up
  • http://www.barobo.com/

Firmware for IR LED biomedical device (Photon Inc/HealthLight, 2015-2021)

  • Version 1
    • PSOC
    • Firmware for 4-port controller and single controller
    • C
  • Version 2
    • LPC8xx/LPC15xx
    • Added overcurrent/short detection
    • C++
  • Version 3
    • ATSAMD21
    • C++

NASA (Summer internship, 2006)

  • Researched high efficiency closed-form solution to the forward kinematics of the NASA Contact Dynamics Simulation Laboratory six-DOF Stewart platform.
  • Developed and programmed solution algorithm (MATLAB)
  • Project

Just for fun

Created web app to expand C macros

  • Used for macro debugging
  • ASP.net and python

Created proof-of-concept app to generate interactive pages from plaintext (coffeescript)

Created proof-of-concept app to visual display GCC linker map files (javascript)

Designed Sentry Robot For defcon 15/16 robot contest (DEFCONBOTS)

Designed and hosted robot laser contest for defcon 22/23 (DEFCONBOTS)

  • Defconbots.org
  • Hardware design of targets
  • Firmware for targets
  • Contacted sponsors and got ~$3000 in prizes donated
  • 22
    • MSP430G2452 and standalone targets
  • 23
    • LPC824 with zigbee connection to targets
    • Wrote application to communicate with targets and run contest from laptop (C#)

CSUS

  • Designed step-up voltage converter
  • Cofounded on-campus robotics enthuist club (Competitive Robotics @ CSUS)
  • Designed 360-degree robotic camera platform
  • Designed electro-ocular PC mouse replacement (senior project)
  • Super-Heavyweight battlebot (340 lb)

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