## 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](https://patents.google.com/patent/US8035514B2/en) ### 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](http://www.security.honeywell.com/hsc/products/sensor/mo/vplex/263626.html) / [IS2500SN](http://www.security.honeywell.com/hsc/products/sensor/mo/vplex/263620.html) * 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 * [Vx520 Sprocket](http://www.verifone.com/PDF/VX520_Acq_Ltr.pdf) (Primary OS driver developer) * [Vx680 WiFi/Bluetooth](http://www.verifone.com/PDF/VX680_Acq_Ltr.pdf) (Primary OS driver developer) * Verix OS ### 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 - 2024) ### 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 * Technical Leadership ### 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 verification ### 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 ### Technical Leader for in-house engineering division * Oversaw technical execution * Business Development * Primary advisor to division leadership ## Sierra Space (2024 - Present) ### Product Contributions * Satellite system for custom payload ### General Duties * C/C++ firmware development on satellite systems * BSP and driver development (C, embedded Linux) * Flight software component development (C++17) ### Verified, updated, and fixed vendor BSP for PowerPC 8548 * C Linux drivers ### Wrote driver for standalone ADCS module (Tensor) * C++ software module to command ADCS module and retrieve status ### Architectural software design of HWIL simulation system * Planning and documentation of HWIL simulation approach * C++ development of drivers and simulation modules ## 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](https://github.com/jotux/Steward-Platform-Forward-Kinematics-Solver) ## 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) * http://jotux.github.io/fangle/ ### Created proof-of-concept app to visual display GCC linker map files (javascript) * http://jotux.github.io/GccMapVisualizer/ ### Designed Sentry Robot For defcon 15/16 robot contest (DEFCONBOTS) * Robotic shooting gallery robot to shoot down targets as fast as possible * 15 * [Screenshot of software](https://github.com/jotux/HaveDone/raw/master/img/bot29b.png) * [First Version](https://github.com/jotux/HaveDone/raw/master/img/bot29.jpg) * [Video of Pan-tilt system](http://www.youtube.com/watch?v=6BDaiTIeJFQ&list=UUIRt6onLVr6kQqrAGQUXr_Q&index=13&feature=plcp) * [Video of custom hopper I machined for first version](http://www.youtube.com/watch?v=Lcp9O3q8qRk&list=UUIRt6onLVr6kQqrAGQUXr_Q&index=15&feature=plcp) * [Video of development](http://www.youtube.com/watch?v=XiPxKCMyNRM&list=UUIRt6onLVr6kQqrAGQUXr_Q&index=11&feature=plcp) * [Video of competition](http://www.youtube.com/watch?v=qNHM4yJPc9o&list=UUIRt6onLVr6kQqrAGQUXr_Q&index=12&feature=plcp) * 16 * [Pic1](https://github.com/jotux/HaveDone/raw/master/img/bot19.jpg) * [Pic2](https://github.com/jotux/HaveDone/raw/master/img/bot20.jpg) ### 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 * Co-founded on-campus robotics enthusiast club (Competitive Robotics @ CSUS) * Designed 360-degree robotic camera platform * [Model](https://github.com/jotux/HaveDone/raw/master/img/cambot.JPG) * [Finished Robot](https://github.com/jotux/HaveDone/raw/master/img/cambot3.JPG) * Designed electro-ocular PC mouse replacement (senior project) * Super-Heavyweight battlebot (340 lb) * [Video of competition](http://www.youtube.com/watch?v=tXloMf5v4C4&feature=autoplay&list=UUIRt6onLVr6kQqrAGQUXr_Q&lf=p)