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Andrew Tridgell

PROFILE

Andrew Tridgell

Andrew Tridgell developed and maintained core flight control, scripting, and hardware integration features for the ArduPilot/ardupilot repository over 17 months. He engineered robust solutions for CAN bus communication, memory management, and automated testing, delivering over 100 features and nearly 50 bug fixes. His work included integrating Lua scripting for telemetry and diagnostics, optimizing build systems for cross-platform reliability, and enhancing safety-critical behaviors such as arming checks and battery management. Using C++, Python, and embedded systems expertise, Andrew consistently improved code maintainability, runtime stability, and developer productivity, demonstrating deep technical understanding and a methodical approach to complex aerospace software challenges.

Overall Statistics

Feature vs Bugs

69%Features

Repository Contributions

244Total
Bugs
47
Commits
244
Features
104
Lines of code
14,849
Activity Months17

Work History

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026: Delivered CAN Playback Tool Filtering for ArduPilot/ardupilot, enabling targeted replay of CAN messages by DroneCAN source node and message IDs. This feature improves debugging efficiency and data analysis for CAN workflows; includes a focused commit to extend the CAN playback utility.

January 2026

1 Commits • 1 Features

Jan 1, 2026

January 2026: Delivered a focused cleanup in ArduPilot/ardupilot by removing the RC over network capability in the AP_Periph module. The change reverts the prior RC networking addition, eliminating initialization and update paths for network-based RC inputs and removing the associated class and methods. This streamlines the codebase, reduces maintenance burden, and aligns with the project’s stability and security goals.

December 2025

5 Commits • 3 Features

Dec 1, 2025

December 2025 monthly summary for ArduPilot/ardupilot focusing on reliability, stability, and onboarding improvements across firmware loading, motor control, quadplane landing, scripting clarity, and macOS prerequisites.

November 2025

6 Commits • 3 Features

Nov 1, 2025

November 2025 performance summary for ArduPilot/ardupilot. This period focused on delivering high-impact features, improving safety-critical behavior, and slimming the production footprint for faster, more reliable field operation. Business value was achieved through faster data transfers, safer arming workflows, and leaner runtime.

October 2025

1 Commits • 1 Features

Oct 1, 2025

Monthly summary for 2025-10: Focused on repository hygiene in ArduPilot/ardupilot by removing an outdated build link in build_sizes.py. This cleanup reduces confusion in build metadata and helps CI stability moving forward. No major bugs fixed this month; effort concentrated on maintainability and clarity.

September 2025

2 Commits • 1 Features

Sep 1, 2025

September 2025: Delivered reliability and data-acquisition enhancements for AP_Scripting in ArduPilot. Key work includes a memory-leak fix in the socket receive path that now allocates via the Lua heap, eliminating global leaks during allocation failures and boosting robustness under load; and the introduction of BatteryTag support on a second CAN bus for AP_Scripting, expanding cross-bus data reception and improving data acquisition resilience. These changes reduce runtime crashes, improve data integrity, and enable more versatile telemetry in dual-CAN configurations. Core commits: 691e559db44ec044ca4f46ac49f3cf495d9d900f and a3041bd10f8b62e8157dbf68e55783577a8096c9.

August 2025

19 Commits • 6 Features

Aug 1, 2025

August 2025 (ArduPilot/ardupilot) delivered high-value flight features, reliability improvements, and expanded testing/telemetry capabilities. The results strengthen safety and operational resilience while enabling richer telemetry and testing workflows. Key features delivered: - CAN frame playback with Lua scripting support and extended DroneCAN frame transmission to support bus playback scenarios using logged CAN frames (CAN_playback.lua). - VTOL/quadplane arming and recovery improvements, including an in_recovery flag on the roll controller and an option to disable IMU consistency checks while ICE runs to improve arming under noisy conditions. Major bugs fixed and robustness improvements: - Parameter handling robustness and concurrency: fixed initialization of flags in AP_Param find() and mitigated data races by hiding parameters during loading to ensure correct visibility. - Build stability and SITL tooling adjustments to suppress non-fatal warnings and resolve SITL build issues. Enhancements to telemetry and logging: - Enhanced blackbox logging for FlightCoach with new BBX1/BBX2 logs and a dedicated Log_Write_Blackbox function to improve telemetry display. Networking and connectivity: - Networking and LTE reliability improvements including non-blocking TCP, pending checks, timeout handling, LTE CMUX/CPSI resilience, is_pending socket methods, RSRQ/RSRP fixes, and a 3-second TCP connect timeout for more robust remote operations. Testing and simulation: - SITL simulation tuning (motorboat throttle normalization -1 to 1) and autotest site expansion with ANUSC coordinates for Lake Burley Griffin. Overall impact and business value: - Increased safety and arming reliability in environments with noisy sensors, richer telemetry for diagnostics, more robust networking in variable conditions, and improved SITL testing fidelity. These changes reduce operational risk, accelerate debugging, and enable more reliable mission execution. Technologies/skills demonstrated: - Lua scripting integration and DroneCAN enhancements, AP_Param concurrency fixes, advanced logging (BBX), SITL tuning, and networking stack hardening (non-blocking I/O, timeouts, LTE handling).

July 2025

18 Commits • 6 Features

Jul 1, 2025

July 2025 performance for ArduPilot/ardupilot focused on flight stability, reliability, and tooling modernization. Key stability and reliability improvements include a TECS oscillation fix by quantizing the airspeed target from MIN_GROUNDSPEED with hysteresis to stabilize flight performance, and a NaN-safe approach later? (not in top 5). In addition, architectural refinements and tooling enhancements broaden GCS capabilities and debug visibility: a GCS File Transfer Architecture Refactor that splits FTP into its own GCS_FTP class and enables multiple MAVFTP sessions for robust transfers; LTE modem defaults with safe no-change settings and BG95 support to expand connectivity options; GCS Identification and Validation Hardening with a new GCS SYSID validation path to improve failsafe reliability; and Network Packet Capture for Debugging (SITL) to diagnose Ethernet/PPP traffic. The work also included documentation updates for quadplane ship landing Lua script and ongoing dependency/build system improvements to ensure compatibility and performance. These efforts collectively improve flight stability, safety, observability, and developer productivity, reducing risk and accelerating issue resolution.

June 2025

27 Commits • 14 Features

Jun 1, 2025

June 2025 — ArduPilot/ardupilot delivered significant connectivity, scripting, and release-readiness progress. Key outcomes include LTE modem driver integration for SIM7600 with PPP support and LTE_OPTIONS (renamed LTE_modem) and CMUX-based enhancements for broader chipset support; cross-board ROMFS Lua script compatibility and deduplication fixes; SITL/peripheral improvements enabling permanent serial passthrough, SITL serial registration, and glider set_pose control; networking improvements with PPP robustness and multi-link support; and stability fixes including MAVCAN mutex ordering and scripting-then-networking initialization. These efforts improve cross-board reliability, reduce operational risk, and accelerate the 1.9.0-dev release." ,

May 2025

17 Commits • 6 Features

May 1, 2025

May 2025 performance summary for ArduPilot/ardupilot: Delivered substantial hardware and software improvements that enhance safety, reliability, and developer productivity. Key work focused on battery hardware integration, expanded sensor support, concurrency safety, and build/tooling reliability, driving broader hardware compatibility and faster iteration cycles. Strengths demonstrated include end-to-end feature delivery, cross-repo collaboration, and effective escalation of race-condition fixes. Technologies leveraged included DroneCAN, AP_Scripting with Lua, hardware definitions, and build tooling (waf, ccache).

April 2025

31 Commits • 9 Features

Apr 1, 2025

April 2025 delivered robust attitude and terrain improvements across SITL, autopilot planes, and peripheral integrations, with expanded automated testing and safer defaults. Key features delivered include SIM_IMU_ORIENT support in SITL and AP_InertialSensor; Plane attitude and terrain enhancements; and Autotest expansions with SRTM tiles and expanded qguided terrain tests. Major fixes addressed AHRS initial attitude for non-zero AHRS_ORIENTATION, prevention of direct terrain_alt/relative_alt flag manipulation, and improved terrain/altitude logic across AP_Common and plane code. Additional work improved build stability and hardware defaults (BTAG battery info, SITL periph battery info, and safe BATTERY_TAG/GLOBALTIME defaults). Overall this work increases simulation realism, safety in terrain decisions, and automated validation, delivering tangible business value through more reliable autopilot behavior and faster verification across subsystems.

March 2025

29 Commits • 12 Features

Mar 1, 2025

March 2025 (2025-03) monthly summary for ArduPilot/ardupilot: Delivered substantive stability and reliability improvements across flight stacks, enhanced estimator and control loops, expanded SITL and autotest coverage, and improved build-time configurability for Plane. Key outcomes include improved estimation stability, safer VTOL and plane operations, broader autopilot test coverage, and clearer maintainability through targeted code and documentation fixes.

February 2025

10 Commits • 7 Features

Feb 1, 2025

February 2025 — ArduPilot/ardupilot Key features delivered: - SYSTEMID Auxiliary Switch Support: Adds mapping of a SYSTEMID function to an auxiliary switch in RC_Channel. Commit ca723dc2aad74ed8cf435d94caada3e563ba5c15. - Dynamic XY Control Scale Factor Tuning: Introduces set_xy_control_scale_factor in the attitude control library for dynamic tuning of XY gains during position-controlled modes. Commit e9ac6bd2692ebcbe9b60274f20ab60f97fe7f666. - UBLOX GPS Configuration Improvements: Refactors and optimizes configuration (disable CONFIG_RATE_SOL when PVT data is available, NULL-pointer protection during VALSET, and reduced configuration delay). Commits 69c540a0defcbc5547a3cd9dc2a81b989930e2e0; 500d190df3c73be30f40ead82a084e8f2a77fdcb; e2fc648cb013779680da4016e9995afb6bdcc22f. - DroneCAN Messaging in Lua Scripting: Adds send/broadcast, subscriptions, and data requests for DroneCAN in Lua, plus usage example. Commits 4a442d3b20211e2287ca52068841d85b22b0531a; 78d42fcf245a46d1c6e08e683bc637bc284b1724. - Automatic Landing Gear Deployment for Fixed-Wing: Automates deployment of landing gear during LAND and retraction after takeoff for armed/in-flight fixed-wing aircraft. Commit 5e34fe600ada43c09321cc2cd7dbbf477b92f92a. Major bugs fixed: - UBLOX GPS: Fixed the check for disabling CONFIG_RATE_SOL when PVT data is available; added NULL-pointer protection to VALSET handling; reduced overall configuration delay. Commits 69c540a0defcbc5547a3cd9dc2a81b989930e2e0; 500d190df3c73be30f40ead82a084e8f2a77fdcb; e2fc648cb013779680da4016e9995afb6bdcc22f. - Replay EKF2 Log Format: Fixed --force-ekf2 handling in Replay to ensure correct EKF2 log formats/units are written during replay. Commit 43bf73000ff913705327c0df8f628200beb8841c. Overall impact and accomplishments: - Expanded automation and configurability across flight control, GPS setup, and scripting environments, reducing manual intervention and configuration time while increasing safety and reliability. The new features enable flexible mission setups (SYSTEMID mapping, dynamic XY tuning, Lua-based DroneCAN messaging) and improved data replay/telemetry workflows, accelerating development and testing cycles. Technologies/skills demonstrated: - RC_Channel and attitude control integration patterns; UBLOX GPS flow improvements; DroneCAN and Lua scripting integration; automation of airframe systems (landing gear) in fixed-wing workflows; emphasis on robust error handling and safety (NULL-pointer protection, defensive checks).

January 2025

6 Commits • 3 Features

Jan 1, 2025

January 2025 monthly summary for ArduPilot/ardupilot focusing on foundational platform enhancements and CAN reliability improvements. Delivered broad hardware compatibility updates for the TBS-L431 peripheral, enhanced CAN termination management across AP_Periph and the bootloader, and clocking improvements enabling CAN on low-pin devices via LSE support on STM32L4xx. These efforts directly increase hardware supportability, reliability of CAN networks, and enable future CAN-enabled peripherals, delivering measurable business value through faster peripheral integration, safer CAN operation, and reduced maintenance overhead.

December 2024

23 Commits • 11 Features

Dec 1, 2024

Month: 2024-12. Delivered key features to reduce flash usage, improve build server capabilities, and enhance autopilot reliability. Highlights include enabling PID filtering on the custom build server, enabling four filters on low-flash boards, flash-optimization across multiple modules to save flash, and code quality improvements in AC_Fence, plus autotest enhancements. Notable stability fixes in AP_CANManager and bootloader, scripting bindings enhancements, and Plane autoland base leg waypoint addition. Overall impact: lower flash footprint, more maintainable codebase, faster builds, and improved flight safety testing.

November 2024

45 Commits • 18 Features

Nov 1, 2024

November 2024 performance summary for ArduPilot/ardupilot: Delivered broad modernization of memory management across the HAL stack and expanded scripting capabilities, enabling more robust automation and safer memory usage across all supported variants. Key features include AP_HAL heap rework, new scripting heap APIs across HAL variants, and the AP_MultiHeap library with unit tests, complemented by removal of legacy heap APIs to reduce technical debt and maintenance risk. Scripting and runtime reliability improved with a heap expansion warning, Lua GC heuristics via last_failed, and integrated MultiHeap usage. Observability and platform coverage expanded via CAN logging/playback tooling, default PID logging, and new servo/status visibility (DroneCAN simulation, Active mask). Platform enablement includes IMU activation across Periph/Waf/HW and new barometer in HolybroG4_GPS, plus non-compass takeoff autotests and FENCE_AUTOENABLE regression fixes to improve test stability. Overall, these changes deliver stronger business value through safer memory management, richer automation capabilities, improved observability, and broader hardware support.

October 2024

3 Commits • 2 Features

Oct 1, 2024

Month: 2024-10. Focused on delivering observability for scripting and improving build reliability in restricted environments. Key features delivered include a new FlexDebug Lua script for AP_Scripting that logs debug messages and telemetry from AM32 DroneCAN ESCs, with error handling for version mismatches and ESC parameter logging. CI/Packaging improvements for HAL_QURT to generate deb packages for ArduCopter/ArduPlane/Rover and to remove sudo usage in packaging scripts for restricted build environments. No explicit bugs fixed were recorded this month; contributions primarily enhance stability, deployment reliability, and maintainability. Impact includes improved runtime visibility and easier field updates through robust scripting, plus streamlined, reproducible packaging pipelines across HAL_QURT targets. Technologies demonstrated include Lua scripting, DroneCAN telemetry, ArduPilot architecture, CI/CD automation, Debian packaging, and scripting for restricted build environments.

Activity

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Quality Metrics

Correctness91.0%
Maintainability89.6%
Architecture88.0%
Performance84.4%
AI Usage20.4%

Skills & Technologies

Programming Languages

CC++GitLuaMarkdownPythonShellSubmoduleTextYAML

Technical Skills

API DesignAPI DevelopmentAT CommandsAerospaceAerospace EngineeringAerospace SoftwareArduPilot IntegrationAutomated TestingAutopilot DevelopmentAutotestBitmask OperationsBootloader DevelopmentBug FixingBuild AutomationBuild System

Repositories Contributed To

1 repo

Overview of all repositories you've contributed to across your timeline

ArduPilot/ardupilot

Oct 2024 Feb 2026
17 Months active

Languages Used

LuaShellCC++PythonYAMLTextMarkdown

Technical Skills

Build AutomationBuild SystemsCI/CDDrone ControlEmbedded SystemsScripting

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