https://sv.sajeevanveeriah.workers.dev/blog/ Practical writing on robotics, embedded systems, AI and software. en-AU Wed, 23 Sep 2026 00:00:00 GMT https://sv.sajeevanveeriah.workers.dev/blog/test-a-robot-when-the-data-stops/ https://sv.sajeevanveeriah.workers.dev/blog/test-a-robot-when-the-data-stops/ Wed, 23 Sep 2026 00:00:00 GMT A practical ROS 2 fault-injection plan for stale observations, delayed commands and controlled recovery, with an illustrative stopping-distance calculation. https://sv.sajeevanveeriah.workers.dev/blog/gendio-control-board-and-radar-positioning/ https://sv.sajeevanveeriah.workers.dev/blog/gendio-control-board-and-radar-positioning/ Sun, 20 Sep 2026 00:00:00 GMT A detailed design study of the ESP32-S3 controller, its power and protocol boundaries, and a radar-based positioning extension that preserves the existing PCB. https://sv.sajeevanveeriah.workers.dev/blog/solar-panel-cleaning-robot-design-study/ https://sv.sajeevanveeriah.workers.dev/blog/solar-panel-cleaning-robot-design-study/ Sun, 20 Sep 2026 00:00:00 GMT CAD, traction and energy calculations, conservative coverage planning and an experimental roadmap for a modular dry-cleaning crawler. https://sv.sajeevanveeriah.workers.dev/blog/ros2-navigation-rover-case-study/ https://sv.sajeevanveeriah.workers.dev/blog/ros2-navigation-rover-case-study/ Fri, 18 Sep 2026 00:00:00 GMT How I organised sensing, estimation, planning and control for a differential-drive rover, and what simulation could establish. https://sv.sajeevanveeriah.workers.dev/blog/esp32-movement-assessment-case-study/ https://sv.sajeevanveeriah.workers.dev/blog/esp32-movement-assessment-case-study/ Fri, 18 Sep 2026 00:00:00 GMT Integrating Hall-effect sensing, embedded acquisition, Bluetooth and MATLAB into a movement-assessment prototype. https://sv.sajeevanveeriah.workers.dev/blog/swl-pricing-inventory-case-study/ https://sv.sajeevanveeriah.workers.dev/blog/swl-pricing-inventory-case-study/ Fri, 18 Sep 2026 00:00:00 GMT A local-first pricing workflow with deterministic matching, exact money handling and an operator-reviewed ServiceM8 export. https://sv.sajeevanveeriah.workers.dev/blog/gendio-display-controller-case-study/ https://sv.sajeevanveeriah.workers.dev/blog/gendio-display-controller-case-study/ Fri, 18 Sep 2026 00:00:00 GMT An ESP32-S3 display-controller design connecting serial parsing, guarded display output, a four-layer PCB and browser configuration. https://sv.sajeevanveeriah.workers.dev/blog/the-second-life-of-a-product/ https://sv.sajeevanveeriah.workers.dev/blog/the-second-life-of-a-product/ Thu, 17 Sep 2026 00:00:00 GMT What a product reveals about its design when someone needs to open it, find a part and put it back into service. https://sv.sajeevanveeriah.workers.dev/blog/in-praise-of-the-volume-knob/ https://sv.sajeevanveeriah.workers.dev/blog/in-praise-of-the-volume-knob/ Thu, 17 Sep 2026 00:00:00 GMT A small control raises a larger design question: how much attention should an everyday adjustment demand? https://sv.sajeevanveeriah.workers.dev/blog/sampling-can-hide-real-motion/ https://sv.sajeevanveeriah.workers.dev/blog/sampling-can-hide-real-motion/ Wed, 16 Sep 2026 00:00:00 GMT How an 80 Hz signal becomes indistinguishable from 20 Hz when sampled at 100 samples per second, and what to check before trusting a trend. https://sv.sajeevanveeriah.workers.dev/blog/inspection-accuracy-and-missed-defects/ https://sv.sajeevanveeriah.workers.dev/blog/inspection-accuracy-and-missed-defects/ Wed, 16 Sep 2026 00:00:00 GMT A worked inspection example showing why defect recall, false rejects and review workload belong beside the headline accuracy score. https://sv.sajeevanveeriah.workers.dev/blog/the-experience-trap/ https://sv.sajeevanveeriah.workers.dev/blog/the-experience-trap/ Sun, 13 Sep 2026 00:00:00 GMT Years in a role can tell us something. They cannot tell us everything. A case for assessing capability, supporting graduates and rewarding people who keep learning. https://sv.sajeevanveeriah.workers.dev/blog/machine-vision-starts-with-the-image/ https://sv.sajeevanveeriah.workers.dev/blog/machine-vision-starts-with-the-image/ Sun, 13 Sep 2026 00:00:00 GMT A worked example of field of view, exposure and motion blur, and how to tell whether an inspection image contains enough evidence. https://sv.sajeevanveeriah.workers.dev/blog/automation-queues-and-flow-time/ https://sv.sajeevanveeriah.workers.dev/blog/automation-queues-and-flow-time/ Sun, 13 Sep 2026 00:00:00 GMT What Little's Law and a simple queue model reveal about work in progress, waiting time and where automation can actually help. https://sv.sajeevanveeriah.workers.dev/blog/mqtt-connected-does-not-mean-current/ https://sv.sajeevanveeriah.workers.dev/blog/mqtt-connected-does-not-mean-current/ Sat, 12 Sep 2026 00:00:00 GMT Separating connection health, measurement age and validity in an MQTT dashboard, with a practical stale-data test. https://sv.sajeevanveeriah.workers.dev/blog/ros2-topic-visible-but-no-messages/ https://sv.sajeevanveeriah.workers.dev/blog/ros2-topic-visible-but-no-messages/ Sat, 12 Sep 2026 00:00:00 GMT A focused way to diagnose ROS 2 QoS mismatches, separate discovery from delivery, and test the actual subscriber. https://sv.sajeevanveeriah.workers.dev/blog/robot-localisation-before-controller-tuning/ https://sv.sajeevanveeriah.workers.dev/blog/robot-localisation-before-controller-tuning/ Fri, 11 Sep 2026 00:00:00 GMT A practical way to separate coordinate-frame, timing and localisation faults before changing a navigation controller. https://sv.sajeevanveeriah.workers.dev/blog/noisy-sensors-hysteresis-and-debounce/ https://sv.sajeevanveeriah.workers.dev/blog/noisy-sensors-hysteresis-and-debounce/ Fri, 11 Sep 2026 00:00:00 GMT How hysteresis, debounce and explicit states turn a fluctuating measurement into a useful event without hiding the timing cost. https://sv.sajeevanveeriah.workers.dev/blog/local-ai-beyond-the-model/ https://sv.sajeevanveeriah.workers.dev/blog/local-ai-beyond-the-model/ Fri, 11 Sep 2026 00:00:00 GMT A practical design for checking retrieval, source quality and permission boundaries in an assistant that runs on your own hardware. https://sv.sajeevanveeriah.workers.dev/blog/csv-imports-that-deserve-trust/ https://sv.sajeevanveeriah.workers.dev/blog/csv-imports-that-deserve-trust/ Fri, 11 Sep 2026 00:00:00 GMT Preserving identifiers, resolving ambiguity and making an import reviewable before it changes an operational system. https://sv.sajeevanveeriah.workers.dev/blog/local-first-apps-need-a-restore-path/ https://sv.sajeevanveeriah.workers.dev/blog/local-first-apps-need-a-restore-path/ Fri, 11 Sep 2026 00:00:00 GMT Why offline use, saved data, export and recovery need separate acceptance tests in a small personal or business app. https://sv.sajeevanveeriah.workers.dev/blog/automation-retries-without-duplicate-actions/ https://sv.sajeevanveeriah.workers.dev/blog/automation-retries-without-duplicate-actions/ Fri, 11 Sep 2026 00:00:00 GMT Designing retries, operation records and human review for the uncertain gap between sending a request and seeing its result. https://sv.sajeevanveeriah.workers.dev/blog/ai-without-the-jargon/ https://sv.sajeevanveeriah.workers.dev/blog/ai-without-the-jargon/ Thu, 10 Sep 2026 00:00:00 GMT A plain-English guide to trying AI, protecting your information and checking the answers.