Deep ESP32, Arduino, and industrial IoT tutorials for firmware developers.https://www.logicfrenzy.com/en-ushttps://www.logicfrenzy.com/blog/esp32-event-driven-firmware/https://www.logicfrenzy.com/blog/esp32-event-driven-firmware/Polling loops are the goto of firmware architecture — everyone uses them, everyone knows they're bad, nobody stops. Here's how to build a proper event-driven system on ESP32 with FreeRTOS queues, and why you'll eventually want something like AdvancedSignalSlot.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-freertos-tasks/https://www.logicfrenzy.com/blog/esp32-freertos-tasks/FreeRTOS is already running on your ESP32 whether you know it or not. Learn task creation, stack sizing, inter-task communication, mutexes, and how to not shoot yourself with shared state.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-gpio-explained/https://www.logicfrenzy.com/blog/esp32-gpio-explained/A production-focused deep dive into ESP32 GPIO: floating pins, the GPIO matrix, hardware and software debouncing, ISR rules, volatile variables, and current limits. Skip the toy examples.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-modbus-tutorial/https://www.logicfrenzy.com/blog/esp32-modbus-tutorial/Modbus is 45 years old and it's everywhere. Learn RTU over RS485 with proper direction control, function codes, 32-bit register reconstruction, error handling, and a complete energy meter example.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-mqtt-tutorial/https://www.logicfrenzy.com/blog/esp32-mqtt-tutorial/MQTT for production ESP32 firmware: broker options, QoS, LWT, retained messages, and a robust reconnect loop that survives both WiFi and broker drops. No toy snippets.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-ota-updates/https://www.logicfrenzy.com/blog/esp32-ota-updates/OTA is not optional for production firmware. Learn the ESP32 partition scheme, HTTP OTA with MD5 verification, rollback on failure, HTTPS certificate pinning, and versioning strategy.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-state-machine/https://www.logicfrenzy.com/blog/esp32-state-machine/Boolean flags and nested if/else statements are a maintenance trap. Here's how to replace them with a proper finite state machine using a transition table — and why impossible states become structurally excluded.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-watchdog-timer/https://www.logicfrenzy.com/blog/esp32-watchdog-timer/Hardware watchdog timers are your last line of defense against hung firmware. Learn how ESP32's Task Watchdog Timer works, the anti-patterns that make it useless, and how to build a health monitor task that actually catches real failures.Fri, 19 Jun 2026 00:00:00 GMThttps://www.logicfrenzy.com/blog/esp32-timers-stop-using-delay/https://www.logicfrenzy.com/blog/esp32-timers-stop-using-delay/delay() blocks everything. Learn how ESP32 hardware timers and millis()-based patterns let you multitask without FreeRTOS.Thu, 18 Jun 2026 00:00:00 GMT