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Cheat sheets, templates, and tools to keep at your side while building firmware. All free, forever.
Free eBooks
Taming the Loop
Stop blocking. Write firmware that handles sensors, MQTT, and UI simultaneously — without FreeRTOS overhead.
Coming soonCheat Sheets
ESP32 GPIO Reference
Every pin, its capabilities, what to avoid, and pull-up/pull-down rules at a glance.
Coming soonMQTT Quick Reference
QoS levels, LWT setup, topic naming conventions, and PubSubClient snippets.
Coming soonFreeRTOS Task Template
Ready-to-copy dual-core task scaffold with queue, mutex, and watchdog wired in.
Coming soonModbus Register Map Template
Spreadsheet template for documenting Modbus device register maps with address, type, scale, and notes.
Coming soonRecommended Tools
PlatformIO
IDEThe professional IDE for embedded. Handles libraries, toolchains, and serial monitor better than Arduino IDE.
MQTT Explorer
DebuggingVisual MQTT client — see all topics live, publish test messages, debug broker connections instantly.
ESP-IDF
FrameworkEspressif's official framework. More control than Arduino, required for production ESP32 builds.
Wokwi
SimulatorBrowser-based ESP32 simulator. Test firmware without hardware — great for circuit and code prototyping.
Wireshark
DebuggingCapture and inspect Modbus TCP, MQTT, and any industrial protocol traffic on your network.
draw.io
DesignFree diagram tool — perfect for drawing state machines, FSM diagrams, and system architecture before coding.
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