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esp32_devkitc_wroom.overlay
/* Zephyr devicetree overlay — ESP32 */
&i2c0 {
    status = "okay";

    sht31: sht3xd@44 {
        compatible = "sensirion,sht3xd";
        reg = <0x44>;   /* 7-bit I2C address */
    };
};
12Zephyr Lessons
∞Curiosity
New hardware

Meet the EFZ-ESP32S3

The board this course runs on — a bare ESP32-S3 with every peripheral a lesson touches already on it: an SHT30 sensor, a 6-axis IMU, an RGB LED, a microphone, a speaker amp, a microSD slot, a display, and your own headers. Powered, flashed and debugged over a single USB-C cable, with upstream-style Zephyr board support. Every example on this site is verified on it.

Read the announcement →See the specsDownload the schematic
EFZ-ESP32S3 board, front and back

Topics

Pick your area. Beginners start with Zephyr RTOS. Experienced engineers jump straight to the topic.

⚡Active
Zephyr RTOS

Devicetree, Kconfig, drivers, BLE, power management — from first west build to production firmware.

🔌Coming Soon
Protocols

I2C, SPI, UART, CAN, MQTT — how they actually behave on real silicon, not just the datasheet.

🏭Coming Soon
Industrial IoT

Modbus, edge gateways, fieldbus protocols, rugged firmware patterns for industrial environments.

🤖Coming Soon
AIoT & Edge AI

TensorFlow Lite Micro, Edge Impulse, running inference on constrained MCUs.

📋Active
Reference

West commands, pin tables, I2C address lookup, Kconfig flags — the cheat sheets you actually need.

Latest from the Bench

Build diaries — honest accounts of what worked, what burned, and what the next board spin will fix.

Build diaries, lessons learned, and notes from the field — coming soon.

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