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esp32c3-oled042

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Firmware development for the ESP32-C3 0.42" OLED board (ESP32-C3FH4, QFN32) — the ABRobot / 01Space "ESP32-C3-0.42LCD" mini board and its clones, sold as "ESP32-C3 SuperMini with OLED" and "ESP32 C3 OLED development board". Covers its 72x40 SSD1306 OLED on I2C, the single I2C bus, blue LED on GPIO8, BOOT button on GPIO9, USB Serial/JTAG console, ADC1, Wi-Fi/BLE, and the ESP-IDF + PlatformIO setup around them. Use when working on this board or a bare ESP32-C3: project setup, platformio.ini and sdkconfig, pin mapping and strapping pins, getting the 0.42-inch display to show something other than snow, U8g2 offsets, adding a second I2C device, flashing over USB-C, or debugging why something on the board does not work.

skills/esp32/esp32c3-oled042/SKILL.md

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Source commit 816967f30a7dbdf4759ad585b822eda3575f720c

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
No
Observed behavior
Network or broad shell
Last checked
Nov 11, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

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Repository stars (not skill ratings)
27
Repository last updated
Oct 30, 2026
License
MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

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# ESP32-C3 0.42" OLED (ESP32-C3FH4)

A 25 × 20 mm ESP32-C3 board with a 0.42-inch OLED glued to it. Two things make
it worth a skill: **the panel is a 72 × 40 window inside a 128 × 64 controller
and does not start at column 0**, and **the C3 has exactly one I2C controller,
which the panel occupies**. Almost every failure on this board traces back to
one of those two facts, and neither is visible from the code.

There is no vendor datasheet for the board. The detail below is assembled from
the schematic, the Zephyr port, published bring-ups and a working project —
read the reference files rather than guessing.

- `reference/board-hardware.md` — the board reference: pin table, reset-time
  states, strapping analysis, free pins, peripheral availability, power tree,
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