ESP32-C3 SuperMini
Also known as: ESP32-C3 SuperMini · C3 Super Mini · ESP32-C3 0.42 OLED
Dirt-cheap, thumbnail-sized RISC-V board with USB-C and BLE 5, ideal for sensors, beacons and one-off projects. The 0.42" OLED variant was the top affiliate seller.
As an Amazon Associate and an affiliate we may earn from qualifying purchases. Prices and availability are set by the retailer.
At a glance
⚑ flag an error| SoC | ESP32-C3 |
|---|---|
| Vendor | Generic / multiple |
| Type | Tiny / minimal |
| Memory | 4 MB flash |
| Display | 0.42" 72x40 OLED (SSD1306 (OLED variant), I2C bus) |
| Connectivity | Wi-Fi, BLE 5 |
| USB | USB-C |
| Battery | No |
| Typical price | $2-4 (street, varies) |
Compare all ESP32 display boards in one table →
Good for
Works with
Firmware and UI-stack support, with a known-good starting point where one exists. "Community" means an unofficial but working config or port.
- ESPHome Community support
Gotchas to know
- The onboard ceramic antenna has well-documented weak Wi-Fi range/sensitivity on many clones.
- GPIO8/9 are strapping pins (affect boot).
- Single-core RISC-V; clone quality varies.
- OLED variant: 0.42" 72x40 over I2C (very small), addressed as a 128x64 panel with a ~(30,12) offset; many units use an SH1107-alike driver, so ESPHome's ssd1306 config renders at half brightness (use the sh1106 workaround).
Variants
Plain (no display) and 0.42" OLED versions; several near-identical clones and a 'Plus/v2' revision.
The ESP32-C3 inside
This board is built on the ESP32-C3 . See the SoC page for the full peripheral, GPIO and security details.
Bare modules on the same SoC:
Adding sensors?
Presence radars, climate, CO2, energy — the sensor comparison table covers what people actually wire to these boards, with ESPHome support status and clone-risk ratings per part. Radars want a hardware UART; I2C sensors chain on two pins.
Resources
Community guides usually go deeper than this page: pinout diagrams, wiring, library setup and copy-paste example code from people who build with these boards daily.