Kindly Morrow
ESP32 SuperMini Dev Board - Ultra Compact WiFi Bluetooth
Pack a full ESP32-C3 into a board the size of a postage stamp. At 22.5mm x 18mm, the SuperMini fits inside wall plates, wearables, and enclosures that would reject any other dev board. Full WiFi and Bluetooth, zero compromises on GPIO access.
The ESP32-C3 is a single-core RISC-V chip running at 160MHz with 4MB flash and robust 2.4GHz radio support. It handles WiFi 4 (802.11 b/g/n) and Bluetooth 5.0 LE simultaneously without breaking a sweat. Program it over USB-C with Arduino IDE, ESP-IDF, or MicroPython using the same libraries you already know.
Things to build with this
- Fit one inside a standard US wall outlet box alongside a relay, using the ESP32-C3's simultaneous WiFi and BLE to act as both a Matter-compatible smart switch and a Bluetooth proximity sensor for room occupancy detection
- Build a BLE beacon tag using the Bluetooth 5.0 LE advertising packets to broadcast sensor readings (temperature, battery level) without pairing, readable by any nearby phone or hub without a connection handshake
- Deploy a mesh of these as ESP-NOW nodes across a building: at 22.5mm x 18mm each hides behind a picture frame or inside a door frame, relaying sensor packets peer-to-peer without a router using ESP32's native ESP-NOW protocol
Key Features
- ESP32-C3 RISC-V core at 160MHz with 4MB flash onboard
- WiFi 4 (802.11 b/g/n) and Bluetooth 5.0 LE, both active simultaneously
- Ultra-compact 22.5mm x 18mm footprint, smaller than a thumb drive
- USB-C for programming and power, no adapter needed
- All GPIO pins broken out on 2.54mm breadboard-compatible spacing
- Deep sleep current draw under 5µA for battery-powered deployments
- Compatible with Arduino IDE, ESP-IDF, and MicroPython out of the box
Frequently Asked Questions
Is this actually an ESP32-C3 and not the original ESP32?
Yes. The SuperMini uses the ESP32-C3, a single-core RISC-V chip. It is not the dual-core Xtensa ESP32. Most Arduino and ESP-IDF libraries are compatible, but double-check anything that relies on dual-core task pinning or ESP32-specific Bluetooth Classic (the C3 supports BLE only, not Classic Bluetooth).
How many GPIO pins are actually usable?
The ESP32-C3 has 22 GPIO pins total, and the SuperMini exposes the usable subset across two rows. GPIO 11-17 are tied to the internal flash and are not broken out. You get analog inputs, I2C, SPI, UART, and PWM on the available pins.
Can I power this from a LiPo battery directly?
The board runs on 3.3V regulated from the USB-C input. There is no onboard LiPo charger or JST connector. Power a LiPo through a separate charger/regulator board and feed 3.3V to the 3V3 pin, or 5V to the 5V pin if your regulator outputs 5V.
Does it need a separate USB-to-serial adapter?
No. The SuperMini has a USB-C port with onboard USB-serial circuitry. Plug it into your computer, select the correct COM port, and flash it directly from Arduino IDE or esptool.
Why we stock this
Curated by Kindly Morrow. We test and vet every product before it hits the store. If we wouldn't use it in our own builds, we don't sell it.
Things to build with this
Fun projects to try once you get your hands on it.
Movie mode with one tap
NFC tag on your coffee table. Tap your phone: lights dim, TV turns on, blinds close. Tap again to undo. Feels like magic every time.
Laundry notification system
Vibration sensor on your washing machine. When it stops vibrating, your phone buzzes. No more forgetting wet clothes for 3 days.
Automatic night light path
Motion sensors in the hallway trigger dim warm lights at floor level after 10pm. Walk to the bathroom without waking up fully.
Mailbox alert
Contact sensor on the mailbox door. Home Assistant sends a notification when mail arrives. Never walk to an empty mailbox again.
