ESP32-C6 SuperMini

Partly tested

Runs on the mesh and takes updates over the air; drives an electric candle (LED + coil) and reads a battery through a divider. Bluetooth floods, deep sleep and LED strips are built but not yet tried on this board. Plugged into a computer with no serial monitor open it hung every few minutes until 2026-10-16 (fixed).

Chip	ESP32-C6FH4
Dimmers, servos & motors	6 PWM channels (a motor takes 2)
LED strips (WS2812)	up to 2
Battery	no built-in sense; power it from USB or a 5 V supply, or add a two-resistor divider to read a battery (Battery props)
Firmware	esp32-c6-supermini, install it from your browser

Pinout

Note

Different sellers lay this board’s pins out in a different order, so there is no drawing here. Go by the GPIO numbers printed on the board and the table below.

The seller-style pinout with photos: mischianti.org.

Versions of this board

“ESP32-C6 SuperMini” is a board format, not one product, and sellers’ versions differ. Check these on the board in hand:

• Header order differs between sellers. Go by the GPIO numbers printed on the board.
• Most have a WS2812 pixel on GPIO 8 and a blue status LED on GPIO 15. One seller’s version is reported to put the pixel elsewhere; if GPIO 8 does nothing, that may be why.
• Some versions have battery pads (B+ / B− or BAT) with a small charger behind them (a TP4054 set to 100 mA, so a 2000 mAh cell takes most of a day from empty; the green LED is on while charging and off when full) and others have none. There is no battery-sense pin, so the console shows the battery voltage only if you add a resistor divider to an ADC pin.
• The RGB pixel and the power LED draw about a milliamp even when the pixel is off, which is most of this board’s deep-sleep current. People who need months on a battery remove them.

Which pin for what

The console marks these with ★ when you assign pins. They are advice. Any pin that can do a job is allowed.

To connect…	Use	Why
Servo	7 14	Quiet at power-up, so nothing twitches while the board boots.
DC motor (H-bridge IN1/IN2)	18 19	A quiet pair side by side for IN1 / IN2 — a motor never lurches at boot.
Relay / on-off output	17 22 23	Quiet at power-up, so a relay never clicks on during boot.
LED strip (WS2812)	8 20 21	Any output can drive a strip; the C6 has two strip engines (RMT), so two strips at most. 3.3 V board — use a 74AHCT-type level shifter for 5 V strips.
LED dimmer (PWM)	15 16	The boot-quirk pins — a flicker at power-up doesn’t matter for a light. 15 is the blue status LED on most SuperMinis.
Sensor / button input	0 1 2 3 4 5 6 9	GPIO 0–7 are the low-power pins: the only ones that can wake the board from deep sleep on battery. All have internal pull-ups, so buttons need no resistor. 0–6 also read analog.

Every pin

Pin	GPIO		Can be	Note
0	0	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep
1	1	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep
2	2	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep
3	3	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep
4	4	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep	strapping pin (SDIO timing) — sampled at power-up but harmless for anything this board does
5	5	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep	strapping pin (SDIO timing) — sampled at power-up but harmless for anything this board does
6	6	✅ good	input, output, pull-up, pull-down, analog, wakes from sleep
7	7	✅ good	input, output, pull-up, pull-down, wakes from sleep
8	8	⚠️ caution	output	STRAPPING + the onboard RGB pixel’s data line (WS2812). LED_STRIP with 1 pixel lights it; nothing else belongs here
9	9	⚠️ caution	input, pull-up, pull-down	STRAPPING + the BOOT button: low at reset = download mode. A button here is fine (don’t hold it while resetting); inputs only
15	15	⚠️ caution	output	STRAPPING + the blue status LED on most boards: outputs only, and nothing that pulls it low at reset
16	16	⚠️ caution	input, output, pull-up, pull-down	UART0 TX: the boot ROM prints here at power-up — fine for a light or strip, not for a relay or motor. The console uses USB, not this pin
17	17	✅ good	input, output, pull-up, pull-down	UART0 RX — unused here (the console runs on USB)
14	14	✅ good	input, output, pull-up, pull-down
18	18	✅ good	input, output, pull-up, pull-down
19	19	✅ good	input, output, pull-up, pull-down
20	20	✅ good	input, output, pull-up, pull-down
21	21	✅ good	input, output, pull-up, pull-down
22	22	✅ good	input, output, pull-up, pull-down
23	23	✅ good	input, output, pull-up, pull-down
12	12	⛔ reserved		USB D− — the console and the flasher live on the USB port
13	13	⛔ reserved		USB D+ — the console and the flasher live on the USB port