ESP32-C6 SuperMini Pinout + Safe GPIOs

The ESP32-C6 SuperMini is one of the smallest ways to get Wi-Fi 6, Bluetooth LE, Zigbee and Thread in an ESP32 project. On the common SuperMini layout, the easiest GPIOs to start with are GPIO0, GPIO1, GPIO2, GPIO3, GPIO14, GPIO20, GPIO21, GPIO22 and GPIO23. GPIO16/17 are also useful when UART0 is not needed. GPIO4, GPIO5, GPIO8, GPIO9 and GPIO15 are ESP32-C6 strapping pins, GPIO8 is normally connected to the onboard RGB LED, GPIO9 is connected to BOOT, GPIO15 commonly drives the onboard status LED, and GPIO12/13 are used by native USB. Because “SuperMini” is a third-party board format rather than an official Espressif board, small hardware differences exist between suppliers, so always compare the markings on the actual board before soldering a final design. Espressif officially identifies GPIO4, GPIO5, GPIO8, GPIO9 and GPIO15 as ESP32-C6 strapping pins. (documentation.espressif.com)

Materials You’ll Need

For a basic ESP32-C6 SuperMini project, the most useful parts are:

Item	Why you need it
ESP32-C6 SuperMini development board	Main microcontroller board
USB-C data cable	Programming and power
2.54 mm header pins	For breadboard or jumper-wire use
Breadboard	Easy prototyping
Dupont jumper wires	Connecting sensors and modules
3.3 V-compatible sensor or module	For testing GPIO/I²C/SPI
Multimeter	Useful for checking power and wiring
Optional level shifter	Required for some 5 V logic devices

The ESP32-C6 itself uses 3.3 V GPIO logic. Do not feed 5 V directly into a GPIO.

For a first practical test, an inexpensive I²C sensor such as an SHT40, BME280 or OLED display is ideal because only four connections are required.

What is the ESP32-C6 SuperMini?

The ESP32-C6 SuperMini is a compact third-party development board built around Espressif’s ESP32-C6.

Typical boards provide:

32-bit RISC-V CPU
up to 160 MHz main processor
20 MHz low-power RISC-V processor
512 KB high-performance SRAM
Wi-Fi 6 at 2.4 GHz
Bluetooth Low Energy
IEEE 802.15.4
Zigbee
Thread
USB-C
native USB Serial/JTAG
ADC
I²C
SPI
UART
PWM
onboard LEDs
BOOT and RESET buttons

The common board is only around 22–25 mm long and roughly 18–20 mm wide, depending on manufacturer.

That makes it particularly attractive for:

Home Assistant sensors
Zigbee devices
Thread devices
Matter experiments
small ESPHome nodes
embedded controllers
battery projects
3D-printed enclosures

The ESP32-C6 itself combines Wi-Fi 6, Bluetooth LE and an IEEE 802.15.4 radio on the same chip.

Important: SuperMini is not one official board

There is no single official Espressif ESP32-C6 SuperMini specification.

“SuperMini” describes a compact third-party board format manufactured by several vendors.

Most current boards use essentially the same layout, but differences can include:

regulator
USB circuitry
flash configuration
charging circuitry
LEDs
antenna
exact PCB size
silkscreen
exposed pads

This is why some internet pinout diagrams disagree.

The GPIO functions in this article are based on the common 2025/2026 C6 SuperMini layout, combined with Espressif’s official ESP32-C6 GPIO restrictions.

For a permanent PCB design, verify the exact SuperMini board being purchased before designing around it.

Quick safe GPIO cheat sheet

For most projects, start here:

Best general-purpose GPIOs

GPIO0
GPIO1
GPIO2
GPIO3
GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

These are the easiest pins for:

buttons
relays
LEDs
digital sensors
interrupts
PWM
I²C
SPI

Also useful

GPIO16
GPIO17

These are UART0 TX/RX by default, so they are excellent for serial peripherals but may interfere with UART logging if reused.

Use with care

GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO15

GPIO4, 5, 8, 9 and 15 have boot/strapping roles.

GPIO6 and GPIO7 are associated with JTAG functions.

Avoid for normal projects when using USB

GPIO12
GPIO13

These are the native USB data pins.

Common ESP32-C6 SuperMini pinout

A typical C6 SuperMini exposes approximately the following pins.

Board marking	ESP32-C6 GPIO	Main notes
5V	—	USB/external 5 V rail
GND	—	Ground
3V3	—	Regulated 3.3 V
TX	GPIO16	UART0 TX
RX	GPIO17	UART0 RX
0	GPIO0	ADC, safe general GPIO
1	GPIO1	ADC, safe general GPIO
2	GPIO2	ADC, safe general GPIO
3	GPIO3	ADC, safe general GPIO
4	GPIO4	ADC, strapping, JTAG
5	GPIO5	ADC, strapping, JTAG
6	GPIO6	ADC, JTAG
7	GPIO7	JTAG
8	GPIO8	Strapping + onboard RGB LED
9	GPIO9	Strapping + BOOT
12	GPIO12	USB D−
13	GPIO13	USB D+
14	GPIO14	Good general GPIO
15	GPIO15	Strapping + status LED on many boards
18	GPIO18	General/peripheral functions; verify board revision
19	GPIO19	General/peripheral functions; verify board revision
20	GPIO20	Good general GPIO
21	GPIO21	Good general GPIO
22	GPIO22	Good general GPIO
23	GPIO23	Good general GPIO

Common SuperMini boards additionally connect an RGB LED to GPIO8 and BOOT to GPIO9. The exact board-level mapping should still be checked because SuperMini hardware is produced by multiple vendors. (mischianti.org)

The genuinely important boot pins

The official ESP32-C6 strapping GPIOs are:

GPIO4
GPIO5
GPIO8
GPIO9
GPIO15

Espressif samples these pins during reset to configure low-level chip behaviour. (Espressif Systems)

That does not mean these GPIOs can never be used.

It means external circuitry must not force them to an inappropriate state while the ESP32-C6 is starting.

Typical problematic circuits include:

strong pull-up resistors
strong pull-down resistors
relay modules
external microcontrollers
sensors that actively drive the line during reset

After startup, these pins can normally be used as GPIOs.

GPIO9: the BOOT pin

GPIO9 deserves special attention because the SuperMini normally connects it to the BOOT button.

Holding GPIO9 LOW during reset causes the ESP32-C6 to enter firmware download mode.

Conceptually:

GPIO9 normal
→ run firmware

GPIO9 LOW during reset
→ download/programming mode

If a peripheral permanently pulls GPIO9 LOW, the board may appear to stop booting.

Symptoms include:

sketch never starts
serial bootloader waits for upload
board only works when the peripheral is removed

For ordinary sensors and outputs, use another GPIO.

GPIO8: onboard RGB LED

On most C6 SuperMini boards, GPIO8 drives a small WS2812-compatible addressable RGB LED.

GPIO8 is also a strapping pin.

That makes it useful for status indication but a poor first choice for an unrelated external circuit.

The onboard RGB LED can normally be controlled with libraries such as:

Adafruit NeoPixel
FastLED

A simple Arduino example is:

#include <Adafruit_NeoPixel.h>

#define RGB_PIN 8

Adafruit_NeoPixel pixel(
  1,
  RGB_PIN,
  NEO_GRB + NEO_KHZ800
);

void setup() {
  pixel.begin();

  pixel.setPixelColor(
    0,
    pixel.Color(0, 50, 0)
  );

  pixel.show();
}

void loop() {
}

If the RGB LED behaves strangely during boot, remember that GPIO8 also participates in ESP32-C6 startup configuration.

GPIO15: status LED and strapping

Many SuperMini versions also connect a conventional onboard status LED to:

GPIO15

GPIO15 is also a strapping pin.

It can be used after startup, but external circuitry should not interfere with its reset state.

If an ordinary output pin is required, GPIO14, 20, 21, 22 or 23 is cleaner.

GPIO4 and GPIO5

GPIO4 and GPIO5 are both:

ADC capable
general-purpose GPIO capable
low-power-domain capable

but they are also ESP32-C6 strapping pins.

They additionally carry JTAG functions:

GPIO4 → MTMS
GPIO5 → MTDI

They can still be useful once the boot requirements are understood.

For beginners, however:

GPIO0–3
GPIO14
GPIO20–23

are simpler.

GPIO6 and GPIO7

GPIO6 and GPIO7 are not ESP32-C6 strapping pins, despite some SuperMini pinout diagrams incorrectly grouping them with boot pins.

Their important special role is JTAG:

GPIO6 → MTCK
GPIO7 → MTDO

Espressif distinguishes these from the actual strapping pins GPIO4, GPIO5, GPIO8, GPIO9 and GPIO15. (documentation.espressif.com)

If JTAG debugging is not being used, GPIO6 and GPIO7 can often be reused.

For a first project, though, the totally uncomplicated GPIOs remain preferable.

GPIO12 and GPIO13: native USB

These two pins deserve another clear warning:

GPIO12 → USB D−
GPIO13 → USB D+

They form the ESP32-C6’s built-in USB Serial/JTAG connection. (Espressif Systems)

This is how tiny boards such as the SuperMini can provide USB-C programming without needing a separate CP2102 or CH340 serial converter.

GPIO12 and GPIO13 can technically be reassigned as normal GPIOs.

But doing so disables native USB functionality.

That can affect:

USB serial monitor
USB programming
JTAG
firmware recovery

For normal projects:

leave GPIO12 and GPIO13 alone.

There are enough other pins available.

GPIO16 and GPIO17: UART0

The pads commonly marked:

TX
RX

map to:

TX → GPIO16
RX → GPIO17

This matches the default ESP32-C6 UART0 assignment.

They are useful for devices such as:

GPS modules
LD2410
LD2420
PMS5003
RS-485 adapters
serial displays

Example:

HardwareSerial SensorSerial(0);

void setup() {
  SensorSerial.begin(
    115200,
    SERIAL_8N1,
    17,
    16
  );
}

void loop() {
}

Remember:

Peripheral TX → ESP32 RX
Peripheral RX → ESP32 TX

ADC pins

The ESP32-C6 provides seven ADC1 channels:

GPIO	ADC channel
GPIO0	ADC1_CH0
GPIO1	ADC1_CH1
GPIO2	ADC1_CH2
GPIO3	ADC1_CH3
GPIO4	ADC1_CH4
GPIO5	ADC1_CH5
GPIO6	ADC1_CH6

This is a welcome improvement over the original ESP32’s awkward ADC1/ADC2 Wi-Fi conflict.

For a simple analog input, the cleanest choices are:

GPIO0
GPIO1
GPIO2
GPIO3

because GPIO4 and GPIO5 are strapping pins and GPIO6 also has a JTAG role.

Typical uses include:

potentiometers
analog light sensors
voltage dividers
analog pressure sensors
battery monitoring

Never exceed the permitted ESP32 ADC input voltage.

Best analog GPIOs

For an analog sensor:

first choice: GPIO0–GPIO3

Example:

const int sensorPin = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  int reading = analogRead(sensorPin);

  Serial.println(reading);

  delay(500);
}

GPIO0–GPIO3 are particularly convenient because they avoid the major USB, onboard LED and boot conflicts.

I²C pins

Unlike an old Arduino Uno, the ESP32-C6 does not force I²C onto one fixed pair of external GPIOs.

The GPIO matrix allows I²C signals to be routed to suitable pins.

A clean SuperMini choice is:

SDA → GPIO22
SCL → GPIO23

For example:

#include <Wire.h>

void setup() {
  Wire.begin(22, 23);
}

void loop() {
}

This is a good combination for:

SHT40
SHT45
BME280
BME688
INA219
INA226
SCD41
OLED displays
ADS1115

GPIO22/23 have none of the major boot, LED or USB complications.

ESPHome I²C example

For ESPHome:

i2c:
  sda: GPIO22
  scl: GPIO23
  scan: true

Then a sensor can be added normally.

For example:

sensor:
  - platform: sht4x
    temperature:
      name: "Room Temperature"

    humidity:
      name: "Room Humidity"

That creates an extremely compact:

ESP32-C6 SuperMini
+
SHT40/SHT45

Home Assistant environmental sensor.

SPI pins

SPI is also flexible because of the ESP32-C6 GPIO matrix.

A practical set of uncomplicated pins could be:

SCK  → GPIO23
MOSI → GPIO22
MISO → GPIO21
CS   → GPIO14

The exact mapping can be selected in software.

This is useful for:

TFT displays
external ADCs
radio modules
SD cards
SPI sensors

Avoid blindly copying the default SPI pins from an ESP32 DevKit or ESP32-C3 tutorial.

The C6 is a different chip and the SuperMini is a different board.

Best GPIO for a relay

A relay input should ideally avoid boot pins.

Good choices include:

GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

For example:

#define RELAY_PIN 14

void setup() {
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
}

void loop() {
}

A relay coil itself must not be powered directly from the ESP32 GPIO.

Use:

a proper relay module
transistor driver
MOSFET driver

depending on the hardware.

Best GPIO for a pushbutton

Good button pins include:

GPIO0
GPIO1
GPIO2
GPIO3
GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

Example:

#define BUTTON_PIN 20

void setup() {
  pinMode(
    BUTTON_PIN,
    INPUT_PULLUP
  );
}

void loop() {
  if (!digitalRead(BUTTON_PIN)) {
    // button pressed
  }
}

Avoid GPIO9 unless the button is deliberately intended to behave like the board’s BOOT button.

Best GPIO for a DS18B20

OneWire works well on a general-purpose GPIO.

A good choice is:

GPIO14

Typical wiring:

3.3V
 │
4.7kΩ
 │
 ├──── GPIO14
 │
DS18B20 DATA

That keeps the OneWire sensor away from USB and boot pins.

Best GPIO for a mmWave sensor

For a UART radar such as:

LD2410
LD2420
RD-03D

the obvious pair is:

GPIO16 → TX
GPIO17 → RX

Example:

Radar TX → GPIO17
Radar RX → GPIO16

This uses the ESP32-C6’s normal UART0 pins.

If USB serial debugging is preferred, another UART can be routed through different GPIOs.

Best pins for PWM

Most normal output-capable ESP32-C6 GPIOs can be used for PWM through the LEDC peripheral.

Clean choices include:

GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

Useful applications include:

LED dimming
MOSFET control
fan control
buzzers
motor drivers

For a 4-wire PC fan, for example, GPIO14 would be an excellent PWM-control GPIO.

GPIO recommendations table

GPIO	Recommendation	Main reason
GPIO0	✅ Excellent	ADC + general GPIO
GPIO1	✅ Excellent	ADC + general GPIO
GPIO2	✅ Excellent	ADC + general GPIO
GPIO3	✅ Excellent	ADC + general GPIO
GPIO4	⚠️ Care	Strapping + JTAG
GPIO5	⚠️ Care	Strapping + JTAG
GPIO6	🟡 Good with care	ADC + JTAG
GPIO7	🟡 Good with care	JTAG
GPIO8	⚠️ Avoid first	RGB LED + strapping
GPIO9	⚠️ Avoid	BOOT + strapping
GPIO12	❌ Avoid	USB D−
GPIO13	❌ Avoid	USB D+
GPIO14	✅ Excellent	Clean general I/O
GPIO15	⚠️ Care	Strapping + status LED
GPIO16	🟡 Good	UART0 TX
GPIO17	🟡 Good	UART0 RX
GPIO18	🟡 Verify board	Board-dependent use
GPIO19	🟡 Verify board	Board-dependent use
GPIO20	✅ Excellent	Clean general I/O
GPIO21	✅ Excellent	Clean general I/O
GPIO22	✅ Excellent	Clean general I/O
GPIO23	✅ Excellent	Clean general I/O

Why GPIO18 and GPIO19 deserve a note

This is one of the areas where SuperMini information online becomes inconsistent.

ESP32-C6 supports several alternative SPI/SDIO functions on GPIO18 and GPIO19, and different bare-chip/flash configurations can use resources differently.

Because SuperMini boards are third-party designs, do not assume every revision is electrically identical.

For a hobby prototype, GPIO18/19 may work perfectly on a particular board.

For a design that will be manufactured repeatedly:

use GPIO0–3, GPIO14 or GPIO20–23 first, and verify the exact SuperMini schematic before relying on GPIO18/19.

That avoids a large amount of unnecessary uncertainty.

The best GPIOs to remember

If there is only one section worth bookmarking, it is this:

Start here

GPIO0
GPIO1
GPIO2
GPIO3
GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

UART

GPIO16 TX
GPIO17 RX

ADC

GPIO0–GPIO6

Prefer:

GPIO0–GPIO3

for uncomplicated analog projects.

Boot/strapping pins

GPIO4
GPIO5
GPIO8
GPIO9
GPIO15

Native USB

GPIO12 D-
GPIO13 D+

Onboard hardware

GPIO8  → RGB LED
GPIO9  → BOOT
GPIO15 → status LED on many boards

Arduino IDE setup

Current Arduino-ESP32 versions support the ESP32-C6.

A common configuration is:

Board:
ESP32C6 Dev Module

Then enable:

USB CDC On Boot
→ Enabled

if native USB serial output is required.

Typical settings for a common 4 MB SuperMini are:

Board:
ESP32C6 Dev Module

Flash Size:
4MB

USB CDC On Boot:
Enabled

Do not assume every SuperMini has the same flash capacity.

Check the listing or actual chip/board before selecting a larger flash size.

Basic Blink test

Because GPIO8 is normally connected to an addressable RGB LED rather than a simple conventional LED, it is often easier to test a free GPIO with an external LED.

For example, connect:

GPIO14
→ 220–470Ω resistor
→ LED
→ GND

Then use:

#define LED_PIN 14

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(500);

  digitalWrite(LED_PIN, LOW);
  delay(500);
}

This also proves that:

firmware uploads correctly
the board boots normally
GPIO14 works
the Arduino toolchain is configured correctly

ESPHome setup

A basic ESPHome configuration can use:

esphome:
  name: c6-supermini
  friendly_name: C6 SuperMini

esp32:
  variant: esp32c6
  framework:
    type: esp-idf

logger:

api:

ota:

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

The exact board: definition supported by the installed ESPHome/PlatformIO version may vary.

Using the correct ESP32-C6 target is more important than assuming a third-party “SuperMini” board definition exists.

Zigbee, Thread and Matter

The main reason to choose a C6 SuperMini instead of a C3 SuperMini is not CPU performance.

Both C3 and C6 have 160 MHz RISC-V main processors.

The C6 adds an:

IEEE 802.15.4 radio

which enables:

Zigbee
Thread
Matter over Thread

in addition to:

Wi-Fi 6
Bluetooth LE

This makes the board unusually capable for its size.

A single tiny PCB can potentially form the basis of:

Zigbee temperature sensor
Thread environmental sensor
Matter smart switch
BLE device
Wi-Fi ESPHome node

depending on firmware.

C6 SuperMini vs C6 DevKitC

The SuperMini is ideal when:

size matters
the final project goes inside an enclosure
only a modest number of GPIOs are required
low cost matters

The official ESP32-C6-DevKitC-1 is better when:

maximum GPIO access matters
breadboard development matters
official schematics matter
predictable hardware revisions matter
debugging matters

The SuperMini is therefore excellent for finished hobby projects, while the DevKitC is often easier during development.

C6 SuperMini vs C3 SuperMini

Choose C3 SuperMini when:

Wi-Fi 4 is enough
BLE is enough
lowest cost matters
Zigbee/Thread are unnecessary

Choose C6 SuperMini when:

Wi-Fi 6 is useful
Zigbee is required
Thread is required
Matter experimentation is planned
more future flexibility is wanted

For a new smart-home sensor, the C6 is usually the more interesting option.

Common problem: board enters download mode every boot

Check GPIO9 first.

Something may be holding:

GPIO9 LOW

during reset.

Disconnect external hardware from GPIO9 and reset again.

Also inspect:

GPIO4
GPIO5
GPIO8
GPIO15

because they are the other ESP32-C6 strapping pins.

Common problem: USB disappears after changing GPIOs

Check whether firmware reassigned:

GPIO12
GPIO13

These are:

USB D-
USB D+

Using them as ordinary GPIO disables native USB Serial/JTAG.

This can make the board appear “dead” even though the firmware itself is still running.

Hold BOOT during reset or reconnect using the appropriate flashing procedure if USB recovery is required.

Common problem: RGB LED won’t behave like a normal LED

The LED on GPIO8 is normally addressable, not simply wired between GPIO and ground.

So this:

digitalWrite(8, HIGH);

is not equivalent to controlling a normal single-colour LED.

Use a WS2812/NeoPixel-compatible library.

Also remember that GPIO8 is a strapping pin.

Common problem: ESP32-C6 won’t upload

Try:

Hold BOOT.
Press and release RESET.
Release BOOT.
Start the upload.

If necessary, hold BOOT while connecting USB.

Then confirm:

ESP32C6 Dev Module

or the correct C6 board definition is selected.

Also use a genuine USB data cable. Many USB-C cables supplied with chargers contain power conductors but no data connection.

Common problem: board works from USB but not 5 V pin

SuperMini power circuits vary more than official Espressif boards.

Do not assume that:

USB 5V
external 5V
battery

can all be connected simultaneously.

Check the exact PCB before combining power sources.

For a basic project, powering through USB-C is the safest development option.

Common problem: Wi-Fi works but Zigbee examples don’t

The presence of an IEEE 802.15.4 radio does not mean every Arduino or ESPHome build automatically becomes a Zigbee device.

Software support must also provide:

appropriate radio stack
Zigbee/Thread libraries
correct framework configuration
suitable partitioning
correct application firmware

The hardware capability is present, but the firmware still has to use it.

Recommended GPIO recipes

SHT40 / BME280 / OLED

SDA → GPIO22
SCL → GPIO23

Relay

GPIO14

Button

GPIO20

Analog sensor

GPIO0

UART sensor

TX → GPIO16
RX → GPIO17

PWM output

GPIO14

Extra digital sensors

GPIO20
GPIO21
GPIO22
GPIO23

This leaves all the awkward boot and USB pins untouched.

Suggested beginner pin allocation

For a typical Home Assistant node:

Function	GPIO
I²C SDA	GPIO22
I²C SCL	GPIO23
Relay	GPIO14
Button	GPIO20
Extra digital input	GPIO21
Analog input	GPIO0
UART RX	GPIO17
UART TX	GPIO16

This is a very clean starting configuration.

ESP32-C6 Datasheets & Documentation

For readers who want to go deeper, a dedicated ESP32-C6 Datasheets & Resources page on esp32.co.uk should collect the important reference material in one place.

That internal resource page can contain:

ESP32-C6 datasheet
ESP32-C6 technical reference manual
ESP32-C6 GPIO restrictions
ESP32-C6 strapping-pin table
ESP32-C6 ADC documentation
ESP32-C6 Wi-Fi/BLE information
ESP32-C6 Zigbee/Thread documentation
common SuperMini schematic
downloadable esp32.co.uk SuperMini pinout diagram

This allows other articles to link to one internal documentation hub instead of repeatedly sending readers away to external sites.

For manufacturer verification, the key external references are the official ESP32-C6 Datasheet and ESP-IDF GPIO documentation. (documentation.espressif.com)

Related ESP32 Guides

Readers using the ESP32-C6 SuperMini should also see these related guides on esp32.co.uk:

ESP32-C3 vs ESP32-C6: Which One Should You Use?
ESP32-C5 vs ESP32-C6: Which Should You Buy?
ESP32-C6 DevKitC vs DevKitM: Which C6 Board Should You Buy?
ESP32-C6 DevKitM-1 Pinout + Safe GPIOs
Full Comparison of All ESP32-C Versions and Development Boards
Best ESP32 for Home Assistant
Best ESP32 for Matter, Thread & Zigbee

These should be linked internally rather than sending readers to third-party comparison sites.

Final recommendation

The ESP32-C6 SuperMini is an unusually powerful board for its size.

For most projects, there is no reason to fight with every available GPIO.

Start with:

GPIO0
GPIO1
GPIO2
GPIO3
GPIO14
GPIO20
GPIO21
GPIO22
GPIO23

Use:

GPIO16 / GPIO17

when UART is required.

Keep away from:

GPIO12 / GPIO13

if native USB is needed.

And treat:

GPIO4
GPIO5
GPIO8
GPIO9
GPIO15

as boot-sensitive pins.

The most important practical difference between this board and an official Espressif DevKit is not the ESP32-C6 itself — it is the third-party SuperMini PCB surrounding it.

Once the particular board revision has been verified, however, the C6 SuperMini makes an excellent compact platform for:

Wi-Fi 6 + BLE + Zigbee + Thread + Matter projects.

Materials You’ll Need

What is the ESP32-C6 SuperMini?

Important: SuperMini is not one official board

Quick safe GPIO cheat sheet

Best general-purpose GPIOs

Also useful

Use with care

Avoid for normal projects when using USB

Common ESP32-C6 SuperMini pinout

The genuinely important boot pins

GPIO9: the BOOT pin

GPIO8: onboard RGB LED

GPIO15: status LED and strapping

GPIO4 and GPIO5

GPIO6 and GPIO7

GPIO12 and GPIO13: native USB

GPIO16 and GPIO17: UART0

ADC pins

Best analog GPIOs

I²C pins

ESPHome I²C example

SPI pins

Best GPIO for a relay

Best GPIO for a pushbutton

Best GPIO for a DS18B20

Best GPIO for a mmWave sensor

Best pins for PWM

GPIO recommendations table

Why GPIO18 and GPIO19 deserve a note

The best GPIOs to remember

Start here

UART

ADC

Boot/strapping pins

Native USB

Onboard hardware

Arduino IDE setup

Basic Blink test

ESPHome setup

Zigbee, Thread and Matter

C6 SuperMini vs C6 DevKitC

C6 SuperMini vs C3 SuperMini

Common problem: board enters download mode every boot

Common problem: USB disappears after changing GPIOs

Common problem: RGB LED won’t behave like a normal LED

Common problem: ESP32-C6 won’t upload

Common problem: board works from USB but not 5 V pin

Common problem: Wi-Fi works but Zigbee examples don’t

Recommended GPIO recipes

SHT40 / BME280 / OLED

Relay

Button

Analog sensor

UART sensor

PWM output

Extra digital sensors

Suggested beginner pin allocation

ESP32-C6 Datasheets & Documentation

Related ESP32 Guides

Final recommendation

Related posts:

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