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Espressif ESP32-S3-DevKitC-1
Full-featured ESP32-S3 dev board with USB, PSRAM, and rich I/O - perfect for AIoT prototyping and embedded apps.
70 × 28 mm
ESP32-S3
MCU
240MHz
clock
8MB
flash
512KB
SRAM
36· 20 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
44 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3V33.3V | power | - | 3.3V regulated output |
| 2 | - | 3V33.3V | power | - | 3.3V regulated output |
| 3 | - | RSTEN | control | - | Chip reset (active low) |
| 4 | 4 | IO4A4T4 | safe | adc · touch · pwm | ADC1_CH3; TOUCH4; RTC |
| 5 | 5 | IO5A5T5 | safe | adc · touch · pwm | ADC1_CH4; TOUCH5; RTC |
| 6 | 6 | IO6A6T6 | safe | adc · touch · pwm | ADC1_CH5; TOUCH6; RTC |
| 7 | 7 | IO7A7T7 | safe | adc · touch · pwm | ADC1_CH6; TOUCH7; RTC |
| 8 | 15 | IO15A15 | uart | adc · uart · pwm | ADC2_CH4; UART0 RTS; XTAL_32K_P; RTC |
| 9 | 16 | IO16A16 | uart | adc · uart · pwm | ADC2_CH5; UART0 CTS; XTAL_32K_N; RTC |
| 10 | 17 | IO17A17 | uart | adc · uart · pwm | ADC2_CH6; UART1 TX; RTC |
| 11 | 18 | IO18A18 | uart | adc · uart · pwm | ADC2_CH7; UART1 RX; CLK_OUT3; RTC |
| 12 | 8 | IO8A8T8 | safe | adc · touch · pwm | ADC1_CH7; TOUCH8; RTC |
| 13 | 3 | IO3A3T3 | strapping | adc · touch · pwm | ADC1_CH2; TOUCH3; JTAG; RTC |
| 14 | 46 | IO46 | strapping | pwm | General-purpose GPIO; ROM log control |
| 15 | 9 | IO9A9T9 | strapping | adc · touch · spi · pwm | ADC1_CH8; TOUCH9; FSPIHD; RTC |
| 16 | 10 | IO10A10T10SS | strapping | adc · touch · spi · pwm | ADC1_CH9; TOUCH10; FSPICS0 (default SPI SS); RTC |
| 17 | 11 | IO11A11T11MOSI | strapping | adc · touch · spi · pwm | ADC2_CH0; TOUCH11; FSPID (default SPI MOSI); RTC |
| 18 | 12 | IO12A12T12SCK | strapping | adc · touch · spi · pwm | ADC2_CH1; TOUCH12; FSPICLK (default SPI SCK); RTC |
| 19 | 13 | IO13A13T13MISO | strapping | adc · touch · spi · pwm | ADC2_CH2; TOUCH13; FSPIQ (default SPI MISO); RTC |
| 20 | 14 | IO14A14T14 | strapping | adc · touch · spi · pwm | ADC2_CH3; TOUCH14; FSPIWP; RTC |
| 21 | - | 5V | power | - | 5V input (from USB) / output |
| 22 | - | GND | ground | - | Ground |
| 23 | - | GND | ground | - | Ground |
| 24 | 43 | IO43TX | strapping | uart · pwm | UART0 TX; CLK_OUT1 |
| 25 | 44 | IO44RX | strapping | uart · pwm | UART0 RX; CLK_OUT2 |
| 26 | 1 | IO1A1T1 | safe | adc · touch · pwm | ADC1_CH0; TOUCH1; RTC |
| 27 | 2 | IO2A2T2 | safe | adc · touch · pwm | ADC1_CH1; TOUCH2; RTC |
| 28 | 42 | IO42 | strapping | pwm | JTAG MTMS |
| 29 | 41 | IO41 | strapping | pwm | JTAG MTDI; CLK_OUT1 |
| 30 | 40 | IO40 | strapping | pwm | JTAG MTDO; CLK_OUT2 |
| 31 | 39 | IO39 | strapping | pwm | JTAG MTCK; CLK_OUT3 |
| 32 | 38 | IO38 | strapping | spi · pwm | Onboard RGB LED (v1.1); FSPIWP |
| 33 | 37 | IO37 | strapping | spi · pwm | SPIDQS; FSPIQ; octal PSRAM on R8/R16 variants |
| 34 | 36 | IO36 | strapping | spi · pwm | SPIIO7; FSPICLK; octal PSRAM on R8/R16 variants |
| 35 | 35 | IO35 | strapping | spi · pwm | SPIIO6; FSPID; octal PSRAM on R8/R16 variants |
| 36 | 0 | IO0 | strapping | pwm | Onboard BOOT button |
| 37 | 45 | IO45 | strapping | pwm | General-purpose GPIO |
| 38 | 48 | IO48 | strapping | pwm | SPICLK_N; RGB LED on early v1.0 boards |
| 39 | 47 | IO47 | strapping | pwm | SPICLK_P |
| 40 | 21 | IO21 | safe | pwm | General-purpose GPIO; RTC |
| 41 | 20 | IO20A20 | uart | adc · uart · pwm | USB D+ (native USB); ADC2_CH9; UART1 CTS; RTC |
| 42 | 19 | IO19A19 | uart | adc · uart · pwm | USB D- (native USB); ADC2_CH8; UART1 RTS; RTC |
| 43 | - | GND | ground | - | Ground |
| 44 | - | GND | ground | - | Ground |
Start with these
12 pins with no boot or system involvementIO4A4IO5A5IO6A6IO7A7IO15A15IO16A16IO17A17IO18A18IO8A8IO1A1IO2A2IO21
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| IO3 | GPIO3 | Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface. | Strapping |
| IO46 | GPIO46 | Must be at a defined level during reset (with GPIO0) to select normal or download boot and UART/USB print mode. This pin is input-only (no output drive), so it should be left for its intended strapping function. | Strapping |
| IO43 | U0TXD (GPIO43) | Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0). | Other |
| IO44 | U0RXD (GPIO44) | Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip. | Other |
| IO42 | MTMS (GPIO42) | Default JTAG TMS signal for debugging. Using this pin for other purposes will disable the JTAG interface (unless JTAG is rerouted to USB). | Other |
| IO41 | MTDI (GPIO41) | Default JTAG TDI input for debugging. Should be reserved for JTAG or left unused if JTAG is to remain available. | Other |
| IO40 | MTDO (GPIO40) | Default JTAG TDO output for debugging. Using it as GPIO will interfere with JTAG debugging functionality. | Other |
| IO39 | MTCK (GPIO39) | Default JTAG debugging TCK pin. If JTAG is needed, this pin must be free; it may also be used internally for PSRAM chip select on certain modules, so avoid repurposing it. | Other |
| IO0 | GPIO0 | Must be pulled high (default) or low (to enter UART download mode) at reset. Using it for other functions can interfere with boot mode configuration. | Strapping |
| IO45 | GPIO45 | Determines flash/PSRAM power voltage (3.3 V vs 1.8 V) at boot. Must match hardware configuration; using as GPIO can upset flash supply setting. | Strapping |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO9 | FSPIHD | Connected to external flash (data/hold signal) on most modules. Not recommended for use as GPIO, since it must remain dedicated to flash communication. | Flash |
| IO10 | FSPICS0 | Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity | Flash |
| IO11 | FSPID | Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use. | Flash |
| IO12 | FSPICLK | Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO. | Flash |
| IO13 | FSPIQ | Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected. | Flash |
| IO14 | FSPIWP | Connected to external flash (data/write-protect signal). Not recommended as GPIO because it’s reserved for flash operations. | Flash |
| IO38 | FSPIWP | On flash-equipped chips, this pin is tied to the flash’s WP# (or D3) line. It should be avoided for other use, as it’s needed for flash operations. | Flash |
| IO37 | FSPIQ / PSRAM_DQS | In modules with octal PSRAM, this pin is connected to the PSRAM’s DQS signal. It cannot be repurposed without disrupting the PSRAM/flash communication. | Flash |
| IO36 | FSPICLK / PSRAM_CLK | In modules with octal PSRAM, this pin drives the PSRAM clock. It must be dedicated to the memory interface, not used as a regular GPIO when that interface is in use. | Flash |
| IO35 | FSPID / PSRAM_D0 | In modules with octal PSRAM, this pin is connected to the PSRAM data line. It is reserved for memory interface and not free for general GPIO when flash/PSRAM is present. | Flash |
| IO48 | SPICLK_N | Used only on variants with Octal SPI interface, as the negative leg of the differential clock&. On such chips it operates at 1.8 V; it should be avoided for GPIO to prevent conflicts with the octal flash/PSRAM clock. | Flash |
| IO47 | SPICLK_P | Used only on variants with Octal SPI interface (e.g. ESP32-S3R16V) as part of the differential clock pair. On such chips it operates at 1.8 V and is reserved for the high-speed octal SPI clock, not for general GPIO use. | Flash |
| IO20 | USB_D+ | By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality. | USB |
| IO19 | USB_D- | By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality. | USB |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes The Espressif ESP32-S3-DevKitC-1 breaks out 44 pins in total: 36 GPIO for your project, with 3V3 , 5V and GND handling power. Peripheral wiring is…
The Espressif ESP32-S3-DevKitC-1 breaks out 44 pins in total: 36 GPIO for your project, with 3V3, 5V and GND handling power.
Peripheral wiring is straightforward: the SPI bus (MOSI, MISO, SCK, SS) is broken out in full, while TX/RX on GPIO43 and GPIO44 cover serial logging and flashing.
Beyond plain digital I/O you get 20 ADC-capable pins for sensors and battery monitoring, PWM on every GPIO and 14 capacitive-touch inputs.
10 of the exposed pins carry boot-time or system duties on the ESP32-S3 (IO3, IO46, IO43 and 7 more) - check the guidance above before wiring anything to them. IO4, IO5, IO6, IO7 and 8 more are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: CP2102N. Not detected? Hold BOOT while plugging in.
2
Flash with your tool
Arduino IDE, PlatformIO, ESPHome or esptool - copy the settings on the right.
3
Verify it runs
The blink example uses GPIO4 - swap for your board's LED pin if different.
Board: Esp32 S3 Devkitc 1
Flash Size: 8MB · DIO
Upload Speed: 921600
// blink
pinMode(4, OUTPUT);
digitalWrite(4, LOW); // on (often inverted)[env:esp32-s3-devkitc-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-s3-devkitc-1
variant: esp32_s3_devkitc_1
framework:
type: esp-idf
# blink - GPIO4
output:
- platform: gpio
pin: 4
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32s3 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 2097152 B · data 327680 B · DIO
Specifications
ESP32-S3 · 70 × 28 mmCompute
MCU
ESP32-S3
Clock
240 MHz
SRAM · Flash
512 KB · 8MB · 8MB (OPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
36 · 20
UART · I²C · SPI
3 · 2 · 4
PWM
8 channels
Power
USB
Micro-USB (UART) · Micro-USB (native)
Serial
CP2102N
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
2 MB · 320 KB
70 × 28 mm · pin pitch 2.54 mm
The Espressif ESP32-S3-DevKitC-1 uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode. The maximum sketch size is 2 MB with 320 KB available for data.
About this board
Inside sits the ESP32-S3 - a dual-core Xtensa with vector extensions suited to AI workloads.
At $15.00 it's cheaper than most ESP32-S3 boards, which usually run around $30.
With 36 GPIO broken out, you get more pins to play with than most ESP32-S3 boards offer.
Around the module: 8MB (OPI) PSRAM, an addressable RGB LED (GPIO38) and Boot/Reset buttons.
- Sold in memory variants: N8 (8MB flash, no PSRAM), N8R2 (8MB flash + 2MB quad PSRAM), N8R8 (8MB flash + 8MB octal PSRAM), N16R8 (16MB flash + 8MB octal PSRAM)
- Addressable RGB LED on GPIO38 on board revision v1.1; early v1.0 boards and many clones drive it on GPIO48
- ESP32-S3-WROOM-1U variant swaps the PCB antenna for a u.FL external antenna connector
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
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