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Espressif ESP32-S3-Korvo-1
Advanced ESP32-S3 audio dev board with mic array and speaker amp - ideal for smart voice interfaces and audio AI.
ESP32-S3
MCU
240MHz
clock
16MB
flash
512KB
SRAM
5· Two 12-bit, 20 Channels ADC
GPIO
BLE 5.0+ WiFi
radio
Espressif ESP32-S3-Korvo-1 Pinout
11 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3.3V3V3 | power | - | UART/prog header; 3.3V power/reference for serial adapter |
| 2 | 43 | IO43TXD | uart | uart · pwm | UART/prog header; UART0 TX (U0TXD) |
| 3 | 44 | IO44RXD | uart | uart · pwm | UART/prog header; UART0 RX (U0RXD) |
| 4 | - | GND | ground | - | UART/prog header; ground |
| 5 | 37 | IO37 | strapping | pwm | GPIO expansion header (37/36/35) |
| 6 | 36 | IO36 | strapping | pwm | GPIO expansion header (37/36/35) |
| 7 | 35 | IO35 | strapping | pwm | GPIO expansion header (37/36/35) |
| 8 | - | D1 | safe | - | SDIO header; SD/SDIO data line 1 (GPIO not silked) |
| 9 | - | D0 | safe | - | SDIO header; SD/SDIO data line 0 (GPIO not silked) |
| 10 | - | CMD | safe | - | SDIO header; SD/SDIO command line (GPIO not silked) |
| 11 | - | CLK | safe | - | SDIO header; SD/SDIO clock line (GPIO not silked) |
5 GPIOs broken out 0 free · 2 need care · 3 to avoid
Fine - with a little care
2 pins · 2 things to knowIO43 UART0 transmit pin (U0TXD), default serial console TX UART
Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0).
IO44 UART0 receive pin (U0RXD), default serial console RX UART
Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip.
Only if you know the tricks
3 pins · 1 thing to knowIO37IO36IO35 Octal (8-line) flash/PSRAM data and strobe lines on R8/R16V modules; free on quad-PSRAM and PSRAM-less parts Flash
The datasheet keeps GPIO33-37 for "the higher 4 bits data line interface and DQS interface for the SPI0/1 interface in 8-line SPI mode", so octal-PSRAM modules (N16R8 and friends) consume it and do not break it out. On quad-PSRAM or PSRAM-less parts it is an ordinary GPIO - check which variant your module carries.
- IO37Octal (8-line) flash/PSRAM data strobe DQS/DM on R8/R16V modules; free on quad-PSRAM and PSRAM-less parts
- IO36Octal (8-line) flash/PSRAM data line DQ7 on R8/R16V modules; free on quad-PSRAM and PSRAM-less parts
- IO35Octal (8-line) flash/PSRAM data line DQ6 on R8/R16V modules; free on quad-PSRAM and PSRAM-less parts
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.
The Espressif ESP32-S3-Korvo-1 pinout brings out 11 pins - 5 usable GPIO alongside the 3.3V and GND power rails.
On the analog side there are PWM on every GPIO.
2 of the exposed pins carry boot-time or system duties on the ESP32-S3 (IO43 and IO44).
Pinout notes The ESP32-S3-Korvo-1 consists of a main board and a sub-board. The main board integrates the ESP32-S3-WROOM-1 module, function buttons, an SD card slot, a…
The ESP32-S3-Korvo-1 consists of a main board and a sub-board. The main board integrates the ESP32-S3-WROOM-1 module, function buttons, an SD card slot, a speaker, and USB connectors. The sub-board, known as ESP32-Korvo-Mic, contains a three-microphone array, function buttons, and addressable LEDs. The main board and sub-board are connected via an FPC cable, providing access to various GPIOs and interfaces suitable for audio and voice applications.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) if no port appears. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
GPIO8 toggles - wire an LED and resistor to it, or change the pin to your board's own LED.
Set these in Tools · leave everything else at default
Arduino IDE 2.x - Tools Copy
Board: "ESP32S3 Dev Module"▸
Flash Size: "16MB (128Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "OPI PSRAM"▸
Partition Scheme: "16M Flash (3MB APP/9.9MB FATFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option - leave at default
Board: ESP32S3 Dev Module Flash Size: 16MB (128Mb) Flash Mode: DIO PSRAM: OPI PSRAM Partition Scheme: 16M Flash (3MB APP/9.9MB FATFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32S3 Dev Module
// toggle GPIO8 - wire an LED and resistor to it
void setup() {
pinMode(8, OUTPUT);
}
void loop() {
digitalWrite(8, HIGH); delay(500);
digitalWrite(8, LOW); delay(500);
}board to selectesp32-s3-devkitc-1⧉ copy
[env:esp32-s3-korvo-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_opi
build_flags = -DBOARD_HAS_PSRAMFind it: PlatformIO Home ▸ Boards, search
esp32-s3-devkitc-1 - or type it after board =.board to selectesp32-s3-devkitc-1⧉ copy
esp32:
board: esp32-s3-devkitc-1
variant: esp32s3
framework:
type: esp-idf
psram:
mode: octal
speed: 80MHz
# blink - GPIO8
output:
- platform: gpio
pin: 8
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32-s3-devkitc-1 (same ids as PlatformIO).esptool doesn't pick board settings - a prebuilt .bin already has them baked in. This is just the raw flash command.
esptool.py --chip esp32s3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 16777216 B · data 327680 B · DIO
Specifications
ESP32-S3 · vs other ESP32 chips →Compute
MCU
ESP32-S3
Clock
240 MHz
SRAM · Flash
512 KB · 16MB · 8MB (OPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
5 · Two 12-bit, 20 Channels
UART · I²C · SPI
3 · 2 · 2
PWM
8 channels
Power
USB
Micro-USB (UART) · Micro-USB
Serial
-
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
16 MB · 320 KB
The Espressif ESP32-S3-Korvo-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 16 MB with 320 KB available for data.
About this board
At its core is the ESP32-S3 - a dual-core Xtensa with vector extensions suited to AI workloads.
Expect to pay about $50.00 - above the ~$29 typical for ESP32-S3 boards.
Only 5 GPIO are broken out, where most ESP32-S3 boards manage about 22 - worth checking the pinout covers what you need.
Onboard you'll find 8MB (OPI) PSRAM, a microSD slot, a microphone (3-mic array), a speaker connector, an audio codec (ES8311), an amplifier, an addressable RGB LED and Reset/Boot/6x Function buttons.
The ESP32-S3-Korvo-1 is an AI development board produced by Espressif, based on the ESP32-S3 SoC and ESP-Skainet, Espressif's speech recognition SDK. It features a three-microphone array suitable for far-field voice pick-up with low power consumption. The board supports voice wake-up and offline speech command recognition in Chinese and English languages, making it ideal for developing applications such as smart displays, smart plugs, and smart switches.
- ES7210 four-channel audio ADC captures the 3-microphone array
- 3-microphone array with 65 mm spacing for far-field voice pickup
- 3.5 mm stereo headphone output jack
- 3 W mono class-D speaker amplifier (4Ω 3W speaker recommended)
- 12x WS2812C addressable RGB LEDs on the ESP32-Korvo-Mic sub-board
- Two-board design: ESP32-S3-Korvo-1 main board and ESP32-Korvo-Mic sub-board joined by an FPC cable
- ESP32-S3-WROOM-1 (N16R8) module with 16 MB flash and 8 MB octal PSRAM
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
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