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Espressif ESP32-Korvo
Versatile audio development platform for ESP32 - supports multiple audio codecs and mic inputs for AI voice tasks.
ESP32
MCU
240MHz
clock
16MB
flash
520KB
SRAM
6· 4 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
8 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 14 | IO14SDIO_CLK | strapping | adc · touch | Reserved SDIO 1-bit expansion/stacking header (JP2, "communicate with another esp system"); footprint present, unpopulated on V1.1. Touch T6 / ADC2_CH6. |
| 2 | 15 | IO15SDIO_CMD | strapping | adc · touch | Reserved SDIO 1-bit expansion/stacking header (JP2); ESP32 strapping pin. Touch T3 / ADC2_CH3. |
| 3 | 2 | IO2SDIO_D0 | strapping | adc · touch | Reserved SDIO 1-bit expansion/stacking header (JP2); ESP32 strapping pin. Touch T2 / ADC2_CH2. |
| 4 | 4 | IO4SDIO_D1 | strapping | adc · touch | Reserved SDIO 1-bit expansion/stacking header (JP2). Touch T0 / ADC2_CH0. |
| 5 | 1 | TXD0TX | uart | uart | UART0 TX; routed to the CP2102N USB-UART bridge (Micro-USB) and to the reserved 3-pin UART/download header next to JP2. |
| 6 | 3 | RXD0RX | uart | uart | UART0 RX; routed to the CP2102N USB-UART bridge (Micro-USB) and to the reserved 3-pin UART/download header next to JP2. |
| 7 | - | 3V3 | power | - | 3.3V rail (AMS1117-3.3) exposed on the reserved expansion header (VDD33). |
| 8 | - | GND | ground | - | Ground, present on the expansion/UART headers. |
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| IO14 | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
| IO15 | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| IO2 | GPIO2 | If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure. | Strapping |
| IO4 | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| TXD0 | U0TXD (GPIO1) | Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console. | USB |
| RXD0 | U0RXD (GPIO3) | Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads. | 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-Korvo breaks out 8 pins in total: 6 GPIO for your project, with 3V3 and GND handling power. Peripheral wiring is straightforward: TX / RX…
The Espressif ESP32-Korvo breaks out 8 pins in total: 6 GPIO for your project, with 3V3 and GND handling power.
Peripheral wiring is straightforward: TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
Beyond plain digital I/O you get 4 ADC-capable pins for sensors and battery monitoring and 4 capacitive-touch inputs.
4 of the exposed pins carry boot-time or system duties on the ESP32 (IO14, IO15, IO2 and 1 more) - check the guidance above before wiring anything to them.
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
The onboard LED on GPIO8 blinks - swap the pin if your board's LED differs.
Set these in Tools · leave everything else at default
Arduino IDE 2.x — Tools Copy
Board: "ESP32 Wrover Module"▸
Flash Size: "16MB (128Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "QSPI PSRAM"▸
Partition Scheme: "16M Flash (3MB APP / 9.9MB FATFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: ESP32 Wrover Module Flash Size: 16MB (128Mb) Flash Mode: DIO PSRAM: QSPI PSRAM Partition Scheme: 16M Flash (3MB APP / 9.9MB FATFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Wrover Module
// blink the onboard LED
void setup() {
pinMode(8, OUTPUT);
}
void loop() {
digitalWrite(8, HIGH); delay(500);
digitalWrite(8, LOW); delay(500);
}board to selectesp32dev⧉ copy
[env:esp32-korvo]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_qspi
build_flags = -DBOARD_HAS_PSRAMFind it: PlatformIO Home ▸ Boards, search
esp32dev — or type it after board =.board to selectesp32dev⧉ copy
esp32:
board: esp32dev
variant: esp32_korvo
framework:
type: esp-idf
psram:
mode: quad
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
esp32dev (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 esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1966080 B · data 327680 B · DIO
Specifications
ESP32Compute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 16MB · 8MB (QSPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
6 · 4
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
Micro-USB (UART) · Micro-USB
Serial
CP2102N
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.88 MB · 320 KB
The Espressif ESP32-Korvo 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 1.88 MB with 320 KB available for data.
About this board
Inside sits the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
At $40.00 it's on the expensive side for an ESP32 board - most land around $20.
Only 6 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Around the module: 8MB (QSPI) PSRAM, a microSD slot, a microphone (Triple analog microphone array), a speaker connector, an audio codec (ES8311), an amplifier (NS4150), an addressable RGB LED (GPIO33), battery charging (AP5056) and Reset/Boot/Play/Set/Vol-/Vol+/Mode/Rec buttons.
The ESP32-Korvo is a powerful AI voice development board based on the ESP32-WROVER module. Designed for speech recognition and audio applications, it integrates an audio codec, multiple microphone inputs, and a DSP for advanced audio processing. The board supports Wi-Fi and Bluetooth connectivity, making it ideal for AI-powered voice assistants, smart home applications, and audio streaming projects.
- ES7210 four-channel audio ADC captures the three-microphone array
- On-board 3.5 mm earphone output
Where to buy
prices are typical street pricesEspressif ESP32-Korvo
$40.00per unit, typical
Resources
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