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Espressif ESP32-LyraT-Mini
Compact LyraT variant for simpler voice/audio apps - great for speaker-based IoT interfaces.
ESP32
MCU
240MHz
clock
4MB
flash
520KB
SRAM
6· 4 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
8 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 15 | MTDOTDOGPIO15 | strapping | adc · touch | JTAG header pin 1 (TDO); strapping pin; shared with the microSD CMD line |
| 2 | 13 | MTCKTCKGPIO13 | strapping | adc · touch | JTAG header pin 2 (TCK); shared with the microSD power-control line |
| 3 | 12 | MTDITDIGPIO12 | strapping | adc · touch | JTAG header pin 3 (TDI); strapping pin (flash voltage select), no onboard peripheral |
| 4 | 14 | MTMSTMSGPIO14 | strapping | adc · touch | JTAG header pin 4 (TMS); shared with the microSD CLK line |
| 5 | 3 | RXU0RXDGPIO3 | uart | uart | UART header pin 1; USB-UART console/programming RX (U0RXD) |
| 6 | 1 | TXU0TXDGPIO1 | uart | uart | UART header pin 2; USB-UART console/programming TX (U0TXD) |
| 7 | - | GND | ground | - | UART header pin 3; ground |
| 8 | - | 3V33.3V | power | - | UART header pin 4; 3.3V power |
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| MTDO | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| MTCK | MTCK (GPIO13) | Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed. | Other |
| MTDI | MTDI (GPIO12) | Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used. | Strapping |
| MTMS | MTMS (GPIO14) | Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| RX | 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 |
| TX | 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 |
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 Across 8 pins, the Espressif ESP32-LyraT-Mini exposes 6 GPIO plus GND and 3V3 for power. For peripherals, TX/RX on GPIO1 and GPIO3 cover serial logging and…
Across 8 pins, the Espressif ESP32-LyraT-Mini exposes 6 GPIO plus GND and 3V3 for power.
For peripherals, TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
On the analog side there are 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 (MTDO, MTCK, MTDI and 1 more).
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: "ESP32 Wrover Module"▸
Flash Size: "4MB (32Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "QSPI PSRAM"▸
Partition Scheme: "Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option - leave at default
Board: ESP32 Wrover Module Flash Size: 4MB (32Mb) Flash Mode: DIO PSRAM: QSPI PSRAM Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Wrover 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 selectesp32dev⧉ copy
[env:esp32-lyrat-mini]
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
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 0x1000 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1966080 B · data 327680 B · DIO
Specifications
ESP32 · vs other ESP32 chips →Compute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 4MB · 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 · 2
PWM
16 channels
Power
USB
Micro-USB (UART) · Micro-USB
Serial
CP2102N
Boot address
0x1000
Electrical
Input
5V USB · Li-ion battery
Consumption
-
Regulator
-
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.88 MB · 320 KB
The Espressif ESP32-LyraT-Mini 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
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $18.00 - in line with other ESP32 boards.
Only 6 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Onboard you'll find 8MB (QSPI) PSRAM, a microSD slot, a microphone, a speaker connector (2.0mm socket), an audio codec (ES8311), an amplifier (NS4150), battery charging (AP5056) via 2.0mm 2-pin socket, status LEDs (Green, Red, Charging, Standby, Power) and Boot/Reset/Rec/Mode/Play/Set/Vol-/Vol+ buttons.
The ESP32-LyraT-Mini is a compact development board designed for audio applications. It features an ESP32-WROVER module with built-in Wi-Fi and Bluetooth, an ES7243 audio ADC, and an ES8311 audio codec. The board is ideal for voice interaction applications such as smart speakers and voice-controlled devices. It supports I2S, UART, I2C, and SPI for seamless integration with various peripherals.
- 3.5mm stereo headphone jack
- 3-watt mono speaker output (4Ω recommended)
- ES7243 audio ADC for the onboard microphone
- Six audio function keys (Rec, Mode, Play, Set, Vol-, Vol+)
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
Board datasheet docs.espressif.com↗ ESP32 datasheet espressif.com↗ ESP32-LyraT-Mini V1.2 Hardware Reference docs.espressif.com↗ESP32-LyraT-Mini V1.2 Schematic (PDF) dl.espressif.com↗ESP-ADF audio_board lyrat_mini_v1_1 board_pins_config.c github.com↗ESP-ADF audio_board lyrat_mini_v1_1 board_def.h github.com↗
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