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Espressif ESP32-C3-Lyra
ESP32-C3 board designed for audio and voice applications - perfect for smart speakers and sound-triggered systems.
ESP32-C3
RISC-V MCU
160MHz
clock
4MB
flash
400KB
SRAM
1· Two 12-bit, 6 Channels ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
17 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3V33.3V | power | - | 3.3V rail (UART header) |
| 2 | - | ENRST | control | - | Chip enable / reset, active low (UART header) |
| 3 | 9 | IO9BOOT | strapping | pwm | GPIO9 BOOT strapping pin; UART download mode (UART header) |
| 4 | - | RXDRX | uart | uart | UART receive (UART header) |
| 5 | - | TXDTX | uart | uart | UART transmit (UART header) |
| 6 | - | GND | ground | - | Ground (UART header) |
| 7 | - | 3V33.3V | power | - | 3.3V rail (I2C header) |
| 8 | - | CLKSCL | safe | i2c | I2C clock (I2C header) |
| 9 | - | SDA | safe | i2c | I2C data (I2C header) |
| 10 | - | GND | ground | - | Ground (I2C header) |
| 11 | - | VCC | power | - | Addressable LED strip power (JP2) |
| 12 | - | DIN | safe | - | Addressable LED strip data in (JP2) |
| 13 | - | GND | ground | - | Ground (JP2) |
| 14 | - | VCC | power | - | RGB LED strip power (JP1) |
| 15 | - | GGreen | safe | - | RGB LED strip green channel (JP1) |
| 16 | - | RRed | safe | - | RGB LED strip red channel (JP1) |
| 17 | - | BBlue | safe | - | RGB LED strip blue channel (JP1) |
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| IO9 | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | Strapping |
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 17 pins, the Espressif ESP32-C3-Lyra exposes 1 GPIO plus 3V3 , GND and VCC for power. Beyond plain digital I/O you get PWM on every GPIO. 1 of the…
Across 17 pins, the Espressif ESP32-C3-Lyra exposes 1 GPIO plus 3V3, GND and VCC for power.
Beyond plain digital I/O you get PWM on every GPIO.
1 of the exposed pins carry boot-time or system duties on the ESP32-C3 (IO9) - check the guidance above before wiring anything to them.
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 GPIO8 - swap for your board's LED pin if different.
Board: Esp32 C3 Lyra
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(8, OUTPUT);
digitalWrite(8, LOW); // on (often inverted)[env:esp32-c3-lyra]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-c3-devkitm-1
variant: esp32_c3_lyra
framework:
type: esp-idf
# blink - GPIO8
output:
- platform: gpio
pin: 8
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32c3 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-C3Compute
MCU
ESP32-C3 · RISC-V
Clock
160 MHz
SRAM · Flash
400 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
1 · Two 12-bit, 6 Channels
UART · I²C · SPI
2 · 1 · 3
PWM
6 channels
Power
USB
Micro-USB · Micro-USB (UART)
Serial
CP2102N
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
The Espressif ESP32-C3-Lyra 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 1.25 MB with 320 KB available for data.
About this board
Inside sits the ESP32-C3 - a single-core RISC-V and the budget low-power pick.
At $28.00 it's on the expensive side for an ESP32-C3 board - most land around $10.
Only 1 GPIO are broken out, where most ESP32-C3 boards manage about 13 - worth checking the pinout covers what you need.
Around the module: a microphone (ECM), a speaker connector (2.0mm pitch), an amplifier (NS4150), an addressable RGB LED (GPIO10), an IR transceiver, status LEDs (Power) and Boot/Reset/Mode/Color/Play/Pause/Set/Vol+/Vol- buttons.
The ESP32-C3-Lyra is an audio development board based on the ESP32-C3 module, designed for controlling light with audio. It features a built-in ECM microphone, speaker power amplifier, and speaker connector, making it ideal for applications such as audio broadcasters and rhythm light strips. The board also supports infrared (IR) transmitting and receiving, and provides connectors for both addressable and RGB LED strips.
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
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