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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
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: "ESP32C3 Dev Module"▸
Flash Size: "4MB (32Mb)"▸
Flash Mode: "DIO"▸
Partition Scheme: "Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option - leave at default
Board: ESP32C3 Dev Module Flash Size: 4MB (32Mb) Flash Mode: DIO Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32C3 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-c3-devkitm-1⧉ copy
[env:esp32-c3-lyra]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600Find it: PlatformIO Home ▸ Boards, search
esp32-c3-devkitm-1 - or type it after board =.board to selectesp32-c3-devkitm-1⧉ copy
esp32:
board: esp32-c3-devkitm-1
variant: esp32c3
framework:
type: esp-idf
# 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-c3-devkitm-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 esp32c3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-C3 · vs other ESP32 chips →Compute
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 · 1
PWM
6 channels
Power
USB
Micro-USB · Micro-USB (UART)
Serial
CP2102N
Boot address
0x0
Electrical
Input
5V USB · 12V DC
Consumption
-
Regulator
SGM2212-3.3
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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