LuatOS ESP32-C3 Development Board

Overview

LuatOS ESP32-C3 Development Board featuring Espressif's ESP32-C3 single-core RISC-V processor with integrated Wi-Fi 4 and Bluetooth 5.0 LE. A compact, low-cost, and power-efficient development board designed for IoT applications, wireless sensor nodes, smart home devices, and embedded systems. Features USB-Serial/JTAG built-in (no external USB chip needed), compact form factor, and full Arduino IDE / ESP-IDF / LuatOS support. Made by LuatOS — a professional IoT development platform.

Specifications

Parameter	Value
Model	LuatOS ESP32-C3
Chip	Espressif ESP32-C3
CPU	Single-core RISC-V @ 160MHz
Flash Memory	4MB
SRAM	400KB
Wi-Fi	802.11 b/g/n 2.4GHz (Wi-Fi 4)
Bluetooth	BLE 5.0
USB	Built-in USB-Serial/JTAG (no CH340 needed)
GPIO Pins	22 programmable GPIOs
ADC	6 channels × 12-bit (ADC1)
PWM	Up to 6 channels
UART	2×
SPI	3×
I2C	1×
I2S	1×
RMT	4 channels (IR, LED strip)
Operating Voltage	3.3V
Input Voltage	5V via USB-C
Operating Temperature	-40°C to +85°C
Dimensions	~22mm × 18mm

Pin Configuration

Interface	Pins
Digital GPIO	GPIO0 – GPIO21
ADC1	GPIO0 – GPIO5
UART0	GPIO21 (TX), GPIO20 (RX)
UART1	Configurable any GPIO
SPI2	GPIO6 (SCK), GPIO7 (MOSI), GPIO2 (MISO)
I2C	GPIO8 (SDA), GPIO9 (SCL)
USB Serial	GPIO18 (D-), GPIO19 (D+)
Boot	GPIO9 (Boot button)
Reset	EN (Reset button)
Power	3V3, GND, 5V

Features

• RISC-V @ 160MHz — modern open-source ISA architecture
• Built-in USB-Serial/JTAG — no external USB chip, direct USB programming
• Wi-Fi 4 (802.11 b/g/n) — reliable 2.4GHz wireless
• BLE 5.0 — Bluetooth Low Energy for IoT
• 4MB Flash — sufficient for most IoT applications
• 400KB SRAM — generous memory for C3 class
• Ultra compact — tiny form factor for space-constrained designs
• Low power — deep sleep current < 5μA
• Hardware security — RSA, AES, SHA, ECC acceleration
• LuatOS support — Lua scripting language for rapid development
• Arduino IDE compatible — familiar development environment
• MicroPython support — Python on microcontroller
• USB-C connector — modern reversible connector
• Boot + Reset buttons — easy programming and reset
• Onboard LED — GPIO8 or GPIO12 depending on variant

ESP32-C3 vs ESP32 vs ESP8266

Feature	ESP32-C3	ESP32	ESP8266
CPU	RISC-V 160MHz	LX6 240MHz	Tensilica 80MHz
Cores	1	2	1
Wi-Fi	802.11 b/g/n	802.11 b/g/n	802.11 b/g/n
Bluetooth	BLE 5.0	BT4.2+BLE	None
Flash	4MB	4MB typical	1-4MB
SRAM	400KB	520KB	80KB
USB	Built-in	No	No
ADC	6ch 12-bit	18ch 12-bit	1ch 10-bit
GPIO	22	34	17
Price	Low	Medium	Very Low
Best For	IoT + BLE	Complex projects	Simple Wi-Fi

Wiring Common Modules

DHT11/DHT22 Sensor

DHT	ESP32-C3
VCC	3.3V
DATA	GPIO4
GND	GND

SSD1306 OLED (I2C)

OLED	ESP32-C3
VCC	3.3V
GND	GND
SDA	GPIO8
SCL	GPIO9

WS2812B LED Strip

WS2812B	ESP32-C3
VCC	5V
GND	GND
DATA	GPIO8 (RMT)

Relay Module

Relay	ESP32-C3
VCC	5V
GND	GND
IN	GPIO10

Getting Started

Arduino IDE Setup

1. Open Arduino IDE → Preferences
2. Add ESP32 board URL: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
3. Tools → Board Manager → search esp32 → install latest
4. Select ESP32C3 Dev Module
5. Set USB CDC On Boot: Enabled (for built-in USB)
6. Select COM port → Upload!

LuatOS Setup

1. Download LuatOS firmware from https://luatos.com
2. Flash via LuaTools software
3. Write Lua scripts for rapid IoT development

MicroPython Setup

1. Download ESP32-C3 firmware from micropython.org
2. Flash: esptool.py --chip esp32c3 write_flash 0x0 firmware.bin
3. Connect via Thonny IDE

Basic Wi-Fi Example (Arduino)