YJJ ESP32-C3-WROOM-02-N4 2.4GHz WiFi + Bluetooth BLE5.0 Wireless Module

Product Specification

Product Description:

YJJ ESP32-C3-WROOM-02-N4 2.4GHz WiFi + Bluetooth BLE5.0 Wireless Module

Features:

I. Basic Information

Brand Manufacturer: Espressif (Shanghai, China)

Model Interpretation

ESP32-C3: Built-in RISC-V single-core main control chip

WROOM-02: Standard SMD wireless module series

N4: 4MB Quad SPI Flash, industrial temperature range -40℃~+85℃

Antenna: Built-in PCB antenna (no U.FL socket, differentiated by suffix 02U for external antenna model)

Package: 19-pin SMD surface mount module, size 18×20×3.2mm

II. Core Hardware Parameters

1. Processor and Storage

CPU: 32-bit RISC-V single-core, maximum 160MHz

ROM: 384KB

SRAM: 400KB (16KB Cache) + 8KB RTC SRAM

Flash: 4MB (N4 represents 4M, N8 is 8M)

Built-in 40MHz high-precision crystal oscillator Espressif Systems

2. Wireless Communication (Wi-Fi + BLE Dual)

Wi-Fi 2.4G

Standard: 802.11 b/g/n, 1T1R

Bandwidth: 20MHz/40MHz, maximum speed 150Mbps

Channel: 2412~2484MHz (1~13 channels)

Mode: Station / SoftAP / Hybrid Dual Mode, supports 4 virtual Wi-Fi

Transmission power: 20.5dBm; Reception sensitivity - 105dBm

Functions: FTM ranging, WMM, frame aggregation, antenna diversity

Bluetooth 5.0 BLE

Rate: 125K/500K/1M/2Mbps

Support: BLE Mesh, broadcast extension, multi-broadcast set

Wi-Fi/Bluetooth antennas shared, built-in coexistence scheduling, no mutual interference Espressif Systems

3. Peripheral Resources (15 GPIOs)

All GPIOs can be reprogrammed, integrated hardware peripherals:

Communication: UART×2, I2C, SPI, I2S audio, TWAI (CAN2.0), USB (serial port / JTAG debugging dual-purpose)

Analog: 8 channels SAR ADC (12bit), built-in chip temperature sensor

Control: LED PWM multi-output, infrared remote control, general DMA, hardware watchdog, timer

3 GPIOs for strapping startup configuration pins, power-on mode selection Espressif Systems

4. Electrical and Power Consumption

Supply voltage: 3.0V ~ 3.6V (typical 3.3V)

Peak transmission current: 280~345mA

Wi-Fi reception current: 82mA

Low power sleep: RTC deep sleep only several μA level, suitable for battery devices

Operating temperature: -40℃ ~ +85℃ (N series is normal industrial grade; H4 is - 40~105℃ high-temperature model)

Dust resistance level: MSL3, surface mount reflow soldering compatible

5. Structural Packaging

Surface mount 19-pin, metal shielding cover anti-interference

Built-in PCB antenna, no need for additional external antenna, simplifies the overall structure

III. Quick Differentiation of Similar Series Models Table

Model Flash Antenna Temperature Range

ESP32-C3-WROOM-02-N4 4MB Board-mounted PCB -40~85℃

ESP32-C3-WROOM-02-N8 8MB Board-mounted PCB -40~85℃

ESP32-C3-WROOM-02U-N4 4MB External U.FL antenna -40~85℃

ESP32-C3-WROOM-02-H4 4MB Board-mounted PCB -40~105℃ (High Temperature)

Four. Core Advantages of the Product

RISC-V open architecture, no ARM licensing fees, lower cost and higher production cost performance

Single module Wi-Fi + BLE, supports Bluetooth pairing, wireless data transmission, Mesh networking

Rich peripherals: can directly connect sensors, displays, motors, CAN bus, audio speakers

Ultra-low sleep power consumption, suitable for lithium battery-powered portable devices

Compact size, shielded design, easy to pass certifications for home appliances / industrial electromagnetics

Official ESP-IDF and Arduino open-source development frameworks of LeCang, low development threshold

Five. Main Application Scenarios

1. Smart Home (Max Usage Scenario)

Wi-Fi smart sockets, switches, lighting controllers, curtain motors

Temperature humidity / human infrared / gas sensor networking terminals

Smart small appliances: humidifiers, purifiers, water dispensers, foot baths

2. Industrial Automation (Compatible - 40~85℃ wide temperature range)

Industrial wireless acquisition terminal: collects voltage, current, temperature humidity, gas sensor data (paired with the SO-E2-960, MSA gas sensors you previously consulted)

CAN bus wireless gateway, remote equipment monitoring, 485 to Wi-Fi transmission module

Wireless data transmission for instruments, wireless data upload for inspection instruments

3. Consumer Electronics and Wearable Devices

Bluetooth/Wi-Fi dual-mode bracelet, health detectors, weighing scales

Wireless voice players, Bluetooth speakers, I2S audio devices

Remote control devices, infrared forwarding gateways

4. Internet of Things collection, security equipment

Battery-powered low-power collectors (field environment monitoring, warehouse temperature humidity)

Wireless access control, human sensing alarm, camera sub-board

Shared devices (power banks, bike-sharing positioning communication board)

5. Education, DIY development

Internet of Things teaching development board, maker projects, wireless control experimental platform

Specifications: