YJJ ESP32-WROOM-32E Dual-Core WiFi & Bluetooth MCU Module - LoT Wireless Module

Product Description:

YJJ ESP32-WROOM-32E Dual-Core WiFi & Bluetooth MCU Module - IoT Wireless Module

Features:

ESP32: The first-generation dual-core LX6 main control chip

WROOM-32: Standard wireless module series

E: V3 optimized silicon (replacing the old 32D, fixing hardware bugs, RF and security upgrades)

Antenna: Built-in PCB antenna; suffix UE = with U.FL external antenna socket

Flash version: N4 (4MB) / N8 (8MB) / N16 (16MB)

Optional R2 version: Built-in 2MB PSRAM, suitable for voice and image caching

II. Core Hardware Parameters

1. Main Control and Storage

CPU: Dual-core 32-bit Xtensa LX6, adjustable frequency from 80 to 240 MHz, dual-core independent power domains

Internal storage: 448KB ROM + 520KB SRAM + 16KB RTC SRAM

Flash: Standard 4MB, optional 8MB/16MB SPI Flash

High-end R2 model: Additional 2MB Octal PSRAM (for voice and camera caching)

Ultra-low power ULP coprocessor: Independently collects sensor data in sleep mode, micro-ampere-level standby for the entire machine

2. 2.4G WiFi + Bluetooth dual-mode WiFi

Standard: 802.11 b/g/n 1T1R, maximum 150Mbps

Operating channels: 2412~2484MHz, supports STA/AP/Mixed, WiFi Mesh, OTA remote upgrade

Radio optimization: 32E antenna matching circuit upgrade compared to 32D, more stable concurrent connections for multiple devices

Bluetooth 4.2 (BR/EDR + BLE)

Supports BLE Mesh, Bluetooth broadcast pairing, SBC audio encoding, AFH frequency hopping anti-interference

Can work simultaneously with WiFi and Bluetooth, no conflict in hardware radio coexistence scheduling

3. Peripheral resources (up to 26 GPIO)

All GPIO matrices can be freely reused, integrated hardware peripherals:

Communication: 3 UART, I2C, SPI, I2S audio, TWAI (CAN2.0), SDIO

Analog: 8 12-bit SAR ADC, 2 8-bit DAC, capacitive touch sensor

Control: 16 LED PWM, motor-specific PWM, infrared transceiver, pulse counter, hardware watchdog

Supports SD card peripheral expansion for large-capacity storage

4. Electrical, size and environment

Power supply: 3.0~3.6V (typical 3.3V)

Size: 18×17.5×3.2mm, 38Pin standard SMD surface mount, metal shielding cover

Operating temperature: standard version - 40℃~+85℃; high-temperature version up to - 40℃~+105℃

Humidity resistance level: MSL3, supports reflow soldering mass production

Certifications: BQB Bluetooth, FCC/CE radio frequency, RoHS

III. Upgrade points of 32E compared to previous 32D core

Chip upgrade V3 silicon: fixes crystal startup anomaly, PSRAM cache crash, Bluetooth disconnection bug

Security enhancement: supports Secure Boot V2, Flash hardware encryption, suitable for commercial networking devices

Radio optimization: stronger anti-electromagnetic interference, significant improvement in WiFi stability of devices with metal enclosures

Software fully compatible: pin definitions remain unchanged, can be directly pin-to-pin replaced with 32D, no need to modify PCB

Supply stability: Espressif mainly promotes the mass production model, 32D is gradually discontinued, new projects prefer 32E

IV. Simple distinction from ESP32-S3 / ESP32-C3 Table

Model Core Position Key Differences

ESP32-WROOM-32E General IoT Module Dual-core LX6, no AI hardware acceleration, complete peripherals, high cost-performance ratio

ESP32-C3-WROOM-02 Low-cost Minimal IoT RISC-V single-core, smaller in size, only suitable for simple sensor networking

ESP32-S3-WROOM-1 AI Voice / Vision Specialized Dual-core LX7 with AI vector instructions, supports DVP camera, large PSRAM

V. Mainstream Application Scenarios

1. Smart Home (Most Common Scenario)

Smart sockets, wall switches, RGB lighting control, curtain motors, temperature/humidity / human sensing gateway; Bluetooth pairing + WiFi remote control, full-house Mesh linkage.

2.485/CAN to WiFi wireless gateway, industrial equipment remote monitoring

3. Audio, Voice Devices

Bluetooth WiFi dual-mode speaker, voice announcement terminal, simple voice recognition, MP3 player; PSRAM version can cache audio streams.

4. Industrial Automation

Industrial data recorder, equipment status collection, temperature/humidity / pressure online monitoring, PLC wireless expansion, agricultural greenhouse IoT collection node; wide temperature range -40~85℃ suitable for workshops / outdoors.

5. Consumer Electronics and Maker Devices

WiFi remote-controlled car, electronic scale, health detector, shared devices (charging battery / storage cabinet), Arduino/ESP-IDF development learning board.

6. Security and Low-Power Monitoring

Battery-powered outdoor environmental monitoring, warehouse temperature/humidity recorder, access control controller, human sensing alarm device; deep sleep mode for months of battery life.

Specifications: