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The ESP32-WROOM-32E-SMD (specifically the version marked XX0H23) is an enhanced, highly integrated Wi-Fi and Bluetooth module designed for mass-market IoT applications. The "E" series represents a hardware revision that improves security and fixes minor bugs found in the original modules. 🚀
🔍 Understanding the "XX0H28" Marking
The specific marking on your shield provides critical details about the module's internal configuration:
- H28: Indicates that the module is equipped with 16 MB of Flash memory. 💾
- 3: Refers to the ESP32-D0WD-V3 silicon revision (ECO V3), which includes a hardware fix for certain security vulnerabilities (Fault Injection) and improved power management. ⚡
🧠 Processing Power
- Dual-Core CPU: Powered by two Xtensa® 32-bit LX6 microprocessors running at up to 240 MHz. 🧠
- Co-Processor: Includes an ultra-low-power (ULP) co-processor for monitoring sensors while the main cores are in deep sleep. 💤
- Internal Memory: 520 KB SRAM for high-speed data processing. 🏗️
📡 Wireless Connectivity
- Wi-Fi: Supports 802.11 b/g/n (up to 150 Mbps). 🌐
- Bluetooth: Dual-mode support for Bluetooth Classic (v4.2) and Bluetooth Low Energy (BLE). 📱
- PCB Antenna: Features a built-in "MIFA" trace antenna, so no external antenna is required for standard range. 📶
⚙️ Hardware Specifications
- Operating Voltage: 3.0V to 3.6V (Standard 3.3V recommended). ⚡
- Form Factor: 38-pin SMD module (18mm x 25.5mm). 📏
- Peripherals: Integrated SPI, UART, I2C, I2S, PWM, ADC, and DAC interfaces. 🔗
- Certifications: Fully certified (FCC/CE/IC/SRRC), making it ready for commercial products. ✅
💡 Shop Note
This is the 'ECO V3' version of the ESP32, which means it’s more secure and more power-efficient than the older models. Because it has the 16MB flash (H28), it's a great choice for projects that need the power of the ESP32 but don't require massive code libraries. Just a reminder for your build: since it has a built-in antenna, try to keep the antenna area clear of metal and wires for the best Wi-Fi signal!"