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ESP32 WiFi + Bluetooth Module — The Dual-Core Upgrade from ESP8266
The ESP32 ESP-WROOM-32 Module is Espressif's flagship dual-core WiFi + Bluetooth module and the definitive choice for production-grade IoT designs. It packs two Xtensa LX6 cores running at up to 240 MHz, 4 MB flash, 520 KB SRAM, WiFi 802.11 b/g/n, classic Bluetooth, and BLE — all in a compact 18 × 25.5 mm SMD package with castellated pads ready for PCB integration.
It is not a development board — it is the core module that sits at the heart of commercial IoT products, and is the same module used on the popular ESP32 DevKit boards. Choose this when you are ready to go beyond prototyping and into your own PCB design.
ESP32 WROOM-32 vs ESP8266 ESP-12F — when to upgrade
| Feature | ESP32 WROOM-32 | ESP8266 ESP-12F |
|---|---|---|
| CPU cores | 2 × Xtensa LX6, up to 240 MHz | 1 × Tensilica L106, 80/160 MHz |
| RAM | 520 KB SRAM | 80 KB RAM |
| Bluetooth | ✅ Classic BT + BLE 4.2 | ❌ WiFi only |
| GPIO count | 34 programmable GPIOs | 11 usable GPIOs |
| ADC channels | 18 × 12-bit ADC channels | 1 × 10-bit ADC |
| DAC | 2 × 8-bit DAC | ❌ None |
| Touch sensors | 10 capacitive touch pins | ❌ None |
| Hardware encryption | ✅ AES, SHA, RSA, ECC | ❌ Software only |
| Best for | BLE devices, voice, camera, heavy computation | Simple WiFi IoT, low-cost nodes |
Key features
- Dual-core 240 MHz: Run WiFi on one core, application logic on the other
- WiFi + Bluetooth + BLE: All three radios in one module
- 34 GPIO pins: Touch, ADC, DAC, UART, SPI, I2C, I2S, CAN, PWM
- Hardware encryption: AES-128/256, SHA-2, RSA, ECC — secure by design
- 520 KB SRAM: Handle complex data, JSON, audio buffers
- Castellated pads: SMD-solderable to custom PCBs
- PCB antenna + IPEX connector: Use onboard antenna or attach external
Technical specifications
| Model | ESP-WROOM-32 |
|---|---|
| CPU | Dual-core Xtensa LX6, up to 240 MHz |
| Flash Memory | 4 MB SPI Flash |
| SRAM | 520 KB |
| GPIO | 34 programmable pins (ADC, DAC, touch, UART, SPI, I2C, I2S, CAN, PWM) |
| ADC | 18 × 12-bit channels (SAR ADC) |
| DAC | 2 × 8-bit |
| WiFi | 802.11 b/g/n, 2.4 GHz |
| Bluetooth | Classic BT v4.2 + BLE |
| Operating Voltage | 2.7V – 3.6V |
| Dimensions | 18 × 25.5 × 3.1 mm |
| Antenna | Onboard PCB antenna + IPEX connector |
Frequently Asked Questions
Do I need a development board or can I use this module directly? This is the bare module — you need to provide 3.3V power, a USB-to-serial adapter for programming, and boot-mode GPIO control. For prototyping, the ESP32 DevKit board is easier to start with.
Is it compatible with Arduino IDE? Yes. Install the ESP32 board support package from Espressif and select "ESP32 Dev Module".
Does it support OTA updates? Yes. ESP32 supports Over-the-Air firmware updates natively through the Arduino OTA library or ESP-IDF.
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Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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