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Overview
The ESP32-WROOM-32 38 Pin NodeMCU is a powerful development board that integrates the ESP32-WROOM-32 module. This module is based on the ESP32 chip, which features a ESP32-D0WDQ6 dual-core processors based on the Xtensa® dual-core 32-bit LX6 architecture, Wi-Fi 802.11 b/g/n, and Bluetooth BLE (Bluetooth Low Energy) and Bluetooth v4.2 connectivity, making it ideal for IoT applications.
Applications
- Smart home devices (lighting control, security systems)
- Industrial automation
- Environmental monitoring (weather stations)
- Remote control systems
- Prototyping IoT applications
Specification
| Module | ESP32-WROOM-32 |
|---|---|
| Processor | ESP32-D0WDQ6 Xtensa® dual-core 32-bit LX6 microprocessor |
| Clock Speed | upto 240 MHz |
| SRAM | 520 KB 16KB in RTC |
| ROM | 448 KB |
| Flash Memory | 4 MB |
| Wireless | Wi-Fi: 802.11 b/g/n Bluetooth: BLE (Bluetooth Low Energy) and Bluetooth v4.2 |
| Input Voltage | 5V via USB |
| Operating Voltage | 3.3V |
| IO Peripherals | 18 Analog-to-Digital Converter (ADC) channels 2 Digital-to-Analog Converters (DAC) 16 PWM channels 3 SPI interfaces 3 UART interfaces 2 I2C interfaces 10 Capacitive Touch Sensors |
Pinout
Pinout for ESP32 NodeMCU 38 Pins
| Pin | Type | Pin | |
|---|---|---|---|
| 3V3 | Power | Ground | GND |
| EN | Enable | GPIO23 | G23 |
| SP | GPIO36 | GPIO22 | G22 |
| SN | GPIO39 | GPIO1 | TXD |
| G34 | GPIO34 | GPIO3 | RXD |
| G35 | GPIO35 | GPIO21 | G21 |
| G32 | GPIO32 | Ground | GND |
| G33 | GPIO33 | GPIO19 | G19 |
| G25 | GPIO25 | GPIO18 | G18 |
| G26 | GPIO26 | GPIO5 | G5 |
| G27 | GPIO27 | GPIO17 | G17 |
| G14 | GPIO14 | GPIO16 | G16 |
| G12 | GPIO12 | GPIO4 | G4 |
| GND | Ground | GPIO0 | G0 |
| G13 | GPIO13 | GPIO2 | G2 |
| SD2 | GPIO9 | GPIO15 | G15 |
| SD3 | GPIO10 | GPIO8 | SD1 |
| CMD | GPIO11 | GPIO7 | SD0 |
| 5V | Power | GPIO6 | CLK |
Power & Control Pins
| 3V3 | Output from the on board voltage regulator. Alternatively, you can provide 3.3V directly to this pin if available. However, avoid supplying both VIN and 3V3 simultaneously. |
|---|---|
| GND | Ground Pins |
| EN | This is the reset pin. Connecting it to GND will reset the ESP32. By default, this pin is pulled high, and pressing the EN button pulls it LOW to trigger a reset. |
Opps
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