ESP32 NodeMCU Development Board – WROOM-32 USB-C WiFi & Bluetooth

The ESP32 NodeMCU WROOM-32 development board is a powerful dual-core microcontroller with built-in WiFi and Bluetooth, now featuring a modern USB-C interface with CH340C USB-to-serial converter. It is ideal for IoT projects, Home Assistant integrations, smart sensors, automation systems and embedded development.

Compatible with Arduino IDE, ESP-IDF, MicroPython, ESPHome and PlatformIO.

Key Features & Specifications

ESP32 WROOM-32 dual-core CPU (up to 240 MHz)
Integrated WiFi 802.11 b/g/n + Bluetooth Classic & BLE
USB-C connector with CH340C USB-to-serial chip
Multiple GPIO with ADC, DAC, PWM, I²C, SPI and UART
3.3 V logic with onboard voltage regulation
Supports OTA updates and USB programming

Why Choose This ESP32 Board?

Reliable and widely supported ESP32 NodeMCU platform
USB-C connector for improved durability and convenience
Ideal balance of performance, connectivity and GPIO
Suitable for beginners, makers and professional developers
Huge ecosystem of libraries, tutorials and community support

Possible Uses & Project Ideas

Smart door / window monitoring
IoT sensor nodes and gateways
ESPHome & Home Assistant integrations
Wireless automation and alerts
MQTT monitoring and logging
Robotics and embedded control
Educational electronics & STEM projects

Beginner Wiring – Door Sensor (Reed Switch)

ESP32 NodeMCU        Magnetic Door Sensor
----------------------------------------
3V3        ─────────► (not used)
GND        ─────────► GND
GPIO13     ─────────► Signal

Notes:
• Configure GPIO13 as INPUT_PULLUP
• Door CLOSED = LOW (connected to GND)
• Door OPEN   = HIGH
• ESP32 uses 3.3 V logic only

Example Project (Supplemental) – Door Status Monitor with Telegram Alerts

This example demonstrates how the ESP32 can be used as a smart door or window monitor. When the door opens or closes, a message is instantly sent to Telegram over WiFi.

This is a popular real-world use case for home security, sheds, garages, server rooms and automation projects.

Example Projects – ESPHome & Arduino

Click to expand: ESPHome YAML (Door Sensor with Telegram Notifications)

esphome:
  name: esp32_door_monitor
  platform: ESP32
  board: esp32dev

wifi:
  ssid: "YOUR_SSID"
  password: "YOUR_PASSWORD"

logger:
api:
ota:

binary_sensor:
  - platform: gpio
    pin:
      number: 13
      mode: INPUT_PULLUP
      inverted: true
    name: "Door Sensor"
    device_class: door
    on_press:
      - http_request.post:
          url: "https://api.telegram.org/botYOUR_BOT_TOKEN/sendMessage"
          headers:
            Content-Type: application/json
          json:
            chat_id: "YOUR_CHAT_ID"
            text: "Door CLOSED 🔒"
    on_release:
      - http_request.post:
          url: "https://api.telegram.org/botYOUR_BOT_TOKEN/sendMessage"
          headers:
            Content-Type: application/json
          json:
            chat_id: "YOUR_CHAT_ID"
            text: "Door OPEN 🔓"

http_request:
  useragent: esphome/door-monitor
  timeout: 10s

Note: Replace WiFi credentials, Telegram bot token and chat ID. ESPHome allows easy Home Assistant integration and OTA updates.

Click to expand: Arduino Code (Door Alerts via Telegram)

#include <WiFi.h>
#include <HTTPClient.h>

const char* WIFI_SSID = "YOUR_WIFI_SSID";
const char* WIFI_PASS = "YOUR_WIFI_PASSWORD";

const char* BOT_TOKEN = "YOUR_BOT_TOKEN"; // Telegram bot token
const char* CHAT_ID   = "YOUR_CHAT_ID";   // Numeric chat ID or channel

const int DOOR_PIN = 13; // GPIO13
int lastState = HIGH;

void setup() {
  Serial.begin(115200);
  pinMode(DOOR_PIN, INPUT_PULLUP);

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  sendTelegram("ESP32 door monitor online");
}

void loop() {
  int state = digitalRead(DOOR_PIN);
  if (state != lastState) {
    lastState = state;
    if (state == LOW) {
      sendTelegram("Door CLOSED 🔒");
    } else {
      sendTelegram("Door OPEN 🔓");
    }
    delay(500);
  }
}

void sendTelegram(String message) {
  if (WiFi.status() != WL_CONNECTED) return;

  HTTPClient http;
  String url = "https://api.telegram.org/bot" + String(BOT_TOKEN) + "/sendMessage?chat_id=" + CHAT_ID + "&text=" + message;
  http.begin(url);
  http.GET();
  http.end();
}

Note: Arduino sketch provided as a simple reference implementation. No external libraries are required.

What’s Included

1 × ESP32 NodeMCU Development Board (WROOM-32, USB-C)

Shipping & Returns

Dispatch: Same or next working day (Mon–Fri)
Shipping: Fast UK delivery
Returns: 30-day returns accepted

Why Buy From Us?

UK-based seller with fast dispatch
Secure packaging for electronic components
Friendly technical support if you need help

Order now — a versatile ESP32 development board ideal for smart monitoring, IoT automation and wireless notification projects.