Node MCU ESP8266 V3 (LOLIN CH340 chip) (pack of 25)

Node MCU ESP8266 V3 (LOLIN CH340 chip) Documentation

Overview

The Node MCU ESP8266 V3 is a popular microcontroller board based on the ESP8266 system-on-chip (SoC) and LOlin CH340 chip. It is a versatile and affordable IoT development board that supports Wi-Fi connectivity, making it suitable for a wide range of IoT projects.

Hardware Specifications

Microcontroller: ESP8266
 Wi-Fi: 802.11 b/g/n
 GPIO: 13 (including 1x UART, 1x I2C, 1x I2S)
 Flash Memory: 4MB
 SRAM: 96KB
 Operating Voltage: 3.3V
 Input Voltage: 5-12V
 Dimensions: 49 x 24.5 mm

Software Support

The Node MCU ESP8266 V3 is compatible with a variety of programming languages, including C, C++, Lua, and MicroPython.

Code Examples

### Example 1: Wi-Fi Connect and HTTP Client

This example demonstrates how to connect the Node MCU ESP8266 V3 to a Wi-Fi network and make an HTTP request to a web server.
```c
#include <WiFi.h>
#include <HTTPClient.h>

const char ssid = "your_wifi_ssid";
const char password = "your_wifi_password";
const char serverUrl = "http://example.com";

WiFiClient wifiClient;
HTTPClient http;

void setup() {
  Serial.begin(115200);

// Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

Serial.println("Connected to WiFi");
  Serial.println("Initializing HTTP client...");
}

void loop() {
  http.begin(wifiClient, serverUrl);
  int httpCode = http.GET();

if (httpCode > 0) {
    String response = http.getString();
    Serial.println(response);
  } else {
    Serial.println("Error sending request");
  }

http.end();
  delay(5000);
}
```
### Example 2: Blinking LED using MicroPython

This example demonstrates how to use MicroPython to blink an LED connected to GPIO 2 on the Node MCU ESP8266 V3.
```python
import machine
import time

# Set up GPIO 2 as an output
led = machine.Pin(2, machine.Pin.OUT)

while True:
    # Turn on the LED
    led.value(1)
    time.sleep(0.5)

# Turn off the LED
    led.value(0)
    time.sleep(0.5)
```
### Example 3: Reading Temperature and Humidity using DHT11 Sensor

This example demonstrates how to use the Node MCU ESP8266 V3 to read temperature and humidity data from a DHT11 sensor.
```c
#include <DHT.h>

#define DHT_PIN 2
#define DHT_TYPE DHT11

DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");

Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

delay(2000);
}
```
These examples demonstrate the versatility of the Node MCU ESP8266 V3 and its potential for IoT development. With its Wi-Fi capabilities, GPIO pins, and support for various programming languages, this board is an ideal choice for a wide range of projects.