ESP8266 WeMos D1 MINI ESP-12E IoT WiFi Wireless Board Arduino IDE Compatible - Image 1
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ESP8266 WeMos D1 MINI ESP-12E IoT WiFi Wireless Board Arduino IDE Compatible - Image 6
ESP8266 WeMos D1 MINI ESP-12E IoT WiFi Wireless Board Arduino IDE Compatible - Image 7

ESP8266 WeMos D1 MINI ESP-12E IoT WiFi Wireless Board Arduino IDE Compatible

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Description

Introducing the ESP8266 WeMos D1 Mini ESP-12E IoT WiFi Wireless Board – Your Ultimate Development Companion

Unlock the power of seamless connectivity with the WeMos D1 mini, an ultra-compact 802.11 (Wifi) microcontroller development board. This ingenious board elevates the renowned ESP8266 wireless microcontroller, empowering it to function as a full-fledged development marvel. Experience programming ease akin to any Arduino-based microcontroller, courtesy of the built-in micro USB interface. Seamlessly program the D1 mini directly from the Arduino IDE, requiring no supplementary hardware.

Key Features:

  • Microcontroller: ESP8266EX
  • Built-in USB ↔ Serial Converter: CH340G
  • Digital I/O Pins: 11 (excluding D0)
  • Analog Input Pins: 1
  • Flash Memory: 4MB
  • Compact Dimensions (excluding pins):
    • Length: 34.2 mm
    • Width: 25.6 mm
    • Height: 7 mm
  • Inclusive Weight (including pins): 8.26 g
  • Versatile Functionality: All I/O pins offer interrupt, PWM, I2C, and one-wire capabilities, except for D0

Package Contents:

  • 1× D1 Mini NodeMcu Development Board
  • 2× Long Female Pins
  • 2× Short Female Pins
  • 2× Normal Pins

Please be aware that the manufacturer of the ESP12 chip may differ from the image.

Embrace a new era of development potential with the ESP8266 WeMos D1 Mini ESP-12E. Seamlessly integrate wireless capabilities into your projects and explore the endless horizons of IoT innovation. With its miniature footprint and Arduino IDE compatibility, this board redefines what’s possible. Unleash the power of connectivity today!

📌 Code Examples & Usage – ESP8266 Wemos D1 Mini (ESP-12E)

📋 Overview

The Wemos D1 Mini is a compact ESP8266-based WiFi development board that is fully compatible with the Arduino IDE.

Key features:

  • Microcontroller: ESP8266 (ESP-12E)

  • WiFi: 2.4 GHz 802.11 b/g/n

  • Logic level: 3.3 V

  • USB interface: Onboard USB-to-Serial

  • Programming: Arduino IDE

  • Small form factor with shield support

Ideal for:

  • IoT projects

  • WiFi sensors

  • Smart switches & relays

  • Home automation

  • MQTT & HTTP projects

⚠ Important Electrical Notes

  • Logic voltage: 3.3 V ONLY

  • GPIO pins are not 5 V tolerant

  • Board is powered via USB (5 V) or 5 V pin

  • Onboard regulator provides 3.3 V for ESP8266

✔ Safe and beginner-friendly (no external programmer required)

🔌 Pin Overview (Commonly Used)

Pin ESP8266 GPIO
D0 GPIO16
D1 GPIO5 (SCL)
D2 GPIO4 (SDA)
D3 GPIO0
D4 GPIO2 (LED)
D5 GPIO14
D6 GPIO12
D7 GPIO13
D8 GPIO15
A0 ADC (0–3.3 V max)

📌 Onboard LED is usually on D4 (GPIO2) and is active LOW.

🛠 Arduino IDE Setup

1️⃣ Add ESP8266 Board Support

  1. Open Arduino IDE

  2. Go to File → Preferences

  3. Add this URL to Additional Boards Manager URLs:

http://arduino.esp8266.com/stable/package_esp8266com_index.json

  1. Open Tools → Board → Boards Manager

  2. Install ESP8266 by ESP8266 Community

2️⃣ Board Settings

Select:

  • Board: LOLIN (Wemos) D1 mini

  • Flash Size: 4M (1M SPIFFS)

  • CPU Frequency: 80 MHz

  • Upload Speed: 115200

  • Port: (your COM port)

🧪 1️⃣ Basic Blink Test (Onboard LED)

void setup() {
pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
digitalWrite(LED_BUILTIN, LOW); // LED ON
delay(500);
digitalWrite(LED_BUILTIN, HIGH); // LED OFF
delay(500);
}

✔ Confirms board, USB, and IDE setup are working
✔ LED is active LOW

🌐 2️⃣ WiFi Connection Example

#include <ESP8266WiFi.h>

const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";

void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);

Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

Serial.println("\nConnected!");
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
}

void loop() {
}

🌍 3️⃣ Simple Web Server Example

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

ESP8266WebServer server(80);

void handleRoot() {
server.send(200, "text/plain", "Hello from AuscomTech D1 Mini");
}

void setup() {
WiFi.begin("YOUR_WIFI", "YOUR_PASS");
while (WiFi.status() != WL_CONNECTED) delay(500);

server.on("/", handleRoot);
server.begin();
}

void loop() {
server.handleClient();
}

✔ Type the ESP8266 IP address into your browser
✔ Great first IoT demo

📡 4️⃣ Read Analog Voltage (A0)

void setup() {
Serial.begin(9600);
}

void loop() {
int value = analogRead(A0);
float voltage = value * (3.3 / 1023.0);

Serial.print("ADC: ");
Serial.print(value);
Serial.print(" Voltage: ");
Serial.println(voltage);

delay(500);
}

⚠ A0 max input is 3.3 V (some boards include a divider — check before using)

🧠 Tips & Best Practices

✔ Avoid using GPIO0, GPIO2, GPIO15 incorrectly at boot
✔ Use external power for relays, motors, and servos
✔ Use pull-ups on I²C (D1/D2 already have them)
✔ Keep WiFi antennas clear of metal enclosures

Additional information

Weight 40 g
Dimensions 260 × 160 × 20 mm

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