Molemi IoT
  • Space farming using food computers for sustainable farming
  • Introduction to Arduino
    • Introduction to Electronics
    • The Breadboard
  • Controlling LEDs with an Arduino
    • The Code
    • Adding a button to control the LEDs
      • The Code
  • Introducing Sensors
    • The CO2 and air quality sensor
    • The Code
      • Explaining the Code
    • Light Intensity Sensor
  • Introducing the NodeMCU
    • Getting Started
      • A simple test for ESP8266
        • The Code
    • A light bulb switch using NodeMCU and the Blynk app
      • Setup Blynk on your Smartphone
      • The Code
    • Controlling a Centurion gate Motor with NodeMCU a 2-channel relay
      • Installing Blynk in Arduino IDE
    • Read and display the water flow sensor on Blynk
      • Setting up Blynk
      • The Code
        • Explaining the code
    • Read and Display temperature sensor readings with NodeMCU.
      • Installing libraries for DS18B20 temperature sensor.
      • Displaying the sensor readings on the serial port
        • Getting temperature readings from different DS18B20 sensors.
          • The Code
            • Display sensor readings on a web server
              • Build the web server
                • Designing and building the web page
                • The Code
    • Display the DHT11 sensor reading on a web server using NodeMCU.
      • Monitoring Room Temp & Humidity using Blynk
      • Installing DHT library on the ESP8266
        • Installing the Asynchronous Web Server library
          • The Code
          • Designing and building the web page
  • Data Science for Farming
    • Getting Started with Colaboratory
    • Introduction to Python for DS using Colab
  • Machine Learning for Farming
  • Molemi Personal Food Computer
    • Bill of Materials
  • Setting up WaziGate on a Raspberry Pi
  • Setting up DHT11 on Raspberry Pi
  • Using Telegram To Control Outputs
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  1. Introducing the NodeMCU
  2. Getting Started
  3. A simple test for ESP8266

The Code

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Last updated 5 years ago

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The following code can be copied and pasted in your Arduino IDE:

int pin = 2;

void setup() {
  // initialize GPIO 2 as an output.
  pinMode(pin, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(pin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(pin, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}

Once you are done you can upload the code to the NodeMCU. When the code runs you should be able to see the LED blinking. It will turn on for 1 second and turn off for 1 second.