ARUNO_NodeMCU_MIT-APP_LEDon

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LED Control with Android App via Wi-Fi

This project demonstrates controlling an LED using an Android app via Wi-Fi, connecting a NodeMCU and Arduino Uno, and sending data back to the app. Watch the video below for a detailed explanation:

• References:
  1. How to Build a Custom Android App for Your Arduino Project Using MIT App Inventor
  2. MIT App Inventor
  3. SoftwareSerial Communication Between Arduino Uno and NodeMCU
  4. Remote-Controlled Car Project via Internet with iNut Sensor
  5. MIT App Inventor 2 - NodeMCU Wi-Fi Car Control App
  6. NodeMCU Server | Control via Web Browser | RoboShala Hindi

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Table of Contents

1. Ledon_Uno
   1.1 Overview
   1.2 How It Works
2. Ledonwifi
   2.1 Overview
   2.2 How It Works

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1. Ledon_Uno

1.1 Overview

The Ledon_Uno Arduino sketch integrates an ultrasonic sensor (HC-SR04) and an LED controlled by an Arduino Uno. It communicates with a NodeMCU (ESP8266) via SoftwareSerial. The ultrasonic sensor measures distance, and the LED is controlled based on commands received from the Ledonwifi sketch.

1.2 How It Works

1. Setup:

   • The HC-SR04 ultrasonic sensor is connected to pins 8 (trig) and 7 (echo).
   • An LED is connected to pin 12.
   • SoftwareSerial communication is established between Arduino Uno and NodeMCU on pins 3 (RX) and 2 (TX).
   • OpenAI API credentials are configured (if applicable).

2. Distance Measurement:

   • The distance() function uses the HC-SR04 sensor to measure the distance in centimeters.

3. Communication with NodeMCU:

   • The Arduino Uno sends distance data to the NodeMCU via SoftwareSerial.
   • The NodeMCU processes this data and sends LED control commands back.

4. Data Transmission:

   • The Arduino Uno continuously measures and transmits distance data to the NodeMCU.
   • The NodeMCU toggles the LED on or off based on commands from Ledonwifi.

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2. Ledonwifi

2.1 Overview

The Ledonwifi sketch runs on a NodeMCU (ESP8266) and acts as a web server. It receives HTTP requests to control the LED on Ledon_Uno and retrieves distance information from the Arduino Uno.

2.2 How It Works

1. Setup:

   • The NodeMCU connects to a Wi-Fi network.
   • A web server is initialized on the NodeMCU.

2. LED Control:

   • HTTP requests like "LEDon" and "LEDoff" trigger the LEDon() and LEDoff() functions.
   • These commands are sent to Ledon_Uno to control the LED.

3. Distance Information:

   • The "distance" command retrieves distance data from Ledon_Uno.
   • The data is returned to the client (e.g., a browser or app) making the HTTP request.

4. HTTP Server Handling:

   • The server listens for client connections and responds to incoming requests.

Note: Ensure Wi-Fi credentials in Ledonwifi match your network settings. Keep the OpenAI API key in Ledon_Uno secure and avoid sharing it publicly.