DIY Ultrasonic Fun Gadget for Computer / Computer

ULTRASONIC SENSOR DIY PROJECT

What is this device :

This one of my favorite fun device, This device helps to lock/minimize our laptop/computer when someone walks near to you.

Requirements :

1.Node MCU Offer [BuyNow]

2.Node MCU Program [Linked with this post]

3.AdhilControl Panel [DownoadNow]

How its works:

This device made using NODE MCU and ULTRASONIC SENSOR. Sensor capture distance and store the distance with node mcu. If the distance value changed it will trigger node MCU and node MCU trigger computer software.

NODE MCU and COMPUTER communicated with mobile hotspot.

How to Setup :

1.First connect Node MCU with laptop using USB cable. open arduino software and upload bottom code.

const int trigPin = 2;  //D4
const int echoPin = 0;  //D3
#include <ESP8266WiFi.h>

int trigger=0;

long duration;
int distance;
int startdistance;
int licedist;
// Replace with your network credentials
const char* ssid     = "hotspotname";
const char* password = "hotspotpassword";

// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;

unsigned long previousMillis = 0;       
const long interval = 5000;

void setup() {
 pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
 pinMode(echoPin, INPUT); // Sets the echoPin as an Input
 pinMode(LED_BUILTIN, OUTPUT);

Serial.begin(115200);
  ultra();
  delay(5000);
  startdistance=ultra();

// Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void loop(){
  ultra();
  
  WiFiClient client = server.available();   // Listen for incoming clients

if (client) 
  {

// Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
           // client.println("<meta http-equiv=\"refresh\" content=\"1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
            client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #77878A;}</style></head>");
            
            // Web Page Heading
            client.println("<body><h1>ESP8266 Web Server</h1>");
            if (trigger==0) 
            {
                 client.println("<label id=\"trigswi\" value=\"OFF\">OFF</label>");
            } else 
            {
                 client.println("<label id=\"trigswi\" value=\"ON\">ON</label>");
            } 
            client.println("</body></html>");            
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            
     if(trigger==1) //Alrady trigger wating refresh to next trigger
  {
      unsigned long currentMillis = millis();
      if (currentMillis - previousMillis >= interval)
      {    
        previousMillis = currentMillis;
        trigger=0;
         Serial.print("Triger Restarted");
      }

// delay(5000);
    //trigger=0;
   
  }

}//client

}

int ultra()
{
  digitalWrite(trigPin, LOW);
delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);

// Calculating the distance
distance= duration*0.034/2;
// Prints the distance on the Serial Monitor

Serial.print("Distance: ");
Serial.println(distance);
                               
 if(distance<(startdistance-10))
  {
    trigger=1;
     Serial.print("Triger Setted");
  }

delay(100);

return distance;

}

2.Upload the Code to node mcu.

3.Now its ready to power up. use mobile OTG or powerbank.