Adjustable delay

Using Arduino Programming Questions
1

Hello, I'm new to coding and wanted to make a web page through an esp32 that can remotely change the delay through my phone. For example, I have a simple program that has a delay for 2000ms, is it possible to remotely change the delay anywhere from 2000ms to 5000ms through the webpage?
digitalWrite(relay_pin, HIGH);
delay(2000);

2 
unsigned long x;

//set x with phone..

digitalWrite(relay_pin, HIGH);
delay(x);

Like that.

-jim lee

3

also google for "esp32 web server"
You use the web browser on your smart phone to talk to the web server.

4

How can I set x with my phone? Sorry, I'm new to this. Here's what I've been working on.

#include <WiFi.h>

WiFiServer server(80);
WiFiClient client;

const char* ssid = "esp32"; // Your Wifi network name here
const char* password = "12345678"; // Password

int relay_pin = 15;

unsigned long x;

void setup()
{

Serial.begin (115200);
pinMode (relay_pin, OUTPUT);
digitalWrite(relay_pin, LOW);

Serial.print ("Connecting to ");
Serial.print(ssid);

//CONNECT TO WIFI
WiFi.softAP(ssid, password);

Serial.println( "" );
Serial.println( "WiFi AP is now running" );
Serial.println( "IP address: " );
Serial.println( WiFi.softAPIP() );

server.begin(); // Starting the server
}

void loop()
{
WiFiClient client = server.available(); //Checking if any client request is available or not
if (client)
{
boolean currentLineIsBlank = true;
String buffer = "";
while (client.connected())
{
if (client.available()) // if there is some client data available
{
char c = client.read();
buffer+=c; // read a byte
if (c == '\n' && currentLineIsBlank) // check for newline character,
{
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.print("Relayesp32");
client.print("

Relay

");
client.print("

Relay Control

");
client.print("<a href="/?relayon"">ON");
client.print("<a href="/?pms"">Increase"); //pms== positive ms
client.print("");

      break;        // break out of the while loop:
    }
    if (c == '\n') { 
      currentLineIsBlank = true;
      buffer="";       
    } 
    else 
      if (c == '\r') {     
      if(buffer.indexOf("GET /?relayon")>=0)
        digitalWrite(relay_pin, HIGH);
        delay(x);
        digitalWrite(relay_pin, LOW);

      if(buffer.indexOf("GET /?pms")>=0)
        //controll delay here
    }
      
    else {
      currentLineIsBlank = false;
    }  
  }
}
client.stop();

}
}

5

Break it down into separate parts.
There is a standard web server which serves a page with a parameter the user can adjust. You should be able to find examples, one of which you seem to have already found.
There is a state problem where you issue a command to switch a relay on and then, after a preset time, defined by your parameter, it switches itself off.

Format the code in the IDE and use code tags when posting code on this forum.

6

Repeat that last bit to yourself every day.

1 Like
7

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.