How to print the value of a number in a http server (Arduino ESP32)
Posted: Tue Jul 25, 2017 6:43 pm
This little server give to us a ip, wich one we will be using as a URL for example: (http://10.0.0.1), once we are there we can play with LED's and stuff, So, the question here is : this use a GPIO to capture a ADC value, this value is on the Serial monitor but it isn't in the page!, How can i put that value in the page?
Here is the code:
Here is the code:
Code: Select all
/**/
/*Using the ESP-WROOM-32*/
/**/
#include <WiFi.h>
const char* ssid = "CLAROQNK37";
const char* password = "9j98g4NuEaq496Yk";
WiFiServer server(80);
const int analogPin = 32; // Analog input pin , ours is connected to YL-83
int sensorValue = 0;
//4095 => 3.3
// ADC * 3.3 / 4095 = v
void setup()
{
Serial.begin(115200); // Baud Rate
pinMode(5, OUTPUT); // Green LED
pinMode(4, OUTPUT); // Yellow LED
pinMode(12,OUTPUT); // Buzzer
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(100);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
int value = 0;
void loop()
{
WiFiClient client = server.available(); // listen for incoming clients
if (client) // if you get a client,
{
Serial.println("New Client."); // print a message out the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) // loop while the client's connected
{
if (client.available()) // if there's bytes to read from the client,
{
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
//
if (c == '\n') // if the byte is a newline character
{
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
//
if (currentLine.length() == 0)
{
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// the content of the HTTP response follows the header:
client.print("<head><title>Test Led http protocol</title></head>");
client.print("<center><h1><b>ESP32 Web Control!!</b></h1></center>");
client.print("<center><p><b>GREEN LED</b><a href=\"ON1\"><button>ON</button></a> <a href=\"OFF1\"><button>OFF</button></a></p></center>");
client.print("<center><p><b>Yellow LED</b><a href=\"ON2\"><button>ON</button></a> <a href=\"OFF2\"><button>OFF</button></a></p></center>");
client.print("<center><h1>Effects!!!!</h1></center>");
client.print("<center><p>Blink<b>(2 Secs Aprox)</b><a href=\"BLINK\"><button>ON</button></center>");
client.print("<center><p>Wave<b>(2 Secs Aprox)</b><a href=\"WAVE\"><button>ON</button></center>");
client.print("<center><h1>Buzzer!!1</h1></center>");
client.print("<center><p>lil bip!<b>(1 Sec)</b><a href=\"BIP\"><button>ON</button></center>");
client.print("<p>Value</p>");
// The HTTP response ends with another blank line:
client.println();
// break out of the while loop:
break;
}
//
else
{ // if you got a newline, then clear currentLine:
currentLine = "";
}
//
}
//
else if (c != '\r') // if you got anything else but a carriage return character,
{
currentLine += c; // add it to the end of the currentLine
}
//
// Check to see if the client request was "GET /ON" or "GET /OFF":
//
if (currentLine.endsWith("GET /ON1"))
{
digitalWrite(5, HIGH);// GET /ON turns the LED on
}
//
if (currentLine.endsWith("GET /OFF1"))
{
digitalWrite(5, LOW);// GET /OFF turns the LED off
}
if (currentLine.endsWith("GET /ON2"))
{
digitalWrite(4, HIGH);// GET /ON turns the LED on
}
//
if (currentLine.endsWith("GET /OFF2"))
{
digitalWrite(4, LOW);// GET /OFF turns the LED off
}
//
if (currentLine.endsWith("GET /BLINK"))
{
digitalWrite(5, HIGH);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(5, LOW);
digitalWrite(4, LOW);
delay(500);
digitalWrite(5, HIGH);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(5, LOW);
digitalWrite(4, LOW);
delay(500);
}
if (currentLine.endsWith("GET /WAVE"))
{
digitalWrite(5, HIGH);
digitalWrite(4, LOW);
delay(500);
digitalWrite(5, LOW);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(5, HIGH);
digitalWrite(4, LOW);
delay(500);
digitalWrite(5, LOW);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(4, LOW);
}
//
if (currentLine.endsWith("GET /BIP"))
{
digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
delay(10);
digitalWrite(12, HIGH);
delay(500);
digitalWrite(12, LOW);
}
}
}
// close the connection:
client.stop();
Serial.println("Client Disconnected.");
}
/*
-SensorValue stuff
*/
sensorValue = analogRead(analogPin);
double vol = sensorValue * 3.3 / 4095;
Serial.println(sensorValue);
Serial.println(vol);
client.print(sensorValue);
client.print(vol);
delay(500);
client.print(vol,DEC);
if (vol =< 1.00) //if the voltage is under 1.00 This is for a buzzer
{
digitalWrite(12, HIGH);
delay(600);
digitalWrite(12, LOW);
}
if (vol => 3.00) //if the voltage is over 3.00 This is for a buzzer
{
digitalWrite(12, HIGH);
delay(100);
digitalWrite(12, LOW);
}
/*
-SensorValue stuff
*/
}