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fe6bef0 Sep 9, 2017
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/********************************************************************************
* Sending data to a local Page
* => Temp/Hum from a DHT22 Sensor
* => Generic data from a analog input (potenciometer)
*
* Receiving commands from a local page
* ==> Turning ON/OFF a LED
*
* Based on original SimpleWiFiServer created for on Arduino 25 Nov 2012 by Tom Igoe
* and ported for sparkfun esp32 on 31.01.2017 by Jan Hendrik Berlin
*
* MJRoBot.org 9Sept17
********************************************************************************/
/* WiFi parameters and credentials */
#include <WiFi.h>
const char* ssid = "YOUR SSID";
const char* password = "YOUR PASSWORD";
WiFiServer server(80);
/* DHT Temperature and Humidity Sensor */
#include "DHT.h"
#define DHTPIN 23
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
float localHum = 0;
float localTemp = 0;
/* LED */
#define LED_PIN 2
//Analog Input
#define ANALOG_PIN_0 36
int analog_value = 0;
void setup()
{
Serial.begin(115200);
pinMode(LED_PIN, OUTPUT);
delay(10);
connectWiFi();
dht.begin();
}
int value = 0;
void loop()
{
analog_value = analogRead(ANALOG_PIN_0);
getDHT();
WiFiLocalWebPageCtrl();
}
/***************************************************
* Get indoor Temp/Hum data
****************************************************/
void getDHT()
{
float tempIni = localTemp;
float humIni = localHum;
localTemp = dht.readTemperature();
localHum = dht.readHumidity();
if (isnan(localHum) || isnan(localTemp)) // Check if any reads failed and exit early (to try again).
{
localTemp = tempIni;
localHum = humIni;
return;
}
}
/***************************************************
* Send and receive data from Local Page
****************************************************/
void WiFiLocalWebPageCtrl(void)
{
WiFiClient client = server.available(); // listen for incoming clients
//client = server.available();
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:
//WiFiLocalWebPageCtrl();
client.print("Temperature now is: ");
client.print(localTemp);
client.print(" oC<br>");
client.print("Humidity now is: ");
client.print(localHum);
client.print(" % <br>");
client.print("<br>");
client.print("Analog Data: ");
client.print(analog_value);
client.print("<br>");
client.print("<br>");
client.print("Click <a href=\"/H\">here</a> to turn the LED on.<br>");
client.print("Click <a href=\"/L\">here</a> to turn the LED off.<br>");
// 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 /H" or "GET /L":
if (currentLine.endsWith("GET /H")) {
digitalWrite(LED_PIN, HIGH); // GET /H turns the LED on
}
if (currentLine.endsWith("GET /L")) {
digitalWrite(LED_PIN, LOW); // GET /L turns the LED off
}
}
}
// close the connection:
client.stop();
Serial.println("Client Disconnected.");
}
}
/***************************************************
* Connecting to a WiFi network
****************************************************/
void connectWiFi(void)
{
Serial.println();
Serial.println();
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();
}