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@glyons
Last active August 10, 2023 05:59
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ESP 8266 Data Logger for Temperature and Humidity using DHT 11
//https://iotprojectsideas.com/esp8266-data-logger-upload-data-on-webserver/
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include "DHT.h"
#ifndef STASSID
#define STASSID "Wifi_Name"
#define STAPSK "Wifi_Password"
#endif
const char *ssid = STASSID;
const char *password = STAPSK;
#define LED 2 //On board LED
#define DHTTYPE DHT11 // DHT 11
uint8_t DHTPin = 5;
DHT dht(DHTPin, DHTTYPE);
float humidity, temperature;
ESP8266WebServer server(80);
const char MAIN_page[] PROGMEM = R"=====(
<!doctype html>
<html>
<head>
<title>Data Logger</title>
<h1 style="text-align:center; color:red;">Darkroom Timer</h1>
<h3 style="text-align:center;">F-STOP Data Logger</h3>
<style>
canvas{
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
/* Data Table Styling*/
#dataTable {
font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
border-collapse: collapse;
width: 100%;
text-align: center;
}
#dataTable td, #dataTable th {
border: 1px solid #ddd;
padding: 8px;
}
#dataTable tr:nth-child(even){background-color: #f2f2f2;}
#dataTable tr:hover {background-color: #ddd;}
#dataTable th {
padding-top: 12px;
padding-bottom: 12px;
text-align: center;
background-color: #050505;
color: white;
}
</style>
</head>
<body>
<div>
<table id="dataTable">
<tr>
<th>Session</th>
<th>No.</th>
<th>Type</th>
<th>Exposure</th>
<th>Time</th>
<th>Temperaure (°C)</th>
<th>Humidity (%)</th>
</tr>
</table>
</div>
<br>
<br>
<script>
var Tvalues = [];
var Hvalues = [];
var timeStamp = [];
setInterval(function() {
// Call a function repetatively with 5 Second interval
getData();
}, 5000); //5000mSeconds update rate TODO change that the GO Button to updates the data.
function getData() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
//Push the data in array
var time = new Date().toLocaleTimeString();
var txt = this.responseText;
var obj = JSON.parse(txt);
Tvalues.push(obj.Temperature);
Hvalues.push(obj.Humidity);
timeStamp.push(time);
//Update Data Table
var table = document.getElementById("dataTable");
var row = table.insertRow(1); //Add after headings
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
var cell5 = row.insertCell(4);
var cell6 = row.insertCell(5);
cell1.innerHTML = '#120'; //example session
cell2.innerHTML = '#1';//example number
cell3.innerHTML = 'Strip Test/Exposure'; //TODO
cell4.innerHTML = '11.2s';//TODO exposure
cell1.innerHTML = time;
cell2.innerHTML = obj.Temperature;
cell3.innerHTML = obj.Humidity;
}
};
xhttp.open("GET", "readData", true); //Handle readData server on ESP8266
xhttp.send();
}
</script>
</body>
</html>
)=====";
void handleRoot()
{
String s = MAIN_page; //Read HTML contents
server.send(200, "text/html", s); //Send web page
}
void readData()
{
String data = "{\"Temperature\":\""+ String(temperature) +"\", \"Humidity\":\""+ String(humidity) +"\"}";
digitalWrite(LED,!digitalRead(LED));
server.send(200, "text/plane", data);
delay(2000);
temperature = dht.readTemperature();
humidity = dht.readHumidity();
Serial.print(humidity, 1);
Serial.print(temperature, 1);
}
void setup(void) {
Serial.begin(115200);
pinMode(DHTPin, INPUT);
dht.begin();
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}
server.on("/", handleRoot);
server.on("/readData", readData);
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
MDNS.update();
}
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