IOT Project
Instructions to connect Wemos_D1_mini(esp8266)
When on the same Network
- Create a hotspot from your phone/desktop, rename your hotspot as “QMEL_LAB” and set the password of your hotspot qmel@123.
- Wait for few minutes when a device named “ESP-EAE289” get connected from the hotspot
- Go to setting of your hotspot and copy the connected device ip (192.168.xx.xx) and paste it in your browser
- Now you would be able to see the reading of the sensor.
When NOT on the same Network
- Go to the URL qmellabiitkgp.blogspot.com , click on the give link
- Open the link Example: 2baa-xxx-110-242-14.in.ngrok.io.( ! This link suppose to change. )
=======================================================================
Step wise guide to make wifi temperature sensor
- Components required:
Generic Wemos D1 Mini V2.2.0 Wifi Internet Development Board Based Esp8266 4Mb Flash Esp-12S Chip
- Any Power supply of 5V/2.4A (any smart phone charger USB MICRO B type)
- Connecting wire
- 100 K resistor
- RTC thermistors (Generic “10 Pcs Ntc Thermistor Temperature Sensor 10K Ohm Mf52-103 3435 1% “)
Connections:
Code
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
#include <ESP8266WiFi.h>
#include <math.h>
// http://arduino.esp8266.com/stable/package_esp8266com_index.json
unsigned int Rs = 150000;
double Vcc = 3.3;
// WiFi parameters
const char* ssid = "wifi name";
const char* password = "password";
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
Serial.println();
// Connect to WiFi network
WiFi.mode(WIFI_STA);
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");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {
delay(1000);
Serial.println(Thermister(AnalogRead()));
float temp = Thermister(AnalogRead());
WiFiClient client = server.available();
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 3"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE html>");
client.println("<html xmlns='http://www.w3.org/1999/xhtml'>");
client.println("<head>\n<meta charset='UTF-8'>");
client.println("<title>WifiTempSensor</title>");
client.println("<link href='https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css' rel='stylesheet'>");
client.println("</head>\n<body>");
client.println("<div class='container'>");
client.println("<div class='panel panel-default' margin:15px>");
client.println("<div class='panel-heading'>");
client.println("<H2>Wifi Temp Sensor</H2>");
client.println("<div class='panel-body' style='background-color: powdergreen'>");
client.println("<pre>");
client.print("Temperature (°C) : ");
client.println(temp, 2);
client.println("</pre>");
client.println("</div>");
client.println("</div>");
client.println("</div>");
client.print("</body>\n</html>");
}
int AnalogRead() {
int val = 0;
for(int i = 0; i < 20; i++) {
- Use Arduino IDE to upload the code in esp8266