Espressif Systems ESP8266 Beginner's Manual page 48

how it works, you can find the files in the ZIP archive.
Using the example
Set the SPIFFS size to 64KB or larger if you plan to use it for prolonged periods of time. (You could also increase the logging interval on
line 80 to save space.)
Enter your Wi-Fi credentials on lines 138-140, and hit upload. Then upload the webpages and scripts to SPIFFS using Tools > ESP8266
Sketch Data Upload.
Make sure you have the temperature sensor connected, as described at the top of this page. Open a terminal to see if it works. You
should see something like this:
Connecting
..........
Connected to SSID
IP address: 192.168.1.2
OTA ready
SPIFFS started. Contents:
FS File: /favicon-144x144.png, size: 2.81KB
FS File: /temperatureGraph.js.gz, size: 1.17KB
FS File: /temp.csv, size: 42.50KB
FS File: /success.html.gz, size: 456B
FS File: /edit.html.gz, size: 700B
FS File: /main.css.gz, size: 349B
FS File: /index.html.gz, size: 795B
FS File: /manifest.json, size: 169B
FS File: /favicon.ico.gz, size: 1.91KB
mDNS responder started: http://esp8266.local
HTTP server started.
Starting UDP
Local port: 123
Time server IP: 216.229.0.179
Sending NTP request
NTP response: 1488666586
Temperature requested
Appending temperature to file: 1488666627,20.00
Temperature requested
Appending temperature to file: 1488666687,19.94
Temperature requested
...
Let it run for a couple of minutes, to gather some temperature data. Then open a web browser, and go to http://esp8266.local/.
You should get a graph showing the temperature curve. You can use the arrow buttons to travel through time, and the + and - buttons
to zoom in or out. The reset button resets the zoom, and jumps back to the present. Refresh requests the latest temperature data.
If you want, you can still go to http://esp8266.local/edit.html to upload new files.
The web interface should look like this:
It works on Windows, Linux and Android, but iOS seems to have some problems rendering the graph (in both Chrome and Safari).