Smart thermometer (i know you see this name on every project) is a arduino project that measures temperature and humidity of enviroment.
In this project we used nodemcu esp8286 board and HDT11 sensor.
When device turn on, user will connect to device access point and see temerature and humidity. also can set a SSID and password of near wifi to let device to connect to it and use internet to share data in website so user can access data anywhere in our website.
Anyway, device will share data in a web server created in its access point in 192.168.4.1 address. So you can check temperature and humidity in 2 ways.
For back-end of this project to store data, we are using PHP and MySQL database. device use api to update data, create new account or login to created account to send data in database.
User can create account from website and login to it from device, or do it from deivice.
Current hosted website url is http://broifeelhot.iapp.ir.
For messure temperature and humidity, we used HDT11 sensor.
Working with this sensor is simple when you use Adafruit_Sensor library. With this library you can interface HDT11 sensor so easy.
EEPROM library used to write wifi and account information in device EEPROM.
For creating web server on access point ESP8266WiFi, ESPAsyncTCP and ESPAsyncWebSrv really helped us and make every thing easy.
A web server will create on device access point on 192.168.4.1 address so user can change setting of davice or see data.
For sending http request to api ESP8266HTTPClient library is really helpfull that make works fast and easy. requests and responses sending in Json.
Requests sending with post method.
For handling responses and errors, api response with http status codes so we can handle states in device side easy.