Objective: Read the temperature from DHT sensor and populate the HTML file in server, so that it can be seen anywhere from the world. This project uses HTTPclient configuration.
Hardware used:
- ESP8266MOD development board
- DHT11 sensor
- Raspberry Pi 3 (optional)
Software used:
- Arduino IDE to program ESP8266 - used nodemcu v1.0 board
- Arduino IDE is loaded in the Raspberry Pi 3
Hardware connection ESP8266 to DHT:
- Pin2 is used in software config of DHT, which is data pin of the sensor (note: which is D4 in the development board)
- Sensor positive is connected 3V3 (next pin to D4 in dev board)
- Sensor negative is connected to GND (next pin to 3V3 in dev board)
Software Configurations:
- HTTP basic client logic used in the Arduinoi IDE
- Included DHT sensor library
Server side configurations:
- created a sub domain iot
- If you are using raspberry pi as server ensure permissions is given to read/write from www use below command
sudo chown -R www-data: *
Raspberry Pi3 as Host:
- Loaded hostapd, dnsmasq and apache, php5 in raspberry pi,
- used internal wifi dongle and external wifi dongle created a tunnel to wlan1 sudo iptables -t nat -A POSTROUTING -o wlan1 -j MASQUERADE
- internal wifi can be used as AP and external dongle to connect to your wifi router
TODO:
- Connect to MySQL, enable login script php for security
- You can see the Door Open switch, which can connect the built in LED in esp8266 development board upon button down (onmousedown) and turn off during button up (onmouseup) events