My first embedded project - an LCD display (with I2C module), buzzer and a button connected to a ESP8266 module via a breadboard. A simple websocket server with Express that serves a simple HTML page where the user can send a message that will be printed on the LCD display.
- When the ESP8266 module is connected to power, it will connect to a WiFi network. Connecting... and Connected text will be printed on the display.
Note:
ssidandpasswordneed to be hardcoded in the code.
- Via the server (currently hosted at ESP8266-Pager) the user can send a message.
Note: Due to the 16x2 size of the display, a 32 character limit is enforced on the input.
- On sending a message a loading spinner will be rendered on the send button. After receiving and displaying the message, the ESP8266 will send back a response to the server, informing the server that the button should be usable again.
- A notification sound will be played through the buzzer on a new message.
- The display will be turned off after 10 seconds. A new message or manually pressing the button on the breadboard will turn the display on for 10 seconds.
- If a message is not received by the ESP8266 in 5 seconds (probably it's offline), a timeout will occur and an error message will be displayed
I have used the Arduino IDE to write the C++ code for the ESP8266 module. Required Arduino libraries:
- ESP Async TCP 2.0.0 by ESP32Async
- WebSockets 2.6.1 by Markus Sattler
- LiquidCrystal I2C 1.1.2 by Frank de Brabander