ESP8266 Desk Clock with a 20x4 LCD I2C Display

Use an ESP8266 to drive an LCD to display time, weather, room climate and notes, all remotely commanded by Arduino IoT Cloud.

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Requirements

Note

You may edit the code to add, remove or modify features if you do not meet these requirements and you know what you are doing.

• Active Wi-Fi connection
• An LCD 20x4 screen with an I2C interface
• A DHT22 Temperature and Humidity Sensor (I do not recommend DHT11 sensors because of wide errors in their humidity readings).
• Arduino IoT Cloud connection with these variables below
• • String alert : RW - To send and alert or reminder to display on your screen
  • float arh : RO - Send relative humidity reading from DHT22 to cloud
  • float atemp : RO - Send temperature reading from DHT22 to cloud
  • bool tracfetch : RW - Turn Last.FM API calls for displaying "Now Playing" tracks
  • CloudDimmedLight bklt :RW - Turn ON/OFF or dim the LCD display backlight
• Separate connection to LCD backlight via PWM for backlight dimming

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Features

• Displays time fetched from the Internet using NTP
• Displays greetings based on time of day
• Ambient temperature and relative humidity display from a DHT22 sensor
• Displays reminders sent through Arduino IoT Cloud
• Displays the artist and track name you are listening to (fetched from Last.FM API)
• Full backlight control including dimming
• All control via Arduino Cloud IoT without the use of physical buttons
• Splits long texts into multiple pieces so it can be displayed in order, as the mapping in 20x4 displays is weird (see here). It can handle strings larger than the maximum character limit of the LCD and prints the remaining characters on a new (cleared) screen after a delay.

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Required Libraries

• ESP8266WiFi
• ArduinoIoTCloud
• LiquidCrystal_I2C (hd44780 is an alternative too)
• WiFiUdp
• NTPClient
• TimeLib
• JsonListener
• ESP8266HTTPClient
• DHTesp

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Todo (Hopes and Dreams)

• Add weather display including storm or snow alerts and display AQI using the OpenWeatherMap API.
• Fetch quotes, new words and other fun stuff from the internet to display on the LCD
• Add pictures, wiring diagrams to this readme
• Clean up code and improve documentation