33  Assignment 3

33.1 Goal

Build an ESP32 clock & weather station that:

• shows time and temperatures on an OLED
• measures indoor temperature (SHT31) and outdoor temperature (DS18B20)
• uploads data to ThingSpeak

33.2 Hardware (minimum)

• ESP32
• SHT31 temperature & humidity sensor (indoor)
• DS18B20 / DS18x20 temperature sensor (outdoor)
• I2C OLED

33.3 What your project must do

1. Display on the OLED
   • current time (HH:MM, with seconds optional)
     
   • indoor temperature (from SHT31)
     
   • outdoor temperature (from DS18B20)
     
   • temperature difference (for example: ΔT = Tout − Tin)
2. Upload to ThingSpeak
   • use your own ThingSpeak channel
     
   • send at least:
     • field 1: indoor temperature
       
     • field 2: outdoor temperature
       
     • field 3: temperature difference
3. Use real sensor readings
   • no fake / random values
     
   • both sensors must be wired and working

33.4 Bonus ideas (optional)

• show a weather forecast (for example, today’s max temperature from an online API)
  
• add controls (buttons or web server) to change display mode or update rate
  
• add alarms if ΔT is larger than some threshold
• recommendations - open window or turn on/off AC
• log extra variables to ThingSpeak (humidity, min/max, etc.)
• be creative

33.5 What to submit

• link to your ThingSpeak channel
  
• short video showing the project
• your code (.ino or project folder)
• schematics in .pdf format