Temperature and Humidity Monitoring System

Temperature and Humidity Monitoring System using:

• ESP32 as MCU.
• I²C LCD for displaying temperature and humidity information
• AJ-SR04M utrasonic sensor for water level monitoring.
• SIM800L EVB GMS Module for SMS functionality.
• 5v relay to turn on 12v pump.
• 2 DHT11 modules to gather temperature and humidity data for both indoor and roof.
• SD Card data logging.

Functionality

1. Sends SMS alerts when outdoor temperature reaches 32°C or water level is below 20%. Sending SMS cooldown is 2 mins.
2. Manual override of relay (sprinkler) functions using SMS keywords:
   • VAPOR ON turns on relay regardless of temperature
   • VAPOR OFF turn off relay
   • VAPOR STATUS sends current temperature and humidity for 2 DHT11 sensors, water level, and relay(sprinkler) status if ON or OFF