HydraSafe – Automatic Drinking Water Temperature Controller 🌡️💧

A fully automatic, energy-efficient system that keeps your drinking water at the perfect temperature (15–45 °C) all year round — no buttons, no displays, no manual switching.

Detailed Working Principle (Step-by-Step)

1. System Startup
   As soon as the 12 V 10 A adapter is connected, the Arduino Nano powers up and initializes all sensors and the BTS7960 driver.

2. Real-Time Temperature Monitoring
   Every 2–5 seconds the Arduino reads:

   • Ambient (room) temperature → using DHT11
   • Water temperature inside the tank → using waterproof DS18B20 sensor(s)

3. Intelligent Decision Making
   The brain (Arduino) constantly decides the mode:

   • Winter Mode (ambient < 20 °C) → Turn on Heating
   • Summer Mode (ambient > 30 °C) → Turn on Cooling
   • Comfort Zone (20 °C ≤ ambient ≤ 30 °C) → Keep Peltier OFF (saves maximum power)

4. Peltier Heating & Cooling Action

   • BTS7960 H-bridge supplies high current (~6–8 A) to the two TEC1-12706 Peltier modules
   • Heating: Current flows in forward direction → hot side pressed against water tank → water warms up quickly
   • Cooling: Current direction reversed → cold side against tank → water cools down while large aluminium heat sinks + 12 V fans remove heat from the hot side
   • The system automatically stops the Peltier as soon as water temperature enters 15–45 °C range (hysteresis logic prevents frequent on/off)

5. Continuous Loop
   The entire process repeats forever → adapts instantly if the weather changes during the day.

Key Advantages

• ~40 % lower electricity bill compared to always-running kettle or water chiller
• Zero noise (except quiet fans)
• No moving parts except fans → extremely reliable
• Low cost (entire build under ₹3500–4500)
• Completely set-it-and-forget-it operation

Components List

• Arduino Nano (brain)
• TEC1-12706 Peltier modules (heating + cooling element)
• Large aluminium heat sinks + 12 V cooling fans
• BTS7960 high-current dual H-bridge driver
• DS18B20 waterproof temperature sensors (water temperature)
• DHT11 sensor (ambient temperature)
• IR proximity sensor (reserved for future glass-detection upgrade)
• 12 V 10 A SMPS AC-to-DC power adapter

Files in this Repository

• HydraSafe.ino → Complete, well-commented Arduino source code (ready to upload)

Personal learning & portfolio project
MIT Licensed → feel free to use, modify, and build your own!

⭐ Star the repo if you like the idea or plan to build it!