Aquarium-Auto-Refill

Code, diagrams and schematics for a aquarium refill controller

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What such device should do:

• Checks water level
  • If water level is lower than specified, controller turns on a pump
  • When pump runs for longer than specified, it is cut off
• Displays time and date
  • In future, this will be used for controlling lighting of the aquarium
    • At a specific time controller will turn on specific channels
• Checks temperature of the water

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Parts and libraries used for this project

• Arduino UNO
• DS18B20 digital temperature sensor
  • Libraries
    • OneWire.h (https://github.com/PaulStoffregen/OneWire)
    • DallasTemperature.h (https://www.arduino.cc/reference/en/libraries/dallastemperature/)
• DS1302 RTC module
  • Libraries
    • virtuabotixRTC.h (https://github.com/chrisfryer78/ArduinoRTClibrary)
• LCD1602 display with i2c module
  • Libraries
    • Wire.h (https://www.arduino.cc/en/reference/wire)
    • LiquidCrystal_I2C.h (https://www.arduino.cc/reference/en/libraries/liquidcrystal-i2c/)
• HC-SR04 ultrasonic ranging module
• 4ch relay (Now we are using only one channel, but 3 extra channels are making some room for the future)
• Pushbutton

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Diagrams and schematics

If you don't have Fritzing and you can't open diagrams and schematics here are screenshots for you:

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Completed project

Below you can see device build using this code and diagrams. Error on a first photo comes from a broken thermometer.