Water Level Controller using 8051 Microcontroller

This system mainly works on a principle that “water conducts electricity”. The four wires which are dipped into the tank will indicate the different water levels. Based on the outputs of these wires, microcontroller displays water level on LCD as well as controls the motor.

Circuit Components:

• At89c51 controller
• At89c51 programming board.
• 16*2 LCD
• 5V Relay
• Bc547 (NPN) transistors – 5
• Resistors (1K) – 4
• Resistor – 330 ohm
• AC Motor
• Pot – 10k
• Programming cable
• Connecting wires

Water Level Controller using 8051 Circuit Design:

The main heart of this project is AT89C51 microcontroller. The water level probes are connected to the P3.0, P3.1, P3.2, and P3.3 through the transistors. Port P2 connected to the data pins of LCD and control pins RS, RW and EN of LCD are connected to the P1.0, P1.1, and P1.2 respectively.

Initially when tank is empty, LCD will display the message EMPTY and motor runs automatically. When water level reaches to quarter level, now LCD displays QUARTER and still motor runs. For further levels, LCD displays the messages HALF and ¾ FULL.

When tank is full, LCD displays FULL and motor automatically stops. Again motor runs when tank is empty.