Tuesday, September 19, 2017

Microcontroller Project: Water Level Controller-Cum-Motor Protector Based on 8051

Robometricschool. - This is one of the application of microcontroller 8051 from ATMEL for building water level controller with motor protector for you. It is seem be nice when you can build this water controller system yourself. 

In here beside we will give you the description, circuit schematic, and other component needed, we also will give you to you to read more about the complete project from other source.

Circuit Schematic

Figure 1. Circuit schematic of Water Level Controller-Cum-Motor Protector Based on 8051 (Source: Electronicsforu)

Component Parts

  • Bridge Diodes
  • Optocoupler
  • Relay
  • Resistors
  • Capacitors
  • AT89C51 IC
  • Transistor
  • LCD Module
  • 7805 IC
  • LM324
  • Electrodes


Accordingly Electronicsforu site that published this circuit describe that the circuit of the microcontroller-based water level controller-cum-motor protector. It comprises operational amplifier LM324, microcontroller AT89C51, optocoupler PC817, regulator 7805, LCD module and a few discrete components.

The AT89C51 (IC2) is an 8-bit microcontroller with four ports (32 I/O lines), two 16-bit timers/ counters, on-chip oscillator and clock circuitry. Eight pins of port-1 and three pins of port-3 are interfaced with data and control lines of the LCD module. Pins P3.0, P3.1 and P3.6 are connected to RS (pin 4), R/W (pin 5) and E (pin 6) of the LCD, respectively. Pin EA (pin 31) is strapped to Vcc for internal program executions. Switch S2 is used for backlight of the LCD module.

Power-on-reset is achieved by connecting capacitor C8 and resistor R14 to pin 9 of the microcontroller. Switch S1 is used for manual reset.

The microcontroller is operated with a 12MHz crystal. Port pins P2.0 through P2.2 are used to sense the water level, while pins P2.3 and P2.4 are used to sense the under-voltage and over-voltage, respectively. Pin P3.4 is used to control relay RL1 with the help of optocoupler IC3 and transistor T5 in the case of under-voltage, over-voltage and different water level conditions. Relay RL1 operates off a 12V supply. Using switch S3, you can manually switch on the motor. Read more here


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