Water Level Indicator Alarm With Transistor & 555 Timer IC

In this project, I will be going to show you a water level indicator using transistors and 555 timer IC. Water tank flow is a typical issue that prompts the wastage of water. In spite of the fact that there are numerous answers for it like ball valves which consequently stop the water stream once the tank gets full. So here is a straightforward and helpful DIY that will control you to make a circuit that will distinguish the water level and will raise a caution alarm after getting the water tank full.

Transistor Based Water Level Indicator

This simple transistor-based water level indicator circuit is valuable to demonstrate the water levels in a tank. At whatever point the tank gets filled, we get cautions on specific levels. Here we have made 4 levels (low, medium, high, and full), we can make alerts for additional levels. We have added 3 LEDs to demonstrate the underlying three levels (A, B, C), and one Buzzer to show the FULL level (D). At the point when tanks get filled totally we get blare sound from Buzzer.

Circuit Diagram

Components Required

  • BC548 transistors
  • 2.2 KΩ Resistors
  • 100 Ω Resistors
  • Led (Red, Green, Yellow)
  • Wires

Circuit Connection

In this water level indicator, we need to take the three NPN type transistors and short all three emitter terminals of the BC548 to the ground.

All the collector terminals are of each transistor are connected with red, yellow, green LEDs’ anode part respectively with 100 Ω resistors and all cathodes of these LEDs are connected with each other to the Vcc.

At last, all three base terminals are represented as the outputs (L2, L3, L4) of the circuit and attached to the container with 2.2 KΩ resistors as shown in the circuit schematic.

A direct positive supply is attached to the bottom of the container (L1).

Working of Water Level Indicator

The water level indicator circuit is intended to show three levels of water put away in the tank; low however not vacant, half, and full yet not overflowing. 

When there is no water in the tank, all the LEDs are off as a sign that the tank is totally unfilled. 

At the point when water level increases and arrives at L2, the contacts L1 and L2 get shorted as water goes about as a conducting medium somewhere in the range of L1 and L2. 

This will turn on the transistor Q1 and the Green LED begins to sparkle. As the water level keeps on rising and arrives at a large portion of the tank, L3 will come into contact with water and gets a little voltage from L1.

Subsequently, Q2 is turned on and the Yellow LED will shine. At the point when the water in the tank ascends to a full tank, L4 is additionally shorted with L1 and both Q3 and Q4 will turn on. 

The Red LED shines and furthermore a caution sound is made by the signal as a sign that the tank is full and the water siphon or engine can be killed. 
555 Timer Based Water-Overflow Alarm

555 Timer Based Water Level Indicator

water level indicator

Circuit Diagram

water level indicator

Components Required

  • NE555 Timer
  • 1 KΩ Resistor
  • 10 KΩ Potentiometer
  • 1uf/25V Capacitor
  • Piezo Buzzer
  • Wires

Circuit Connection

To begin the water level indicator project, we need a 555 timer IC to put on the board and connect pin 8 to the Vcc and pin 1 to the ground.

connect pin 2 and pin 6 with each other and grounded with a 1uf/25V capacitor.

Connect pin 4 to the ground through a 1 KΩ resistor. 

A 10 KΩ pot is connected between pin 6 and pin 8 with these side terminals and the middle terminal is connected with pin 7 of the IC.

Then a small piezo buzzer is connected through pin 3 of the IC and a resistor of 1 KΩ is connected between pin 3 and ground. 

The two input probe is connected with pin 4 and pin 8 of the IC.

Working Water Level Indicator

The water level indicator circuit utilizes a 555 timer clock in astable mode with R1=22 KΩ, R2= 570 Ω, and C1=1uF/25V. The recurrence frequency of the given astable circuit is around 62 Hz. 

The two probes which are appeared in the circuit ought to be kept at a significant level for the water. The separation between the probes ought to be not exactly a couple of centimeters to guarantee that the conduction between the probes will occur when water is contacted to these probes. 

At the point when the water level reaches the tallness of the probes, at that point, the 555 timer circuit will get empowered and the output of the 555 timer clock creates a square wave output with a recurrence frequency of around 62 Hz. This output is given to the buzzer.

The logic Implemented in this circuit is, 555 timer clocks are empowered when its reset pin is associated with a logic high. Yet, at first, it is associated with ground. At the point when the water level is greatest, this pin is empowered and this drives the 555 timer clocks into the astable mode.

Application of Water Level Indicator

  • It very well may be utilized in water tanks to control water levels. 
  • Consequently, turn ON/OFF siphons. 
  • Water level indicator can be utilized in manufacturing plants, business buildings, condos, homes.
  • Fuel tank level checking.
  • Oil tank level control.
  • High and low-level alerts.
  • Pool water level control.
  • Life station switches.

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