This water level alarm circuit diagram shows a simple way to use a 555 timer to sound an alarm when the water level goes up. It’s relatively easy to use and can be powered by a 3V battery.
Water Level Alarm Schematic Circuit Diagram
Components Required for Water Level Alarm Circuit
This is the component required, and the legend for water level alarm circuit above:
- a good quality Breadboard.
- 1 = Buzzer.
- 3 = Colour LEDs – red, green, and yellow.
- 4 = BC547 transistors.
- 5 = 9v battery and the battery clip.
- 6 = 220 ohm resistors.
Notes:
- Put the circuit together on a high-quality PCB or a standard circuit board.
- The probes can be made from two insulated copper aluminum wires.
- The circuit can be powered by a 3V battery.
The multivibrator is connected to IC1 in this circuit. The operating frequency of the device will be determined by the resistances R1, R2, and C1 of the capacitor. If there is no water around the wires, the multivibrator will not produce any oscillations. It will also not beep if there is water in the water.
When the water level reaches the sensing probes, the circuit will be temporarily closed. The multivibrator will then start producing oscillations at a frequency corresponding to the resistances R1, C1, and R2. If the water level reaches the level of the sensors, the device will beep.
The purpose of this circuit is to indicate the various levels of water that are stored in a tank. If there is no water in the tank, all of the LEDs on the device will be off, which means that the tank is empty. When the water level reaches M2, the contacts M1 and M2 will get shorted, as water acts as a conductor between the two.
The green LED will start to glow when the water level reaches half the tank. As the water level continues rising, the contact between M3 and water will cause the latter to receive a small amount of voltage from Q1. This will cause Q2 to turn on and the Yellow LED to glow. When the water level reaches full tank, both Q3 and Q4 LEDs will turn on.
The red LED will also glow when the water level reaches full tank. This will signify that the tank is full and the motor or pump can be turned off.