The information in the article is about the water level alarm circuit using 555timer. By using this we can control the water level safely and easily.Any person can identify the water level easily by hearing the beep sound.The water level indicators are low cost in the market.The liquid level containers are huge in the companies.We can also measure the fuel level in motor vehicles.Automatically the pump will switch ON/OFF when the water level in the tank is empty and full.By using the two motors, two sumps, two overhead tanks we cannot control by a single circuit.The pumps used in the water level indicator are single phase motor, submersible motor, and in three phase motor.The water level indicator is used in Hotels, Home apartments, commercial complex, and in factories.The C3 capacitor is a decoupling capacitor it is a 100uF/16V electrolytic capacitor. The sensors can be easy to make a small piece of PCB which is etched with the proper pattern.
The water level sensor circuit it is possible to use several sensors. When the water reaches the sensor the reference voltage is below the minimum level and the IC drives the ceramic transducer to beep. The IC used in this circuit is LM1801, and it is a low power comparator and it can also deliver high output current if needed. Water Level Alarm Circuit using Level Sensor The following circuit diagram shows the water level alarm circuit. When the water level is at high or low or at exceeding the higher limit. The electronic water level alarm circuit is connected to the alarm and it is placed at the above electronic water level circuit which is having the capability of alerting the person of a home. To know the indication of the low level of water in the sump the P0.7 port is connected to the LED D7. The P0.5 port is used for regulating the pump and the Q6 transistor remains on and the relay is also activated. The Microcontroller ports P0.0, P0.1, P0.3 and P0.4 are interfaced with the LED’s to indicate the level of water and these are connected to the resistors. Hence the transistor will be on and the motor will be on. With the indication of water level in the tank the D3, D4, and D5 LED’s will glow. These are interfaced with the Microcontroller ports like P2.5, P2.6, and P2.7 when the programming is done by the Microcontroller.
IGUARD VOLTAGE INDICTION ALARM FULL
Hence the overhead tank is not full and the same process is applied to the remaining probes like 1/4th, 1/2th, 3/4th these are connected to the base terminal of the Q1, Q2, Q3 transistor. For the second transistor Q2, the collector voltage is high at P2.4. When the water level goes below the full-level probe, then the base of the second transistor Q2 opens by switching it off. If the water level is at the final probe P7 then the sound is produced by the piezo-buzzer and it is connected to the output pin 16 along with the LED7. Hence the equivalent output pins 10 to 16 will go low one after another and the LED’s from 1 to 7 will go in the order. If the water level rises in the tank, then the water comes into contact with probes which are from P1 to P7 and thus the pin 7 through 1 high sequentially. The elements which are used in this circuit are CMOS input compatible, 7- channel IC which is a Darlington array. The principle of this circuit is very easy to understand and it is very practical. Water Level Indicator & Alarm Circuit Diagram Now the buzzer will produce beep sound to indicate the water level is reached to the level. Therefore, astable multivibrator produces an oscillation which is proportional to the values of C1, R1 & R2 and resistors across the probes.
If the water level reaches the probes then the current flows in the water, hence the sound is produced by the circuit. Thus, there is no sound produced by the circuit. If the water is not up to the level of probes than the open circuit astable muiltivibrator will not produce any oscillation.
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