Free Electronic/electric Circuit diagram for many electronic project, electrical project and electromachanical.
This water-level indicator
uses a 7-segment display, instead of LEDs, to indicate the water level (low,
half and full) in the tank. Moreover, a buzzer is used to alert you of water
overflowing from the tank. The circuit shows the water level by displaying L, H
and F for low, half and full, respectively. The circuit uses five sensors to
sense the different water levels in the tank. Sensor A is connected to the
negative terminal (GND) of the power supply. The other four sensors (B through
E) are connected to the inputs of NOT gate IC 7404. When there is a high
voltage at the input pin of the NOT gate, it outputs a low voltage. Similarly,
for a low voltage at the input pin of the NOT gate, it outputs a high voltage.
When the tank is empty, the input pins of IC 7404 are pulled high via a 1-mega-ohm resistor. So it outputs a low voltage. As water starts filling the tank, a low voltage is available at the input pins of the gate and it outputs a high voltage. When the water in the tank rises to touch the low level, there is a low voltage at input pin 5 of gate N3 and high output at pin 6. Pin 6 of the gate is connected to pin 10 of gate N9, so pin 10 also goes high. Now as both pins 9 and 10 of gate N9 are high, its output pin 8 also goes high. As a result, positive supply is applied to DIS3 and it shows ‘L’ indicating low level of water in the tank. Similarly, when water in the tank touches the half level, pins 4 and 5 of AND gate N8 become high.
When the tank is empty, the input pins of IC 7404 are pulled high via a 1-mega-ohm resistor. So it outputs a low voltage. As water starts filling the tank, a low voltage is available at the input pins of the gate and it outputs a high voltage. When the water in the tank rises to touch the low level, there is a low voltage at input pin 5 of gate N3 and high output at pin 6. Pin 6 of the gate is connected to pin 10 of gate N9, so pin 10 also goes high. Now as both pins 9 and 10 of gate N9 are high, its output pin 8 also goes high. As a result, positive supply is applied to DIS3 and it shows ‘L’ indicating low level of water in the tank. Similarly, when water in the tank touches the half level, pins 4 and 5 of AND gate N8 become high.
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