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.
Department/Area of interest: ( To list the projects / paper presentations)
Electronic projects: Water level indicator
Comments (3)

Sort by: Date Rating Last Activity
Loading comments...
Comments by IntenseDebate
Posting anonymously.
dgdgdf455 · 185 weeks ago
Meanwhile, players like Adobtalogue. Gilt and Etsy are two other companies that deploy the similar image-detection tools to find similar items of clothing.
Meanwhile, players like Adobtalogue. Gilt and Etsy are two other companies that deploy the similar image-detection tools to find similar items of clothing.
Meanwhile, players like Adob
fdgfdg · 185 weeks ago
gasoinee · 185 weeks ago