We are designing the circuit which is used to detect and control the water level automatically using 8051 microcontroller. Here,the water level is indicated on LCD. This system monitors the water level of the tank and switches ON the motor whenever tank is empty.The motor is swtched OFF when the overhead tank or container is FULL. Water level controller using 8051 Microcontroller project will help in automatically controlling the water motor by sensing the water level in a tank. The same applies to other sensor probes (3/4, 1/2, 1/4) and the microprocessor understands the current level by scanning the port pins P2.Water Level Controller using 8051 Microcontroller Now its collector voltage goes high and high at P2. When water level goes below the full level probe, the base of Q2 becomes open making it OFF. Whenever water rises to the full level current flows into the base of transistor Q4 which makes it ON and so its collector voltage goes low. Consider the topmost (full level) probe, its other end is connected to the base of transistor Q4 through resistor R16. The probes for sensing 1/4, 1/2, 3/4 and FULL levels are placed with equal spacing one by one above the bottom positive probe. A positive voltage supply probe goes to the down bottom of the tank. Have a look at the sensor probe arrangement for the overhead tank in Fig1. The level sensor probes for the overhead tank are interfaced to the port 2 of the microcontroller through transistors. The circuit diagram of the water level controller is shown below. The pump is not allowed to start if the water level in the sump tank is low and also the pump is switched off when the level inside the sump tank goes low during a pumping cycle. The level of the over head tank is indicated using 5 leds and the pump is switched of when the over head tank is filled. Telephone Circuits ▼ Telephone CircuitsĮt limit.Converter Circuits ▼ Converter Circuits.Oscillator Circuits ▼ Oscillator Circuits.
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