Automatic water level_controller
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This document describes an automatic water level controller circuit using a NE 555 timer IC. The circuit uses two probes placed at different water levels in a tank. When the water level drops below the bottom probe, the 555 timer output goes high, turning on a relay that activates a motor to pump more water. When the water reaches the top probe, it resets the 555 timer output low, turning off the motor. The circuit provides a simple way to automatically maintain the water level between two set points using common electronic components.
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Automatic water level_controller
- 1. Indian Institute of Technology Hyderabad AUTOMATIC WATER LEVEL CONTROLLER Presented by AKASH SHUKLA KUSHAL
- 2. Components required Power Supply(6v) NE 555 timer IC Resistors (100Ωx2, 10kΩ) Relay (6V, 30A) BC 548 transistor x2 1N4007 Diode
- 3. Circuit
- 4. How Does It Work We know the property of 555 timer IC, i.e. its output goes HIGH when voltage at the second pin(trigger pin) is less than 1/3 Vcc. Also we can reset back the IC by applying a LOW voltage at the 4th pin (Reset pin). In this project 3 wires are dipped in water tank. Let us define two water levels- Bottom (Low) level and Top (Up) level. One of the wire or probe is from Vcc.
- 5. When water level goes down, the 2nd pin gets disconnected(untouched) from water i.e. voltage at the trigger pin becomes less than Vcc. Then the output of 555 becomes high The probe from bottom level is connected to the trigger (2nd) pin of 555 IC. So the voltage at 2nd pin is Vcc when it is covered by water.
- 6. While the water level rises, the top level probe is covered by water and the transistor becomes ON. Its collector voltage goes to Vce=0.2. The low voltage at the fourth pin resets the IC. So the output of 555 becomes 0 volt. Hence the motor will turn of automatically. For simple demonstration of this project we can use a DC motor directly at the output of 555 instead of relay. For practical implementation we must use a relay. Rating of relay is chosen according to the load(motor). 32A relay is best suited for domestic applications.
- 7. NE 555 timer IC