In this tutorial we are going to learn, How to make “Water Level Controller”
For this we required:-
- Resistors (R1…….R5= 1K),(R6…….R9=4K7)
- Capacitors (C1=1000uF/16V),(C2=47uF/16V),(C3……..C5=0.1u Disc)
- Semiconductors (U1=7805,U2 (IC)(N1-N4)=7400,U3(IC)(N5-N8)=7400,(T1……T4=BC548),(T5=SL100),(D1=IN 4007)
- Miscellaneous (Relay=12v-150E)
A Number of small and complex circuit have appeared earlier for water level controller but most of them swtich the motor on whenever the water level in the overhead tank decreases some of them do not bother about the water in the ground level tank.Thus we end up with burnt motors,which try to pump up non-existent water from ground level to the overhead tank.
The motor is not switched ‘on’ and ‘off’ every few minutes but only when the tank is completely empty.The modified version of ‘improved water level controller’has been provided with two flip-flops for the two tanks and each tank has three probes to monitor its status.
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The operation of the circuit is self-explanatory.When there is no water in the overhead tank transistor T1 and T2 d not conduct,which reset the flip-flop comprising gates N1 and N2.since its Q output is used the output fed into n3 is ‘1’.
When the underground tank is full, transistor T3 and T4 both conduct ,thereby setting the flipflop compising N7 and N8 whose Q output namely ‘1’ is fed into N3. the output of N3 is ‘0’ which is inverted and used to trigger transistor SL 100, and the motor is thus switched on.
The arrangement of the probes in the two tanks are given. The instructions have to be strictly followed to ensure faultless operation.