Water level control circuit

Published:2011/7/2 21:28:00 Author:Lucas | Keyword: Water level , control | From:SeekIC

Figure 2-23 (a) shows the sensor. There are two pairs of wires being installed in the corresponding water level A and C inside of the PVC pipe, only when the water level rises more than A, B and C, the pump will stop running. When the water level drops below the C and B, pump will maintain working. Only when the water level is lower than A, the pump is switched on to run. Figure 2-23 (b) shows the pump motor control circuit. In the circuit, Al-A4 use 5V single supplied TLC2274 op amp. Among them, Al and A2 form the comparator to control D flip-flop 7474 and add the reference voltage with about 4V at inverting input end of A3 and A4.



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