Water Level Controller Circuit Diagram. Here is automatic water pump tank controller circuit diagram. So current through r5 and d1 to trigger base of q3 cause q3 conducts current to cause the transistor q4 also works.
Uln2003 is a 7 step darlington transistor array network inside a single ic chip. The darlingtons are reasonably rated to handle current up to 500 ma and voltages up to 50 v. 5 9v battery battery clip.
Water level controller circuit water level controller circuit.
3 colour leds red green and yellow. Uln2003 is a 7 step darlington transistor array network inside a single ic chip. Such sensors are more reliable than induction type sensors. When there is enough water in the underground tank probes c and s are connected through water.
