The scenario
This diagram shows a 555 timer IC configured as a set/reset flip-flop to control a water pump based on two water level probes.
What is in this drawing
Read the decisions behind it.
01
Using 555 timer in set/reset mode instead of timing mode
02
Adding flyback diode to protect transistor from inductive kickback
03
Using pull-up and series resistors for probe sensing
Suitable for small-scale water level control applications where automatic pump control is needed to maintain water level within a range.
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