the circuit of constant temperature controller for fish breeding(2)

Published:2011/6/15 7:18:00 Author:Ariel Wang | Keyword: constant, temperature, controller, fish, breeding | From:SeekIC

When the temperature of water is lower than the set temperature,the value of RT's resistence increases.The voltage of pin-2 of IC is lower than Vcc/3.Pin-3 of IC outputs high level.K is conducted to pull in.The normally open contacts K1 is conducted.The electric heater EH is conducted to work.Heating indicator LED VL2 is lighted.As the temperature of water goes up and up,the value of RT's resistence decreases.When the temperature of water goes beyond the setwater temperature,the voltage of IC's pin-2 is beyond Vcc/3.The voltage of Pin-3 becomes low level from high level.K is released.EH is power-off.And it stopes heating.V12 goes out of light.It goes on and on.Then the temperature of water can stay around the set temperature.



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