555 automatic water supply circuit with the magnetic card to get water

Published:2011/6/13 20:27:00 Author:TaoXi | Keyword: 555, automatic, water supply circuit, magnetic card | From:SeekIC

This circuit is composed of the step-down rectifier circuit, the magnetic control trigger and relay control electromagnetic valve circuit.etc, as the figure 15-41 shows. The HG is the reed pipe magnetic control switch, it is usually in the disconnected state, the monostable delay circuit is composed of the HG, 555, RP1, R2 and C2, the charging voltage (>2/3VDD) of C2 makes the 555 in the reset state, the relay K will not work. If the user put the magnetic card into the entrance, when the magnetic card gets through the reed pipe HG, the contact point closes, the pin-2's low electrical level of the 555 sets the 555, the pin-3 has the high electric potential, the relay K gets power to close, the contact point K1-1 closes too, the electromagnetic valve DF opens to prevent the water.



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