555 water level control circuit diagram composed of 555 and music circuit

Published:2011/8/17 2:35:00 Author:Rebekka | Keyword: 555 , water level control , music circuit | From:SeekIC

1, 2, 3, 4 are four probes. When the surface declines and pin 3 exposes, the pin2 of IC1 is a low level(<1/3 VDD). 555 sets, J pull-in, solenoid valve starts to work and water injects to container. At the same time, IC2 is triggered and play a song to inform you it is going to inject water. When the water resistance between 1 and 2 makes the potential of pin6 rises higher than 2/3VDD and trigger the level, 555 resets, pin 3 turns to low level. J releases, the solenoid valve power turns off. Probe 4 is insurance probe, when the surface of water rises to probe 4 because of any reasons, VT1 will be conducted and turned to a low level, it forces 555 resetting and turning off the solenoid valve.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_water_level_control_circuit_diagram_composed_of_555_and_music_circuit.html

Print this Page | Comments | Reading(3)