Type: Voltage Regulator
12VDC voltage byVD1, All the way throughR7Luminous tube lightsLED1As a power indicator, the other way as the power supply system. After power on, if there is no water in the tank, both by the level probeR1,R2Is connected to the positive supply, is a high potential,IC1of4Pin output low, theIC1CAfter the treatment,10Pin output high, this high level all the way throughR4AddedVT1The base, soVT1Saturated conduction, the relay is energized to start the pump the water; another pathR8ReceivedIC1of2Foot, due to the high level probe also is high, after NAND gate process,IC1of3Pin output is low, theIC1CNAND gate locked. With the pumps to keep the water tanks, the water level in the tank gradually increased, when the low-level probe dipped in waterIC1of6Pin goes low,4Pin output high, but this time the NAND gate has been locked, and therefore will not affect the output, pump continues pumping; along with a further increase of water level, when the water level hit a high level probe,IC1of1Foot and6Feet goes low, this changeIC1of4Feet did not affect, and3Foot because1Pin goes low, the output is high, soIC1of8,9Feet are high,10Pin will output low, the relay de-energized, the pump stops pumping, but also by the low levelR8Added2Feet, so3Pin held high. Until the water level falls below the low level probe again, the turn weight foregoing process, and thus the water level in the tank and automatic control. The circuit design manual control circuit, when the pressWARWhen the switch will force the relay open.
1Pcs Water tank water level automatic control Kit DIY