This easy but effective circuit can be utilized to keep an eye fixed on water level in a container. The prototype is used to pump water out of a bucket that accumulates condensation from a house air-conditioning gadget. The design is primarily based around a 555 timer (IC1). Although the timer in configured as a mono-stable, it lacks the usual timing capacitor from pin 6 to floor. Instead, a metal probe inserted in the water offers a present course to a second, floored probe. When the water degree within the container reaches a third (\"high\") probe, the trigger input (pin 3) is pulled low, swaping the 555 output high and energizing the relay by the use of transistor Q1.
Circuit diagram:
Cheap Pump Controller Circuit Diagram
Once the water degree drops below the \"low\" probe, the brink input (pin 6) swings high, swaping the output (pin 3) low and the relay and pump off. The two 100kΩ pull-up resistors will also be replaced with larger worths if extra sensitivity is required (eg, if the 555 doesn’t trigger). A change (S1) can be integrated to avoid the relay for handbook emptying. The \"low\" probe should be placed in order that the pump doesn’t run dry.
The high degree probe is positioned on the degree that you want the pump to begin out. Since the water is held at ground potential, it's a should to use stainless-steel or copper wire to gradual corrosion. With water fountain pumps available for not up to $10, this circuit offers an affordable alternative for folks who have an air-conditioner on an interior wall and don’t need to be regularly emptying the bucket on humid days.
http://www.ecircuitslab.com/2011/08/cheap-pump-controller.html
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