abdul991
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Hello Guys,
Please help me out with this model as 'm struck.
I've a built a ckt which uses simple conducting wires to indicate water levels (12V DC wire at bottom with 3 levels --low , middle and top). This is same for underground tank and over head tank. I'm using LEDs total 6( 3 for overhead tank and 3 for underground tank) with 100 Ohm resistor connected to ULN 2003. These LEDs are driven by 5V supply.
Anode connected to common 5V and cathode to the pins of ULN2003 output via 100Ohm resistors.
The problem is the 3 LEDs are getting faded for overhead tank and get OFF even though the water is present in all levels.
Also the power supply i'm using Adopter(12V 500mA) Bridge rectifier followed with filter and IC7805. IC7805 is also getting hot if its ON for more than half hour. I want to keep this ckt ON for all the time. Please let me know how to rectify this problem. I later intend to make a water level controller, But i'm struck with this itself.:-|
Please help me out with this model as 'm struck.
I've a built a ckt which uses simple conducting wires to indicate water levels (12V DC wire at bottom with 3 levels --low , middle and top). This is same for underground tank and over head tank. I'm using LEDs total 6( 3 for overhead tank and 3 for underground tank) with 100 Ohm resistor connected to ULN 2003. These LEDs are driven by 5V supply.
Anode connected to common 5V and cathode to the pins of ULN2003 output via 100Ohm resistors.
The problem is the 3 LEDs are getting faded for overhead tank and get OFF even though the water is present in all levels.
Also the power supply i'm using Adopter(12V 500mA) Bridge rectifier followed with filter and IC7805. IC7805 is also getting hot if its ON for more than half hour. I want to keep this ckt ON for all the time. Please let me know how to rectify this problem. I later intend to make a water level controller, But i'm struck with this itself.:-|