This ULN2003 Hack Saves Hundreds in Water Bills #savemoney #diy #smart

A water level indicator detects and indicates the level of water in an overhead tank and relays the information back to a control panel to indicate whether the tank has a high or low level of water. In this tutorial, I'm going to use the ULN2003 IC to create a simple inexpensive water level indicator. Using this circuit, you can easily control the wastage of water and electricity. So this is how my board looks like in 3D. Let's solder all the components to the board. Let's first solder all the resistances to the board. Then let's solder all the LEDs to the board. I am using a 3mm green LED as the power indicator. Next, I'm soldering the IC base to the board. Since I care a lot about my ICs and microcontrollers, I never solder them directly to the board. In case of an IC, I always try to use an IC base or if a base is not available, I use female pin headers. After soldering the IC base, I'm soldering the buzzer to the board. For my setup, I am only using half a meter long cable. But in a real world scenario, you will definitely need a cable way longer than this.