DIY Club

  Project 5: DIY Water Level Alarm Objective: To build a water level alarm that alerts when the water reaches a certain level in a tank. Components Required: NPN Transistor (BC547) Buzzer (5V or 9V) Resistors – 1KΩ and 330Ω LED (optional for indication) Battery – 9V Two Wires (for water sensing probes) Breadboard & Connecting Wires Circuit Diagram: (You can use Tinkercad or Fritzing to design the schematic.) Step-by-Step Instructions: Step 1: Prepare Water Level Sensors Take two wires and insert them into the tank at the desired water level. One wire connects to +9V and the other to the base of BC547 via a 1KΩ resistor . Step 2: Connect the Transistor The emitter of BC547 connects to ground (-) . The collector connects to one leg of the buzzer and LED (optional). The other leg of the buzzer connects to +9V . Step 3: Power the Circuit Connect a 9V battery to power the circuit. How It Works: When water touches both sensing wires, it closes the circuit , allowing a smal...