This simple rain alert circuit detects rain using a water-sensitive probe. When raindrops touch the probe, it allows current to flow and activates the NPN transistor (Q1), which in turn activates the PNP transistor (Q2). This triggers a speaker to produce a buzzer sound, warning users. The tone can be adjusted using an oscillator part of the circuit. It helps protect items like clothes by providing an early rain warning.
Components
- BC558 Transistor
- BC548 Transistor
- 10k Resistor
- 330k Resistor
- 1mf Capacitor
- Small Speaker
- Prob Sensor
- 3V Battery
Circuit Diagram
