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What is the use of transistor in rain alarm?

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What is the use of transistor in rain alarm?

What is a Rain Sensor Alarm? A rain sensor alarm senses and gives a signal to the buzzer when water droplets from rain fall on its surface. Thus as soon as it comes in contact with water, the buzzer starts beeping. We are going to build this rain sensor using transistors due to their high current gain capacity.

Which regions in a PNP transistors are p type doped?

In NPN transistor Emitter and Collector region are doped with n-type while the base region is doped with p-type. But doping in PNP transistor is just opposite to that of NPN. Here Emitter and collector regions have p-type doping and Base region has n-type doping.

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How do you make a rain alarm step by step?

How to Make Rain Alarm Circuit Using BC547 Transistor

  1. Step 1: Take All Components As Shown Below. Components required –
  2. Step 2: Circuit Diagram.
  3. Step 3: Make Pcb Like This.
  4. Step 4: Connect Buzzer.
  5. Step 5: Connect LED.
  6. Step 6: Connect Battery Clipper.
  7. Step 7: Connect Wires.
  8. Step 8: Solder Collector and Base Wire in the Pcb.

How do you make a rain alarm circuit?

Components Required

  1. 1 x Small Rain Sensor.
  2. 1 x 555 Timer IC.
  3. 1 x BC548 NPN Transistor.
  4. 2 x 2N2222 NPN Transistor.
  5. 1 x Bright White LED.
  6. 1x 1N4007 PN Junction Diode.
  7. 1 x 220 KΩ Resistor (1/4 Watt)
  8. 1 x 330 Ω Resistor (1/4 Watt)

How do you make a rain alarm circuit diagram?

What is rain sensor module?

The rain sensor module is an easy tool for rain detection. It can be used as a switch when raindrop falls through the raining board and also for measuring rainfall intensity. Connected to 5V power supply, the LED will turn on when induction board has no rain drop, and DO output is high.

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What is rain alarm circuit?

Rain Alarm Circuit consists of three main components that include Rain sensor, 555 Timer IC and a buzzer. The heart of rain alarm circuit is rain sensor which is used to detect the presence of water. When rain drops falls on the sensor, it creates a conducting path and triggers the 555 Timer IC.