Home » Its Possible To Make Fire Alarm at Home? lets Try It

Its Possible To Make Fire Alarm at Home? lets Try It

by kevinfiske.com

Creating a fire alarm at home can be a useful safety measure. Here’s a simple circuit diagram and step-by-step guide to help you make one:

circuit diagram

+---------+              +--------------+
|         |              |              |
|   LM35  +-----+--------+  LM358       |
|  Temperature |     |        |   Op-Amp   |
|   Sensor  |     |        +---+    (IC1)    |
|         |     |            |              |
+---------+     |            +---+  +---+
                |                |  |   |
                |       +--------+--+  |  Buzzer
                |       |             |   |
                |       |             +---+
                |       |
                |       |
                |       |    +--------+
                |       +----+  LED   |
                |            +--------+

Parts Required

  1. LM35 Temperature Sensor
  2. LM358 Op-Amp IC (or similar)
  3. Buzzer
  4. LED
  5. Resistors (1kΩ, 10kΩ)
  6. Breadboard and Jumper Wires
  7. Power Source (e.g., 9V Battery)

Step-by-Step Guide:

  1. Setup the LM35 Sensor: On the breadboard, place the LM35 temperature sensor. Attach its GND pin to the ground rail, its VCC pin to the breadboard’s positive rail, and its output pin to one of the LM358 Op-Amp IC’s input pins (let’s name this pin 2).
  2. Connect the LM358 Op-Amp: Place the Op-Amp IC LM358 on the breadboard. Attach the device’s GND pin to the ground rail, VCC pin to the positive rail, and pin 1 (output) to the positive rail via a 1kΩ resistor. Attach pin 2 (the inverting input pin) to the LM35 sensor’s output. Attach the non-inverting input pin (pin 3) to a reference voltage (you can use a voltage divider by connecting the midpoint to pin 3 and using two 10kΩ resistors connected between VCC and GND).
  3. Add the Buzzer: Attach the buzzer’s positive terminal to the LM358’s output pin (pin 1) and its negative terminal to the ground rail.
  4. Install the LED: Attach the LED’s positive leg to pin 1 of the LM358 (output), and its negative leg to a resistor that limits current (about 220Ω). Finally, attach the resistor’s other end to the ground rail.
  5. Connect the VCC and GND rails to the positive and negative terminals of your power source, respectively (e.g., a 9V battery).
  6. Testing: Now, when the temperature sensed by the LM35 sensor exceeds a certain threshold (determined by the LM358’s configuration), the output of the Op-Amp will trigger both the LED and the buzzer, indicating a fire alarm.

Remember to double-check all connections and components before powering up the circuit. Additionally, it’s crucial to ensure safety measures are in place when dealing with electronic circuits, especially those involving power sources.


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