Fire Alarm Using IR
- Product SKU: LGKT033
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Using IR Fire Alarm is an automatic fire alarm system designed to detect the unwanted presence of fire by monitoring changes in the environment associated with flaming. The IR Receiver sensor detects the fire and generates an analog voltage. This variation is monitored by forming a potential divider circuit.
In this Electric Fire Alarm Kit, analog variation is converted into digital form using a dual op-amp IC LM358. The op-amp is used as a comparator in non-inverting mode to do so. In this operation, we set a reference voltage with the preset (potentiometer). If the analog voltage from the sensor is greater than Vref, then the output is logically high on pin 7 else it is low. The analog input is connected to the pin5 of LM358. The output from the LM358 drives the ULN2803 IC (it act as a current amplifier to meet the current requirement to drive the relay).
This Fire Detector Kit is an inverted IC means when input is low output is high and vice versa. This IC drives the relay to activate the alarm which is a piece buzzer. The relay acts as an electromagnetic switch to switch the high voltage to activate the buzzer.
- Dimensions (cm) L x W x H : 20 x 15 x 5
- Weight (gm): 200
Thank you very much for such an amazing product since it helped me a lot to earn marks in my last year's boards practical.
Saves a bunch of time, actually works really well!
Enjoyed playing with my son, assembled and working successful. Thanks for making such product.
How to build:
First of all read the given manual thoroughly and study the circuit given in the figure. Also have look at PCB and components supplied along with the kit. Each component has to be soldered in its position on PCB.
Value for money, easy to assemble and use