Fire Alarm Using IR
₹517 – ₹804
- Product Code: LGKT033
- Power supply: No battery included, Includes DC adapter if required with the kit
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Shipping DetailsUsually delivery in 2-3 days
The kit Fire Alarm an automatic fire alarm system is designed to detect the unwanted presence of fire by monitoring environmental changes associated with combustion.
In the kit Fire Alarm the IR Receiver sensor detects the fire and generates an analog voltage. This variation is monitored by forming a potential divider circuit. This analog variation is converted into digital form using 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 than the output is logical 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 current amplifier to meet current requirement to drive the relay). It 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 piezo buzzer. The relay acts as electromagnetic switch to switch the high voltage to activate the buzzer.
- Dimensions (cm) LxWxH: 18 x 15 X 7
- Weight (kg): 0.5