The fig shows block
diagram of SMS based fire detection system.
It consists of
following blocks.
Power Supply:
Power supply is used to
provide voltage to the Microcontroller, LCD, sensors, ADC, buzzer etc.
Sensors:
Sensor
are basically use to convert physical quantity (eg. Temp, smoke etc) in
electrical form (voltage, current etc.)
there are different sensors available for various physical
quantity.
For FIRE detection we use Smoke
sensor MQ2, Temp. Sensor LM35 & fire sensor.
If smoke is detected, then smoke sensor (MQ2: smoke to analog
voltage) give signal to the ADC. The temp sensor LM35 (temp to analog voltage)
sense the temp if it exceeds the max temp level then it sends the signal to the
ADC. If fire is detected, then fire sensor gives signal to the microcontroller.
ADC:
ADC is used to convert analog signal into
digital form. In
our project we use ADC0808. ADC receive signal from temp sensor & smoke
sensor & convert it into digital form & this digital signal sends to
the microcontroller.
Microcontroller:
Microcontroller is the main
control unit of project. Once microcontroller gets signal from sensors (via
ADC), if fire is detected then it will immediately turn on the buzzer &
send the signal to the GSM modem.
GSM modem:
In project we used GSM
modem for message sending.
When microcontroller detects fire then it
sends information to the GSM modem, then GSM modem sends this information via
SMS. GSM modem is used to send the message to the fire stations well as to the
responsible person.
16x2 LCD:
Display is used to display the system status.
Buzzer:
Buzzer is used for notification regarding
fire detection.
If fire is detecting, then microcontroller
sends signal to the buzzer.
