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the other register aid in character values. It is commonly used module and mostly
preferred because of its easy programmable, economic and display many special
characters. Arduino is an extraordinary stage for prototyping to interface sensors,
LCD, etc.
2.3 Temperature Sensor
A DTH 11 Sensor use in detecting the flame around the region. The heat waves which
are generated due to the abnormal temperature got sensed. DHT11 temperature sensor
consists of four pins: VCC, Data Out, Not Connected (NC) and GND. The range
of voltage for VCC pin is 3.5–5. 5 V. A 5 V supply would do fines. A single wire
communication can be instituted between any microcontroller like Arduino and the
DHT11 Sensor.
2.4 Power Supply
To turn on the board power supply in the range of 6–20 V is to be supplied. On the
chances of supplying more than 12 V, the voltage controller unit may get overheated
and may harm the board. Hence, the range prescribed will be 7–12 V. In this case
using the step-down transformer, the voltage will be stepped down. Furthermore, the
components such as sensors, display need various volts. Bridge rectifier is used to
split the supplied volt into required volt. In this case, we splitted as 5 V and 12 V
for sensors, alarm and exhauster, respectively. ARDUINO is controlled by USB link
originating from the PC.
2.5 Arduino UNO Board
Arduino is an open-source platform intended for building electronics projects.
Arduino comprises of both a physical programmable circuit board (often referred
to as a microcontroller) and a piece of software, or Integrated Development Environment (IDE) that runs on your computer, used to write and upload computer code
to the physical board.
• In the picture above, the USB connection is labelled (1) and the barrel jack is
labelled (2).
• NOTE: Do not use a power supply greater than 20 V as you will overpower
(and thereby destroy) your Arduino. The recommended voltage for most Arduino
models is between 6 and 12 V.
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