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Please explain how the smart home system circuit design below is connected and designed. The smart home will be able to automatic on/off light through motion sensor, automatic on/off fan after reaching 27 degree, send email when detect smoke. The bulb was changed into a LED which is connected directly to the relay instead of parallel with the fan.PIR MQ-2 ESP8266 DHT22 13S Arduino LCD Karakter 16x2 AC Socket fritzing

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Answer #1

Motion sensor PIR is connected to digital input D4.
DHT22 is connected at digital input D5.
Smoke sensor MQ-2 is connected to analog input A3

All the three sensors are connected to common ground with required supply of 3.3V or 5V from the power section.
LCM1602 is the LCD driver and is connected at Analog inputs for its operation along with the supply and ground.

on activation of the motion sensor and temperature above 27 degrees, corresponding signals are generated on digital pins 2 and 3.
on detection of smoke, an email will be sent.

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