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https://maker.pro/arduino/projects/iot-smoke-alarm-arduino-esp8266-gas-sensor

I'm a layman who wants to do this. Have completed it as shown in the link.

But I don't know how to see the website and not make red LED glow instead of green when I bring a matchstick close to the sensor.

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    The project has missed explaining how to get the ESP8266 module to connect to a WiFi AP. Have a look at the AT command AT+CWJAP here electronicshub.org/esp8266-at-commands
    – MatsK
    Sep 19 '18 at 16:33
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    And, if that works, please ask @MatsK to post it as an answer, and accept it, to help others in future. You could also inform the website owners webmaster@makr.pro, so that they can update. It's all about helping others Sep 20 '18 at 9:28
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    Using a matchstick is not the best way to trigger a smoke alarm even though it might work (you do not want to trigger a smoke alarm if you light a candle in the room - even if the distance is larger). There are dedicated smoke detector test sprays available that allow for more reproducible results.
    – koalo
    Sep 20 '18 at 12:53
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esp8266_command("AT+CWMODE=2\r\n",1000,DEBUG); line set the esp8266 as acces point which means it itself start a hotspot to whom you have to connect other device. You should replace 2 by 1 to act in station mode so that you can connect to router.

esp8266_command("AT+CWJAP=”SSID”,”PASSWORD”\r\n",1000,DEBUG); command which is missing can be used to connect to router.

esp8266_command("AT+CIFSR\r\n",1000,DEBUG); prints your current local ip address. This ip is what you want to open the hosted website. Copy the ip and paste on chrome on connected computer. Remember the computer and esp must be connected to the same wifi network to work this.

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