The last component to add is a LED which indicates the running status of the device. It will pulse lightly when the device is monitoring but blink when the alarm is on.

Based on the designed functions, it should include:

• A Particle Photon microcontroller
• A breadboard to hold the components
• A LED to indicate the running status
• A flame sensor to detect fire
• A buzzer to notify user
• A small push button for user to check the situation and reset the device
• A 1kΩ resistor to stabilize the LED light

Besides, to notify the user remotely, IFTTT is used so that user can get a text message when the device detects a fire.