Arduino project · Fire, gas and safety · Medium
Fire and Gas Alarm Panel
A panel watches for flame and gas, shows the gas level and sounds the alarm. A teaching model only.
What you will learn
- How two sensors give one alarm
- How a panel shows status
- Why real alarms must be certified
How it works
Flame or high gas will start the buzzer and the red LED. The LCD shows the gas level.
Try this next
- Add a latch.
- Add a fan relay.
- Add a siren tone.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A fire alarm panel
Switch the flame sensor on. A fire appears in the room and the alarm rings.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Flame sensor = the fire in the room
- Buzzer = the alarm
- Red LED = the warning beacon