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Lesson 03: Flame Sensor Module

In this lesson, you will learn how to use the Raspberry Pi Pico W to detect fire using a flame sensor. When the sensor detects a flame, the onboard LED of the Raspberry Pi Pico W will turn on and display a message indicating fire detection. If no fire is detected, the LED remains off and shows a different message. This project introduces working with external sensors and provides practical experience in handling digital inputs and outputs on the Raspberry Pi Pico W using MicroPython.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Raspberry Pi Pico W	BUY
Flame Sensor Module	BUY
Breadboard	BUY

Wiring

../_images/Lesson_03_flame_module_circuit_bb.png

Code

from machine import Pin
import time

# Set GPIO 16 as an input pin to read the flame sensor state
flame_sensor = Pin(16, Pin.IN)

# Initialize the onboard LED of the Raspberry Pi Pico W
led = Pin("LED", Pin.OUT)

while True:
    if flame_sensor.value() == 0:
        led.value(1)  # Turn on the LED
        print("** Fire detected!!! **")
    else:
        led.value(0)  # Turn off the LED
        print("No Fire detected")

    time.sleep(0.1)  # Short delay to reduce CPU usage

Code Analysis

Importing Required Modules

This part of the code imports necessary modules. machine is used for interacting with GPIO pins, and time provides functionality for delays.
```
from machine import Pin
import time
```
Initializing the Flame Sensor and LED

Sets up the flame sensor and onboard LED. Pin 16 is configured as an input to read the flame sensor, and the onboard LED is set as an output.
```
flame_sensor = Pin(16, Pin.IN)
led = Pin("LED", Pin.OUT)
```
The Main Loop
- An infinite loop checks the state of the flame sensor. If the sensor detects a flame (value 0), it turns on the LED and prints a message. Otherwise, it turns off the LED and prints a different message.
- A delay of 0.1 seconds reduces CPU usage.
```
while True:
    if flame_sensor.value() == 0:
        led.value(1)
        print("** Fire detected!!! **")
    else:
        led.value(0)
        print("No Fire detected")
    time.sleep(0.1)
```