Circuit Documentation

Summary

This circuit is designed to monitor environmental conditions and respond to specific events such as the presence of a flame, a magnetic field, or sound. It utilizes a Raspberry Pi Pico W as the central microcontroller to process inputs from a flame sensor, a microphone module, a hall sensor, and to control a buzzer module as an output. The Raspberry Pi Pico W is also responsible for connecting to Wi-Fi and sending notifications via the Pushbullet API.

Component List

KY-026 Flame Sensor

• Description: A sensor module designed to detect flames or fire.
• Pins: AO (Analog Output), GND (Ground), VCC (Power Supply), DO (Digital Output).

Buzzer Module

• Description: An electronic buzzer for audible alerts.
• Pins: GND (Ground), Vcc (Power Supply), I/O (Input/Output).

Raspberry Pi Pico W

• Description: A microcontroller board with Wi-Fi capabilities.
• Pins: VBUS, VSYS, GP16-GP22, RUN, GP26-GP28, ADC_VREF, 3V3 OUT, 3V3_EN, GP0-GP15.

KY-037 Microphone

• Description: A microphone module with both analog and digital outputs.
• Pins: Analog output, Ground, VCC, Digital output.

Hall Sensor

• Description: A sensor that detects magnetic fields.
• Pins: -, +, S (Signal).

Wiring Details

KY-026 Flame Sensor

• VCC: Connected to the power supply net.
• GND: Connected to the ground net.
• DO: Connected to GP17 on the Raspberry Pi Pico W.

Buzzer Module

• Vcc: Connected to the power supply net.
• GND: Connected to the ground net.
• I/O: Connected to GP16 on the Raspberry Pi Pico W.

Raspberry Pi Pico W

• VBUS: Connected to the power supply net.
• GND: Connected to the ground net.
• GP16: Connected to the I/O of the Buzzer Module.
• GP17: Connected to the DO of the KY-026 Flame Sensor.
• GP18: Connected to the S of the Hall Sensor.
• GP26: Connected to the Analog output of the KY-037 Microphone.

KY-037 Microphone

• VCC: Connected to the power supply net.
• Ground: Connected to the ground net.
• Analog output: Connected to GP26 on the Raspberry Pi Pico W.

Hall Sensor

• +: Connected to the power supply net.
• -: Connected to the ground net.
• S: Connected to GP18 on the Raspberry Pi Pico W.

Documented Code

import network
import urequests
import time
from machine import Pin

# Wi-Fi credentials
SSID = 'Redmi Note 13'
PASSWORD = 'adam1234'

# Pushbullet API key
PUSHBULLET_API_KEY = 'o.WWpAnnZrgeeKGetvwP6YniVbcAMpuOgc'

# Initialize the flame sensor pin (assuming D0 is connected to GP15)
flame_sensor = Pin(17, Pin.IN)
buzzer_pin = machine.Pin(16, machine.Pin.OUT)
contact_sensor_pin = machine.Pin(18, machine.Pin.IN)
sound_pin = machine.ADC(26)
uart = machine.UART(0, baudrate=9600, tx=0, rx=1)

# Function to connect to Wi-Fi
def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(SSID, PASSWORD)
    
    while not wlan.isconnected():
        time.sleep(1)
    
    print('Connected to Wi-Fi')
    print('IP Address:', wlan.ifconfig()[0])

# Function to send a Pushbullet notification
def send_push_notification(title, message):
    url = 'https://api.pushbullet.com/v2/pushes'
    headers = {
        'Authorization': f'Bearer {PUSHBULLET_API_KEY}',
        'Content-Type': 'application/json'
    }
    payload = {
        'type': 'note',
        'title': title,
        'body': message
    }
    
    response = urequests.post(url, json=payload, headers=headers)
    
    if response.status_code == 200:
        print('Notification sent successfully')
    else:
        print('Failed to send notification', response.status_code)

def check_pushbullet():
    url = f"https://api.pushbullet.com/v2/pushes"
    headers = {
        "Access-Token": "o.WWpAnnZrgeeKGetvwP6YniVbcAMpuOgc"
    }

    response = urequests.get(url, headers=headers)
    
    while (response.status_code == 200) :
        pushes = response.json().get("pushes", [])
        if pushes:
            latest_push = pushes[0]  # Get the most recent push
            title = latest_push.get("title")
            body = latest_push.get("body")
            print("Received push notification:", title, body)
        time.sleep(10)
        if body == "aa":
                send_push_notification('Entry verified!', '')
                buzzer_pin.value(0)
                break
        else :
            send_push_notification('No verification has been made!', 'A intruder has entered the hause, check immediately')
            while True:
                    for i in range (10):
                        buzzer_pin.value(1)
                        time.sleep(0.1)
                        buzzer_pin.value(0) 
                        time.sleep(0.2)
                    break
            break
            
    else:
        print("Error fetching Pushbullet data")
 

# Main code
connect_wifi()

while True:
    sound_value = sound_pin.read_u16()
    if int(str(sound_value) + "\n")> 4000 :
        send_push_notification('Loud sound alert!', 'Check the area immediately!')
    time.sleep(0.1)
    if contact_sensor_pin.value() == 0:  # Check if flame is detected (value 1 means flame detected)
        print("Door opened!")
        send_push_notification('Door opened!', '')
        time.sleep(5)
        check_pushbullet()
        time.sleep(10)
    if flame_sensor.value() == 1:  # Check if flame is detected (value 1 means flame detected)
        print("Fire detected!")
        send_push_notification('Fire Alert', 'A fire has been detected. Check the area immediately!')
        while (flame_sensor.value() == 1) :
            buzzer_pin.value(1)
            time.sleep(0.3)
            buzzer_pin.value(0) 
            time.sleep(0.2)
    
    else:
        buzzer_pin.value(0)
        print("No fire detected")
    
    time.sleep(1)  # Check every 1 second

This code is designed to run on the Raspberry Pi Pico W microcontroller. It sets up Wi-Fi connectivity, monitors the connected sensors, and sends notifications based on sensor inputs. The buzzer is activated in response to certain conditions, such as the detection of a flame or an unauthorized entry.