Interfacing CO₂ Sensor with Raspberry Pi 3 🌫️

🎯 Objective

To measure carbon dioxide (CO₂) levels using a CO₂ sensor (like MG-811 or MH-Z19) with Raspberry Pi 3 for air quality monitoring.

🧰 Components Required

Component	Quantity
Raspberry Pi 3	1
CO₂ Sensor (MG-811 or MH-Z19)	1
Level Shifter / Logic Converter	1 (for UART sensors)
Jumper Wires	As required
Breadboard	1

⚡ Circuit Connections

For MH-Z19 CO₂ sensor (using UART):

MH-Z19 Pin	Connect To
VCC	5V (RPi Pin 2)
GND	GND (RPi Pin 6)
TX	GPIO15 (RX, Pin 10) via level shifter
RX	GPIO14 (TX, Pin 8) via level shifter

🧠 Python Code

import serial
import time

ser = serial.Serial("/dev/serial0", baudrate=9600, timeout=1)

def read_co2():
    ser.write(b"\xFF\x01\x86\x00\x00\x00\x00\x00\x79")
    response = ser.read(9)
    if len(response) == 9:
        high = response[2]
        low = response[3]
        co2 = (high << 8) + low
        return co2
    else:
        return None

try:
    while True:
        co2_level = read_co2()
        if co2_level:
            print("🌫️ CO₂ Concentration: {} ppm".format(co2_level))
        else:
            print("Sensor error!")
        time.sleep(2)

except KeyboardInterrupt:
    ser.close()

📊 Output

• Displays CO₂ concentration in ppm (parts per million).
• Can be used for real-time air quality monitoring.

💡 Applications

• Indoor air quality monitoring
• Smart home environment control
• Greenhouse management

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🎯 उद्दिष्ट

CO₂ सेन्सर वापरून हवेमधील कार्बन डायऑक्साईडची पातळी मोजणे आणि Raspberry Pi 3 वर डेटा वाचणे.

🧰 लागणारे साहित्य

घटक	संख्या
Raspberry Pi 3	1
CO₂ Sensor (MG-811 किंवा MH-Z19)	1
Level Shifter / Logic Converter	1
जंपर वायर	गरजेनुसार
ब्रेडबोर्ड	1

⚡ सर्किट कनेक्शन

MH-Z19 (UART) सेन्सरसाठी:

MH-Z19 पिन	जोडणी
VCC	5V
GND	GND
TX	GPIO15 (RX, लेव्हल शिफ्टरमार्फत)
RX	GPIO14 (TX, लेव्हल शिफ्टरमार्फत)

🧠 पाइथन कोड

import serial
import time

ser = serial.Serial("/dev/serial0", baudrate=9600, timeout=1)

def read_co2():
    ser.write(b"\xFF\x01\x86\x00\x00\x00\x00\x00\x79")
    response = ser.read(9)
    if len(response) == 9:
        high = response[2]
        low = response[3]
        co2 = (high << 8) + low
        return co2
    else:
        return None

try:
    while True:
        co2_level = read_co2()
        if co2_level:
            print("🌫️ CO₂ एकाग्रता: {} ppm".format(co2_level))
        else:
            print("सेन्सर त्रुटी!")
        time.sleep(2)

except KeyboardInterrupt:
    ser.close()

📊 आउटपुट

• ppm मध्ये CO₂ एकाग्रता दर्शवते.
• हवामानाचे निरीक्षण करण्यासाठी उपयुक्त.

💡 उपयोग

• घरातील हवेचा दर्जा तपासणे
• स्मार्ट होम वातावरण नियंत्रण
• ग्रीनहाउस व्यवस्थापन