🌡️ Interfacing BMP180 Pressure & Temperature Sensor with Raspberry Pi 3

🔹 Overview

The BMP180 is a sensor that measures atmospheric pressure and temperature. It is commonly used in weather stations, altitude measurement, and IoT projects. In this tutorial, we will interface the BMP180 sensor with Raspberry Pi 3 and display the readings.

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🛠️ Components Required

✔️ Raspberry Pi 3
✔️ BMP180 Sensor
✔️ Breadboard & Jumper Wires

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🔌 Circuit Diagram

The BMP180 communicates with the Raspberry Pi using the I2C protocol.

🔗 BMP180 to Raspberry Pi Connections   

BMP180 Pin	Connection
VCC	3.3V (Raspberry Pi)
GND	GND
SDA	GPIO 2 (I2C SDA)
SCL	GPIO 3 (I2C SCL)

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📜 Python Code to Read BMP180 Sensor

Save the following Python script as bmp180_sensor.py and run it on Raspberry Pi.

python
import smbus
import time

# BMP180 Default Address
BMP180_ADDR = 0x77

# Open I2C bus
bus = smbus.SMBus(1)

def read_temperature():
    bus.write_byte_data(BMP180_ADDR, 0xF4, 0x2E)
    time.sleep(0.005)
    temp_msb = bus.read_byte_data(BMP180_ADDR, 0xF6)
    temp_lsb = bus.read_byte_data(BMP180_ADDR, 0xF7)
    temp = ((temp_msb << 8) + temp_lsb) / 340.0 + 36.53
    return round(temp, 2)

try:
    while True:
        temperature = read_temperature()
        print("Temperature:", temperature, "°C")
        time.sleep(2)
except KeyboardInterrupt:
    print("\nProgram stopped.")

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💡 How It Works

1. The BMP180 sensor uses the I2C protocol to communicate with the Raspberry Pi.
2. The Python script sends commands to the sensor and reads the temperature values.
3. The sensor returns the temperature data, which is displayed on the screen.

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🎯 Applications

✅ Weather stations
✅ Altitude measurement
✅ IoT-based climate monitoring

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📝 मराठीत समजावणी (Marathi Explanation)

🔹 परिचय

BMP180 सेन्सर हा हवामानाचा दाब (Pressure) आणि तापमान (Temperature) मोजण्यासाठी वापरला जातो. याचा उपयोग हवामान केंद्रे, IoT प्रकल्प आणि उंची मोजण्यासाठी केला जातो.

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🛠️ आवश्यक घटक

✔️ रास्पबेरी पाय ३
✔️ BMP180 सेन्सर
✔️ ब्रेडबोर्ड आणि जम्पर वायर

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🔌 सर्किट कनेक्शन

BMP180 सेन्सर I2C प्रोटोकॉल वापरतो.

BMP180 पिन	रास्पबेरी पाय कनेक्शन
VCC	3.3V
GND	GND
SDA	GPIO 2 (I2C SDA)
SCL	GPIO 3 (I2C SCL)

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📜 पायथॉन कोड

हा कोड bmp180_sensor.py नावाने सेव्ह करा आणि चालवा.

python
import smbus
import time

BMP180_ADDR = 0x77
bus = smbus.SMBus(1)

def read_temperature():
    bus.write_byte_data(BMP180_ADDR, 0xF4, 0x2E)
    time.sleep(0.005)
    temp_msb = bus.read_byte_data(BMP180_ADDR, 0xF6)
    temp_lsb = bus.read_byte_data(BMP180_ADDR, 0xF7)
    temp = ((temp_msb << 8) + temp_lsb) / 340.0 + 36.53
    return round(temp, 2)

try:
    while True:
        temperature = read_temperature()
        print("तापमान:", temperature, "°C")
        time.sleep(2)
except KeyboardInterrupt:
    print("\nप्रोग्रॅम थांबला.")

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💡 हे कसे कार्य करते?

1. BMP180 सेन्सर I2C प्रोटोकॉल वापरून रास्पबेरी पायशी संवाद साधतो.
2. पायथॉन कोड सेन्सरला कमांड पाठवतो आणि तापमान वाचतो.
3. सेन्सर डेटा स्क्रीनवर प्रदर्शित करतो.

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🎯 उपयोग

✅ हवामान केंद्रे
✅ उंची मोजणी (Altitude Measurement)
✅ IoT-आधारित तापमान निरीक्षण