Arduino Barometer, Thermometer & Altimeter using ATmega328P with Proteus Simulation

Introduction

This microcontroller project demonstrates a simple barometer, thermometer, and altimeter using an Arduino (ATmega328P) and the Bosch BMP180 pressure sensor.
The system measures atmospheric pressure, temperature, and altitude and displays results via the serial monitor during Proteus simulation.
It’s a practical embedded systems example showing I2C sensor interfacing, real-time data acquisition, and environmental sensing.This Arduino BMP180 pressure sensor project demonstrates a simple barometer, thermometer, and altimeter using an ATmega328P with Proteus simulation. This project is ideal for learning DIY electronics, sensor integration, and simulation-based testing before real hardware deployment.

How the Project Works (Overview)

The ATmega328P communicates with the BMP180 pressure transducer over the I2C bus using Arduino AVR libraries.
The sensor continuously provides pressure data, from which temperature and altitude are calculated.
All values are processed by the microcontroller and sent to a serial terminal for monitoring in Proteus.

Block Diagram / Workflow Explanation

1. BMP180 Sensor measures atmospheric pressure and temperature

2. I2C Communication (SDA/SCL) transfers data to ATmega328P

3. Arduino Firmware processes raw sensor data

4. Altitude Calculation uses sea-level pressure reference

5. Serial Output displays pressure, temperature, and altitude

Key Features

• Real-time pressure, temperature, and altitude measurement

• I2C-based sensor communication

• Unified sensor driver architecture

• Serial monitoring in Proteus simulation

• Works as barometer, thermometer, and altimeter

• Simple and clean firmware structure

Components Used

• ATmega328P (Arduino platform)

• Bosch BMP180 Pressure Transducer

• I2C interface (SDA, SCL)

• 3.3V power supply for sensor

• Virtual Serial Terminal (Proteus)

Applications

• Weather monitoring systems

• Altitude measurement devices

• Environmental data logging

• Educational embedded systems labs

• DIY electronics and sensor projects

Explanation of Code (High-Level)

The firmware uses the Adafruit BMP085 Unified Sensor Library to simplify sensor handling.

• Wire Library: Manages I2C communication

• Sensor Initialization: Verifies BMP180 presence

• Sensor Metadata Display: Outputs sensor capabilities

• Main Loop:

  • Reads pressure data

  • Reads temperature

  • Converts pressure to altitude using sea-level pressure

  • Sends formatted results to serial output

No low-level register handling is required, making the project beginner-friendly and portable.

Source Code

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{
  sensor_t sensor;
  bmp.getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" hPa");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" hPa");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" hPa");  
  Serial.println("------------------------------------");
  Serial.println("");
  delay(500);
}

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Proteus Simulation

In Proteus, the BMP180 sensor communicates with the ATmega328P via I2C.
A virtual serial terminal displays pressure (hPa), temperature (°C), and altitude (meters) updating every second.
The simulation behaves like real hardware, making it useful for testing firmware logic safely.

FAQs

Conclusion

This Arduino BMP180 project is a solid embedded systems learning example combining sensor interfacing, data processing, and Proteus simulation.
It’s simple, practical, and easily expandable—perfect for students and hobbyists exploring microcontroller projects and environmental sensing.This Arduino BMP180 pressure sensor project is a practical way to learn sensor interfacing and environmental monitoring in embedded systems.

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Arduino Barometer, Thermometer & Altimeter using ATmega328P with Proteus Simulation

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