The BMP180 is an integrated sensor that measures both atmospheric pressure and temperature at once, allowing an approximate altitude calculation based on the pressure reading — a use case that goes beyond simple temperature sensors like the LM35.
Components needed
An Arduino board, a BMP180 sensor module, and connecting wires.
Wiring it up
The module connects via the I2C protocol using just two wires: SDA for data and SCL for clock, with the pin numbers varying by Arduino board (A4 and A5 on the Uno, pins 20 and 21 on the Mega), at a fixed I2C address of 0x77. The module includes an onboard 3.3V regulator that lets it connect directly to a 5V Arduino board with no extra level-shifting circuit needed.
How it works
The module measures atmospheric pressure across a 300 to 1100 hPa range (roughly equivalent to altitudes from -500 to +9000 meters above sea level), and temperature across a -40°C to +85°C range with roughly ±1°C accuracy. The sensor draws under 1mA during measurement and drops to about 5µA in idle mode, making it power-efficient for battery-powered projects. The code typically displays temperature, pressure, and calculated altitude readings, along with the option to correct pressure for sea level, over the serial monitor.
You can find the BMP180 sensor module at Juthour Tech.
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