This bmp180 from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. The BMP180 replaces the BMP085.
Specification
- Pressure sensing range: 300-1100 hPa (9000m to -500m above sea level)
- Up to 0.03hPa / 0.25m resolution
- -40 to +85°C operational range, +-2°C temperature accuracy
Here is a breakout which makes it easy to use the sensor. The sensor will cost less than $2.
Layout
Code
You will need the Adafruit BMP085 library for this example, you can either download it or use the library manager in newer Arduino IDEs.
https://github.com/adafruit/Adafruit-BMP085-Library
In this example I am only looking at the temperature and pressure but there are other functions in the library
#include <Wire.h>
#include <Adafruit_BMP085.h>
Adafruit_BMP085 bmp;
void setup()
{
Serial.begin(9600);
//Wire.begin (4, 5);
if (!bmp.begin())
{
Serial.println("Could not find BMP180 or BMP085 sensor at 0x77");
while (1) {}
}
}
void loop()
{
Serial.print("Temperature = ");
Serial.print(bmp.readTemperature());
Serial.println(" Celsius");
Serial.print("Pressure = ");
Serial.print(bmp.readPressure());
Serial.println(" Pascal");
Serial.println();
delay(5000);
}
Output
Open the Serial monitor and you should see something like this
Temperature = 19.70 Celsius
Pressure = 97855 Pascal
Temperature = 26.40 Celsius
Pressure = 97982 Pascal
Temperature = 29.20 Celsius
Pressure = 98099 Pascal
Temperature = 27.50 Celsius
Pressure = 97864 Pascal
Temperature = 26.10 Celsius
Pressure = 97865 Pascal
Temperature = 25.00 Celsius
Pressure = 97864 Pascal
