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, link at the bottom.
bmp180 module
Wiring and layout
Make the following connections
GND <-> GND
3V3 <-> VIN (or 3Vo)
P19 <-> SCL
P20 <-> SDA
Here is a layout drawn in fritzing
microbit and bmp180
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
[codesyntax lang=”cpp”]
#include <Wire.h>
#include <Adafruit_BMP085.h>
Adafruit_BMP085 bmp;
void setup()
{
Serial.begin(9600);
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);
}
[/codesyntax]
Output
Open the Serial monitor and you should see something like this
Temperature = 20.10 Celsius
Pressure = 100775 Pascal
Temperature = 20.00 Celsius
Pressure = 100773 Pascal
Temperature = 19.90 Celsius
Pressure = 100778 Pascal
Temperature = 25.80 Celsius
Pressure = 100835 Pascal