micro:bit and bmp180 sensor example
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.
Wiring and layout
Make the following connections
GND <-> GND
3V3 <-> VIN (or 3Vo)
P19 <-> SCL
P20 <-> SDA
Here is a layout drawn in fritzing
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
