BMP180 - Measure temperature and pressure

The BMP180 is a temperature and pressure sensors using the I2C-protocol for communication.

Library

To use the BMP180, import the library bmp180

import bmp180

Function Reference

Open Device

Open()
Open(interface)
Open(interface, address)

Open the BMP180 on interface interface with I2C address address.

• interface
  • String
  • Path to I2C-Interface.
  • Optional parameter. Default value is "/dev/i2c-1"
• address
  • Integer: 0 … 255
  • Device address
  • Optional parameter. Default value is 0x77.

Example:

Open("/dev/i2c-1", 0x77)

Measure

M = StartMeasurement()

Measure temperature and pressure.

• M
  • 1d-array with two real values
  • M[0]: Temperature in °C
  • M[1]: Pressure in Pascal

Close device

Close()

Close the BMP180 device.

Example

For running this example, you need a BMP180. SmallBASIC PiGPIO 2 is using the I2C-protocol for communication. The Raspberry Pi supports this protocol in hardware, but by default the protocol is disabled. Therefore you have to setup I2C as described here.

In the next step please wire the sensor as shown in the following image.

The I2C bus is using pin 2 (SDA1) and 3 (SCL1). The sensor can be driven with a voltage of 3.3V.

import bmp180

bmp180.open("/dev/i2c-1", 0x77)

delay(500)

for ii = 1 to 50
  M = bmp180.StartMeasurement()

  locate 5,0
  print "T: "; M[0]; "  P: "; M[1]

  delay(500)
next