If you are familiar with BMP180 it's a Pressure / temperature sensor pins: A5,A4.
I've been using lately BMP180 with the BMP085 library, here is the code:
BMP085 Lib Code:
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
/* This driver uses the Adafruit unified sensor library (Adafruit_Sensor),
which provides a common 'type' for sensor data and some helper functions.
To use this driver you will also need to download the Adafruit_Sensor
library and include it in your libraries folder.
You should also assign a unique ID to this sensor for use with
the Adafruit Sensor API so that you can identify this particular
sensor in any data logs, etc. To assign a unique ID, simply
provide an appropriate value in the constructor below (12345
is used by default in this example).
Connections
===========
Connect SCL to analog 5
Connect SDA to analog 4
Connect VDD to 3.3V DC
Connect GROUND to common ground
History
=======
2013/JUN/17 - Updated altitude calculations (KTOWN)
2013/FEB/13 - First version (KTOWN)
*/
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
/**************************************************************************/
/*
Displays some basic information on this sensor from the unified
sensor API sensor_t type (see Adafruit_Sensor for more information)
*/
/**************************************************************************/
void displaySensorDetails(void)
{
sensor_t sensor;
bmp.getSensor(&sensor);
Serial.println("------------------------------------");
Serial.print ("Sensor: "); Serial.println(sensor.name);
Serial.print ("Driver Ver: "); Serial.println(sensor.version);
Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println(" hPa");
Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println(" hPa");
Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println(" hPa");
Serial.println("------------------------------------");
Serial.println("");
delay(500);
}
/**************************************************************************/
/*
Arduino setup function (automatically called at startup)
*/
/**************************************************************************/
void setup(void)
{
Serial.begin(9600);
Serial.println("Pressure Sensor Test"); Serial.println("");
/* Initialise the sensor */
if(!bmp.begin())
{
/* There was a problem detecting the BMP085 ... check your connections */
Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
while(1);
}
/* Display some basic information on this sensor */
displaySensorDetails();
}
/**************************************************************************/
/*
Arduino loop function, called once 'setup' is complete (your own code
should go here)
*/
/**************************************************************************/
void loop(void)
{
/* Get a new sensor event */
sensors_event_t event;
bmp.getEvent(&event);
/* Display the results (barometric pressure is measure in hPa) */
if (event.pressure)
{
/* Display atmospheric pressue in hPa */
Serial.print("Pressure: ");
Serial.print(event.pressure);
Serial.println(" hPa");
/* Calculating altitude with reasonable accuracy requires pressure *
* sea level pressure for your position at the moment the data is *
* converted, as well as the ambient temperature in degress *
* celcius. If you don't have these values, a 'generic' value of *
* 1013.25 hPa can be used (defined as SENSORS_PRESSURE_SEALEVELHPA *
* in sensors.h), but this isn't ideal and will give variable *
* results from one day to the next. *
* *
* You can usually find the current SLP value by looking at weather *
* websites or from environmental information centers near any major *
* airport. *
* *
* For example, for Paris, France you can check the current mean *
* pressure and sea level at: http://bit.ly/16Au8ol */
/* First we get the current temperature from the BMP085 */
float temperature;
bmp.getTemperature(&temperature);
Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println(" C");
/* Then convert the atmospheric pressure, and SLP to altitude */
/* Update this next line with the current SLP for better results */
float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
Serial.print("Altitude: ");
Serial.print(bmp.pressureToAltitude(seaLevelPressure,
event.pressure));
Serial.println(" m");
Serial.println("");
}
else
{
Serial.println("Sensor error");
}
delay(1000);
}
Here is the same code but without the extra stuffs that I don't need:
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
void setup(){
Serial.begin(9600);
if(!bmp.begin())
{
Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
while(1);
}
}
void loop(){
sensors_event_t event;
bmp.getEvent(&event);
if (event.pressure)
{
Serial.print("Pressure: ");
Serial.print(event.pressure);
Serial.println(" hPa");
float temperature;
bmp.getTemperature(&temperature);
Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println(" C");
float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
Serial.print("Altitude: ");
Serial.print(bmp.pressureToAltitude(seaLevelPressure,
event.pressure));
Serial.println(" m");
Serial.println("");
}
delay(1000);
}
What's my problem?
If you look in the SETUP you will see
if(!bmp.begin())
{
Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
while(1);
}
The problem is this lines of code, without them the BMP is not working so you need to keep this
but if you use extra components on your arduino like other I2C sensors or simple sensors or motors or anything else and you have this code without using (unplug) the BMP, the bmp.begin() sees that the sensor is not plugged and stops everything.
What I mean it stops everything? nothing is running, it's like freezing all the chip, all the code.
Are you familiar with BMP180/code is there something to do about that?
about that specific line of code
made me look like a noob, facepalm