Arduino Sketch Help BPM180 and LCD output



  • Hi all !
    I am new to this Arduino thing and i have an arduino nano ( fake Robodyn V3 Atmega 168) .. Its working well so far. I am sorry if this is posted in the wrong place , please correct me :)

    I have a sketch for the BMP180 pressure sensor to give me a lot of data on the serial port.
    I also have a 1602A V 2.0 Display and i soldered a module to it ( i believe LCM1602) so that i can hook up the display by only 4 wires. I would like to have the data from the Pressure Sensor display on the LCD. ( i only would like to have the pressure show up , no need for temp and all the other), The refresh rate on the display I would like to see as accurate ( fast ) as possible. .
    Could someone please let me know how i can accomplish it ? And where do i have to attach the 4 Cables from the LCD ( SCL SDA VCC GND ) because the pressure sensor is using the spots... :)

    Attached is the example sketch of the pressure sensor... ( i have the librarys loaded and it is working ) ...

    Thank you !

    /* SFE_BMP180 library example sketch

    This sketch shows how to use the SFE_BMP180 library to read the
    Bosch BMP180 barometric pressure sensor.
    https://www.sparkfun.com/products/11824

    Like most pressure sensors, the BMP180 measures absolute pressure.
    This is the actual ambient pressure seen by the device, which will
    vary with both altitude and weather.

    Before taking a pressure reading you must take a temparture reading.
    This is done with startTemperature() and getTemperature().
    The result is in degrees C.

    Once you have a temperature reading, you can take a pressure reading.
    This is done with startPressure() and getPressure().
    The result is in millibar (mb) aka hectopascals (hPa).

    If you'll be monitoring weather patterns, you will probably want to
    remove the effects of altitude. This will produce readings that can
    be compared to the published pressure readings from other locations.
    To do this, use the sealevel() function. You will need to provide
    the known altitude at which the pressure was measured.

    If you want to measure altitude, you will need to know the pressure
    at a baseline altitude. This can be average sealevel pressure, or
    a previous pressure reading at your altitude, in which case
    subsequent altitude readings will be + or - the initial baseline.
    This is done with the altitude() function.

    Hardware connections:

    • (GND) to GND
    • (VDD) to 3.3V

    (WARNING: do not connect + to 5V or the sensor will be damaged!)

    You will also need to connect the I2C pins (SCL and SDA) to your
    Arduino. The pins are different on different Arduinos:

    Any Arduino pins labeled: SDA SCL
    Uno, Redboard, Pro: A4 A5
    Mega2560, Due: 20 21
    Leonardo: 2 3

    Leave the IO (VDDIO) pin unconnected. This pin is for connecting
    the BMP180 to systems with lower logic levels such as 1.8V

    Have fun! -Your friends at SparkFun.

    The SFE_BMP180 library uses floating-point equations developed by the
    Weather Station Data Logger project: http://wmrx00.sourceforge.net/

    Our example code uses the "beerware" license. You can do anything
    you like with this code. No really, anything. If you find it useful,
    buy me a beer someday.

    V10 Mike Grusin, SparkFun Electronics 10/24/2013
    V1.1.2 Updates for Arduino 1.6.4 5/2015
    */

    // Your sketch must #include this library, and the Wire library.
    // (Wire is a standard library included with Arduino.):

    #include <SFE_BMP180.h>
    #include <Wire.h>

    // You will need to create an SFE_BMP180 object, here called "pressure":

    SFE_BMP180 pressure;

    #define ALTITUDE 1655.0 // Altitude of SparkFun's HQ in Boulder, CO. in meters

    void setup()
    {
    Serial.begin(9600);
    Serial.println("REBOOT");

    // Initialize the sensor (it is important to get calibration values stored on the device).

    if (pressure.begin())
    Serial.println("BMP180 init success");
    else
    {
    // Oops, something went wrong, this is usually a connection problem,
    // see the comments at the top of this sketch for the proper connections.

    Serial.println("BMP180 init fail\n\n");
    while(1); // Pause forever.
    

    }
    }

    void loop()
    {
    char status;
    double T,P,p0,a;

    // Loop here getting pressure readings every 10 seconds.

    // If you want sea-level-compensated pressure, as used in weather reports,
    // you will need to know the altitude at which your measurements are taken.
    // We're using a constant called ALTITUDE in this sketch:

    Serial.println();
    Serial.print("provided altitude: ");
    Serial.print(ALTITUDE,0);
    Serial.print(" meters, ");
    Serial.print(ALTITUDE*3.28084,0);
    Serial.println(" feet");

    // If you want to measure altitude, and not pressure, you will instead need
    // to provide a known baseline pressure. This is shown at the end of the sketch.

    // You must first get a temperature measurement to perform a pressure reading.

    // Start a temperature measurement:
    // If request is successful, the number of ms to wait is returned.
    // If request is unsuccessful, 0 is returned.

    status = pressure.startTemperature();
    if (status != 0)
    {
    // Wait for the measurement to complete:
    delay(status);

    // Retrieve the completed temperature measurement:
    // Note that the measurement is stored in the variable T.
    // Function returns 1 if successful, 0 if failure.
    
    status = pressure.getTemperature(T);
    if (status != 0)
    {
      // Print out the measurement:
      Serial.print("temperature: ");
      Serial.print(T,2);
      Serial.print(" deg C, ");
      Serial.print((9.0/5.0)*T+32.0,2);
      Serial.println(" deg F");
      
      // Start a pressure measurement:
      // The parameter is the oversampling setting, from 0 to 3 (highest res, longest wait).
      // If request is successful, the number of ms to wait is returned.
      // If request is unsuccessful, 0 is returned.
    
      status = pressure.startPressure(3);
      if (status != 0)
      {
        // Wait for the measurement to complete:
        delay(status);
    
        // Retrieve the completed pressure measurement:
        // Note that the measurement is stored in the variable P.
        // Note also that the function requires the previous temperature measurement (T).
        // (If temperature is stable, you can do one temperature measurement for a number of pressure measurements.)
        // Function returns 1 if successful, 0 if failure.
    
        status = pressure.getPressure(P,T);
        if (status != 0)
        {
          // Print out the measurement:
          Serial.print("absolute pressure: ");
          Serial.print(P,2);
          Serial.print(" mb, ");
          Serial.print(P*0.0295333727,2);
          Serial.println(" inHg");
    
          // The pressure sensor returns abolute pressure, which varies with altitude.
          // To remove the effects of altitude, use the sealevel function and your current altitude.
          // This number is commonly used in weather reports.
          // Parameters: P = absolute pressure in mb, ALTITUDE = current altitude in m.
          // Result: p0 = sea-level compensated pressure in mb
    
          p0 = pressure.sealevel(P,ALTITUDE); // we're at 1655 meters (Boulder, CO)
          Serial.print("relative (sea-level) pressure: ");
          Serial.print(p0,2);
          Serial.print(" mb, ");
          Serial.print(p0*0.0295333727,2);
          Serial.println(" inHg");
    
          // On the other hand, if you want to determine your altitude from the pressure reading,
          // use the altitude function along with a baseline pressure (sea-level or other).
          // Parameters: P = absolute pressure in mb, p0 = baseline pressure in mb.
          // Result: a = altitude in m.
    
          a = pressure.altitude(P,p0);
          Serial.print("computed altitude: ");
          Serial.print(a,0);
          Serial.print(" meters, ");
          Serial.print(a*3.28084,0);
          Serial.println(" feet");
        }
        else Serial.println("error retrieving pressure measurement\n");
      }
      else Serial.println("error starting pressure measurement\n");
    }
    else Serial.println("error retrieving temperature measurement\n");
    

    }
    else Serial.println("error starting temperature measurement\n");

    delay(100); // Pause for 5 seconds.
    }


  • Admin

    Please update post format source code using the </> button in the composer.

    Yes, it is possible to accomplish. But you'll probably have to try to create something to start with. And this isn't really a MySensors project you know ;)



  • @hek Thank you Hek ,.. how do i do that please ?

    :) my username is microwhatt and my password is -----

    can u please correct it for me ?
    Thanks


  • Admin

    Don't post your password on the forum!

    Press the "..." button to the right and select "Edit"



  • Schade ich kann es nicht finden ... :(



  • @hek Sorry I cannot find it ... Where is it located please ? Thanks !


  • Hero Member



  • HAHAHA Thank you ! :)


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