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How do I add a Liquid Crystal Display to my current project

Former Member

Hello,

 

I recently completed, with some assistance from Coder27, Bill Abbot, Tony, and Mark Beckett the first part of my project ( http://www.element14.com/community/thread/23967?start=0&tstart=0 )

Now the second part - I am wanting to add a small 16 x 1 LCD to finish up my project (see coding below that I will be using)

I would like the LCD to simply show which direction a servo is pointing (as in degrees, such as 0°, 90°, 180°, 270°, or 360° or anywhere in between 0° to 360°)

Please be advised: I do know that arduino 1.0.4 has the LCD Scroll example, but I am sure I dont need the entire code they have.  Also, my LCD is only 16 x 1, not x 2.

Thanks,

~Anna

 

******** BEGINNING OF CODE *************

#include <Servo.h>

 

const int pan1 = 3;     // first servo

const int tilt1 = 5;    // second servo

const int pan2 = 9;     // third servo

const int tilt2 = 11;    // fourth servo

 

const int potpan1 = A0; // Joystick 1 Vertical signal

int val0;

const int pottilt1 = A1;   // Joystick 1 Horizontal signal

int val1;

const int potpan2 = A5;   // Joystick 1 Select signal

int val2;

const int pottilt2= A3;   // Joystick 2 Vertical signal

int val3;

 

int servoVal[4];        // variable to read the value from the analog pin

 

Servo mypan1;                                  // create servo object to control a servo

Servo mytilt1;    // create servo object to control a servo

Servo mypan2;                                  // create servo object to control a servo

Servo mytilt2;    // create servo object to control a servo

 

void setup()

{

 

  // Servo 

  mypan1.attach(pan1);  // attaches the servo

  mytilt1.attach(tilt1);  // attaches the servo

  mypan2.attach(pan2);  // attaches the servo

  mytilt2.attach(tilt2);  // attaches the servo

 

  // Inizialize Serial

  Serial.begin(57600);

}

 

void loop()

{

 

  outputPotentiometers();           // Read and output joystick values

 

  val0 = analogRead(potpan1);            // reads the value of the potentiometer (value between 0 and 1023)

  val0 = map(val0, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180)

  mypan1.write(val0);                  // sets the servo position according to the scaled value

 

  //Serial.print("Value of PWM 3:   ");

  //Serial.println(val0);

  //Serial.print("\t");

 

  val1 = analogRead(pottilt1);            // i added

  val1 = map(val1, 0, 1023, 0, 179);     // i added

  mytilt1.write(val1);                  // i added 

 

  //Serial.print("Value of PWM 5:   ");

  //Serial.println(val1);

  //Serial.print("\t");

 

  val2 = analogRead(potpan2);            // i added

  val2 = map(val2, 0, 1023, 0, 179);     // i added

  mypan2.write(val2);                  // i added

 

  //Serial.print("Value of PWM 6:   ");

  //Serial.println(val2);

  //Serial.print("\t");

 

 

  val3 = analogRead(pottilt2);            // i added

  val3 = map(val3, 0, 1023, 0, 179);     // i added

  mytilt2.write(val3);                  // i added

 

  delay(20);                                      

}

 

void outputPotentiometers()     // Display Joystick Values

{

  Serial.print("Pot Pan 1 on ~3:     ");

  Serial.print(analogRead(potpan1));

  Serial.print("\t");

  Serial.print("     Pot Tilt 1 on ~5:     ");

  Serial.print(analogRead(pottilt1));

  Serial.print("\t");

  Serial.print("     Pot Pan 2 on ~9:     ");

  Serial.print(analogRead(potpan2));

  Serial.print("\t");

  Serial.print("     Pot Tilt 2 on ~11:     ");

  Serial.println(analogRead(pottilt2));

  Serial.print("\t");

 

}

 

 

 

********** END OF CODE *************

Parents
  • 0

    updated code:

    // SparkFun Serial LCD example 2
    // Format and display fake RPM and temperature data

    // This sketch is for Arduino versions 1.0 and later
    // If you're using an Arduino version older than 1.0, use
    // the other example code available on the tutorial page.

    // Use the softwareserial library to create a new "soft" serial port
    // for the display. This prevents display corruption when uploading code.
    #include <SoftwareSerial.h>

    // Attach the serial display's RX line to digital pin 2
    SoftwareSerial mySerial(3,2); // pin 2 = TX, pin 3 = RX (unused)

    void setup()
    {
      mySerial.begin(9600); // set up serial port for 9600 baud
      delay(500); // wait for display to boot up

      mySerial.write(254); // cursor to beginning of first line
      mySerial.write(128);

      //mySerial.write("RPM:            "); // clear display + legends
      //mySerial.write("TEMP:           ");
      mySerial.write("T1:     P1:     "); // clear display + legends
      mySerial.write("T2:     P2:     ");
    }

    //int temp, rpm;
    //char tempstring[10], rpmstring[10]; // create string arrays
    int t1, p1, t2, p2;
    //char t1[8], p1[8], t2[8], p2[8]; // create string arrays
    char t1string[8];
    char p1string[8];
    char t2string[8];
    char p2string[8];
    ;

    void loop()
    {
      //temp = random(1000); // make some fake data
      //rpm = random(10000);
      t1 = random(1000); // make some fake data
      p1 = random(1000);
      t2 = random(1000); // make some fake data
      p2 = random(10000);

      //sprintf(tempstring,"%4d",rpm); // create strings from the numbers
      //sprintf(rpmstring,"%4d",temp); // right-justify to 4 spaces
      sprintf(t1string,"%4d",t1); // create strings from the numbers
      sprintf(p1string,"%4d",p1); // right-justify to 4 spaces
      sprintf(t2string,"%4d",t2); // create strings from the numbers
      sprintf(p2string,"%4d",p2); // right-justify to 4 spaces

      //mySerial.write(254); // cursor to 7th position on first line
      //mySerial.write(134);
      mySerial.write(254); // cursor to 7th position on first line
      mySerial.write(143);

      //mySerial.write(rpmstring); // write out the RPM value
      mySerial.write(t1); // write out the RPM value

      //mySerial.write(254); // cursor to 7th position on second line
      //mySerial.write(198);
      mySerial.write(254); // cursor to 7th position on second line
      mySerial.write(207);

      //mySerial.write(tempstring); // write out the TEMP value
      mySerial.write(p1); // write out the TEMP value
    // lines below have been added to accomidate t2 and p2
      //mySerial.write(254);
      //mySerial.write(134);
      mySerial.write(254); //
      mySerial.write(198);

      //mySerial.write(rpmstring); // write out the RPM value
      mySerial.write(t2); // write out the RPM value

      //mySerial.write(254); // cursor to 7th position on first line
      //mySerial.write(134);
      mySerial.write(254); // cursor to 7th position on first line
      mySerial.write(200);

      //mySerial.write(rpmstring); // write out the RPM value
      mySerial.write(p2); // write out the RPM value

      delay(1000); // short delay
    }

  • 0 in reply to Former Member

    Annasta

    I give up explaining....

     

    Try this then compare it to your original code and see what is different.

     

     

     

    {

      mySerial.begin(9600); // set up serial port for 9600 baud

      delay(500); // wait for display to boot up

     

      mySerial.write(254); // cursor to beginning of first line

      mySerial.write(128);

     

      mySerial.write("T1:     P1:     "); // clear display + legends

      mySerial.write("T2:     P2:     ");

    }

     

    int t1, p1, t2, p2;

     

    char t1string[8];

    char p1string[8];

    char t2string[8];

    char p2string[8];

     

    void loop()

    {

     

      t1 = 90;   //fixed value

      p1 = 45;   //fixed value

      t2 = 45;    //fixed value

      p2 = 180;   //fixed value

     

     

      sprintf(t1string,"%4d",t1); // create strings from the numbers

      sprintf(p1string,"%4d",p1); // right-justify to 4 spaces

      sprintf(t2string,"%4d",t2); // create strings from the numbers

      sprintf(p2string,"%4d",p2); // right-justify to 4 spaces

     

     

      mySerial.write(254); // cursor to 4th position on first line

      mySerial.write(131);

      mySerial.write(t1string); // write out the t1 value AFTER it was made into a string

     

      mySerial.write(254); // cursor to 11th position on first line

      mySerial.write(138);

      mySerial.write(p1string); // write out the p1 value AFTER it was made into a string

     

      mySerial.write(254); // cursor to 4th position on second line

      mySerial.write(195);

      mySerial.write(t2string); // write out the t2 value AFTER it was made into a string

     

      mySerial.write(254); // cursor to 11th position on second line

      mySerial.write(202);

      mySerial.write(p2string); // write out the p2 value AFTER it was made into a string

     

      delay(1000); // short delay

    }

     

     

    mark

  • 0 in reply to mcb1

    I just realized that there is a SerLCD library that might make life easier:

     

    http://playground.arduino.cc/Code/SerLCD

     

    The sample they include is a bit much, but you should be able to run the regular LiquidCrystal example with a minor modification like this:

     

    #include <serLCD.h>

     

    // Set pin to the LCD's rxPin

    int pin = 2;

     

    serLCD lcd(pin);

     

    void setup() {

     

      lcd.clear();

      // Print a message to the LCD.

      lcd.print("hello, world!");

    }

     

    void loop() {

    // set the cursor to column 0, line 1

      // (note: line 1 is the second row, since counting begins with 0):

      lcd.setCursor(0, 1);

      // print the number of seconds since reset:

      lcd.print(millis()/1000);

    }

     

     

    Then you could sprintf into String buffers, and do something like this:

     

      lcd.setCursor(0, 0);

      lcd.print("Top Line");

      lcd.setCursor(0, 1);

      lcd.print("Bottom Line");

     

    I'm sorry I don't have more time to be more detailed - sort of trying to help while getting my own work done!

     

    I recommend trying this as a new separate test sketch - don't change what you already have. That's in case it doesn't work as advertised, plus it also helps to get an understanding of things first.

     

    Cheers,

    -Nico

Reply
  • 0 in reply to mcb1

    I just realized that there is a SerLCD library that might make life easier:

     

    http://playground.arduino.cc/Code/SerLCD

     

    The sample they include is a bit much, but you should be able to run the regular LiquidCrystal example with a minor modification like this:

     

    #include <serLCD.h>

     

    // Set pin to the LCD's rxPin

    int pin = 2;

     

    serLCD lcd(pin);

     

    void setup() {

     

      lcd.clear();

      // Print a message to the LCD.

      lcd.print("hello, world!");

    }

     

    void loop() {

    // set the cursor to column 0, line 1

      // (note: line 1 is the second row, since counting begins with 0):

      lcd.setCursor(0, 1);

      // print the number of seconds since reset:

      lcd.print(millis()/1000);

    }

     

     

    Then you could sprintf into String buffers, and do something like this:

     

      lcd.setCursor(0, 0);

      lcd.print("Top Line");

      lcd.setCursor(0, 1);

      lcd.print("Bottom Line");

     

    I'm sorry I don't have more time to be more detailed - sort of trying to help while getting my own work done!

     

    I recommend trying this as a new separate test sketch - don't change what you already have. That's in case it doesn't work as advertised, plus it also helps to get an understanding of things first.

     

    Cheers,

    -Nico

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