Yes, of course.  Thanks alot

Yes I get that part.  But why does the VCO get ahead but not the reference clock?

Hello,

I am trying to understand how PLLs work.  I get the general idea but I'm still stuck as to why the reference clock ( Quartz crystal ) remains steady but the VCO ( Voltage Controlled Oscillator ) will drift and needs help to remain constant.  Can anyone help?

Thanks.

When reading about some HW features I often see things like L3 interconnect, L2 Cache master.  Can someone explain what these layers mean?  How many are there?

I would do something like this:

Code:

const int MAX_LOOPS = 480;
  int LED_check=0;
  for(int i=0;i<MAX_LOOPS;i++)
  {
   
   if( (i%10) == 0)
   {
   Serial.println("TURN LED ON");
   LED_check++; //0-9 to turn on each LED
   }
  }

Also:

If I pass by reference it is working OK.  Any ideas what mistake I made when using those pointers?  Are pointers the correct way to do it here?

Hello,

I have the following code.

Code:

Serial.println("sensorUIInfo->airTemp MAIN C");
 getAirTemp();  //Air Temp = 23
  
  //Draw pH value
  myGLCD.printNumF(sensorUIInfo->phLevel, 1, 20, 120);
  
  Serial.println("sensorUIInfo->airTemp MAIN D");
 getAirTemp();  //Air Temp = 32

The reason is that printNumF, if I do printNumI or nothing it's OK.  Somehow that printF alters the value.

The struct is like this:

Code:

//All the data from the HW sensors.
    struct SENSOR{
    float phLevel;
    float eCLevel;
    int airTemp;
    int waterTemp;
    };

SENSOR* sensorUIInfo;

And I update from the engine to the UI like this:

Code:

void HydroponicsUI::updateInfoFromSensors( SENSOR* sensorInformation )
{
 Serial.println("sensorInformation->airTemp");
 Serial.println(sensorInformation->airTemp);
 sensorUIInfo->phLevel = sensorInformation->phLevel;
 sensorUIInfo->eCLevel = sensorInformation->eCLevel;
 sensorUIInfo->airTemp = sensorInformation->airTemp;
 sensorUIInfo->waterTemp =  sensorInformation->waterTemp;    

}

The controller does the update like this:

Code:

//Update the UI of the latest Sensor Info
   Hydro_UI.updateInfoFromSensors( Hydro_Eng.getSensorInformation() );

Is this an error in my code?

Thanks.

By sketch, I mean the .pde and not my library.

If I put this in my sketch, it compiles, Without those it says undefined reference.

#include <UTFT.h> // Graphics Library
#include <UTouch.h> //Touch Screen Library



but when it compiles it does not work. 

so in the .cpp

// for the Arduino Mega 2560 pins and Sainsmart TFT shield.
UTFT myGLCD(ITDB32S, 38,39,40,41);   
UTouch myTouch(6,5,4,3,2);


UI::UI() {

   //Serial.begin(115200);
   // Initial setup
    myGLCD.InitLCD(); //CRASH HERE
    myGLCD.clrScr();

    myTouch.InitTouch();
    myTouch.setPrecision(PREC_MEDIUM);

    myGLCD.setFont(BigFont);
    myGLCD.setBackColor(0, 0, 255);
    

}

in the .h file

// Declare which fonts we will be using
extern uint8_t BigFont[];


#include "../UTFT/UTFT.h"
#include "../UTouch/UTouch.h"

I can link to my own library fine, how can I link to a library within a library?

#include "../UTFT/UTFT.h"
#include "../UTouch/UTouch.h"

And it does not work.  So in my library I link to those, but those are not found.

I have made two libraries an Engine and a UI.

From the sketch I want to access these.  The problem is that the UI uses the UTouch and UTFT library and the engine use the DHT11 and RTCLib libraries amongst others. How can I link those libraries from my own?  I have even done this:

#include "../UTFT/UTFT.h"
#include "../UTouch/UTouch.h"

Thanks.

The same thing happened to me.  Just keep flashing it and on the ~20th time it will work.  After that it will always flash OK.  I am using 1.03 and I have the shield too.

Would anyone know how to bypass the shield and just connect the screen directly using wires?

The problem is that the shield uses the vin pin too, no idea why.  Therefore how could I use the vin pin?

Edit:  I have two Arduino Mega 2560s

Hello,

I have a Sainsmart 3.2" LCD and shield.  The shield takes up all the power pins.  I was planning on powering the LCD Arduino from another one via the vin.  Is this possible?

Thanks.