TFT display does not print the string coming from another Arduino

Projects General Guidance
1

Hi, the project I'm doing at the moment is the following: I have a sensor that detects the Amps arriving in the house, connected from it to Arduino Uno I calculate a series of variables and print them on the serial monitor; so far no problem.

I however want to print what I see on the serial warning on a TFT screen, specifically this:
http://www.lcdwiki.com/3.5inch_Arduino_Display-Mega2560

This shield is connected to an Arduino Mega and is connected via TX / RX to the Arduino Uno to which the sensor is connected. The communication between the two works without problems.

I have no experience with this type of monitor soi don't know what type of instruction i have to use, looking on the internet I created the following code but for about two weeks I have not yet been able to print completely what comes to the arduino Mega.

What do you advise me to do, do you have experience on this monitor?


#include <LCDWIKI_GUI.h>  //librerie, colori e inizializazione schermo
#include <LCDWIKI_KBV.h>
#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF
LCDWIKI_KBV mylcd(ILI9486, A3, A2, A1, A0, A4);

char Test1 [106]; //variabile in cui salvo ciò che arriva dal serial monitor

void setup()
{
  Serial1.begin(9600);  //serial 0 occupato dal monitor, utilizzo serial 1
  mylcd.Init_LCD();     //inizializzo schermo
  mylcd.Fill_Screen(BLACK); //schermo tutto nero
  delay(1000);
}


void loop()
{
  {
    if (Serial1.available())
      //int array[107] = { 0 };        //altro tentativo
      //char Test1[107] = {Serial1.read()}; //altro tentativo
      //String (Serial1.read()) = String Test1;  //altro tentativo
      Test1 = Serial1.read();  // la stringa che arriva al serial lo salvo nella variabile
  }
  mylcd.Set_Text_Size(3);
  mylcd.Set_Text_Back_colour (BLACK);
  mylcd.Set_Text_colour (WHITE);
  mylcd.Print("Valori dal Sensore :", 5, 6);

  mylcd.Set_Text_Size(2);
  mylcd.Set_Text_Back_colour (BLACK);
  mylcd.Set_Text_colour (WHITE);
  //mylcd.Draw_Char(5, 80, Test1, WHITE, BLACK, 2, 0);
  mylcd.Print(Test1, 5, 100);

  delay (1000);

  mylcd.Set_Text_Size(2);
  mylcd.Set_Text_Back_colour (BLACK);
  mylcd.Set_Text_colour (BLACK);
  //mylcd.Draw_Char(5, 80, Test1, BLACK, BLACK, 2, 0);
  mylcd.Print(Test1, 5, 100);

  delay(250);
}

Screenshot (3)
Screenshot (3)1366×768 92.7 KB

2

Are you using pins 0 and 1 on the Uno for Serial communication ? Please post the sketch that you are using on the Uno

3

It's not clear to me if the examples that come with the library for the LCD screen work?

It's also not clear to me if the TX / RX that you refer to are are the ones on the Mega? If so, the code that you posted makes use of Serial1 and you should use the TX1 / RX1 pins of the Mega.

Your topic is not related to Interfacing w/ Software on the Computer and has therefor been moved to a more suitable location on the forum.

4

Yes the examples work perfectly
I use TX1 / RX1 on the Mega with the screen and TR / RX on the Uno with the sensor
Thanks

5

I use TX1 / RX1 on the Mega with the screen and (0 / 1 ) TR / RX on the Uno with the sensor

code aruino uno


#include "EmonLib.h"
#define VOLT_CAL 148.7
#define CURRENT_CAL 63.9

EnergyMonitor emon1;

float currentValue;
float previousValue;
float potMedia;
float consMedio;
float consTot;


void setup()
{
  Serial.begin(9600);

  emon1.voltage(1, VOLT_CAL, 1.7);
  emon1.current(0, CURRENT_CAL);

}

void loop()
{
  emon1.calcVI(20, 1000);

  float currentDraw = emon1.Irms;
  float supplyVoltage = emon1.Vrms;

  previousValue = currentValue;
  currentValue = currentDraw;


  potMedia = (((currentValue * 220) + (previousValue * 220)) / 2); //calcolo la potenza P = V * I

  consMedio =  potMedia * (2); //consumo in W x secondo

  consTot = consMedio + consTot;


  Serial.print("Corrente [A]: ");
  Serial.print(currentDraw);

  Serial.print("    Potenza [W]: ");
  Serial.print(potMedia);

  Serial.print("    ConsumoMedio [Ws]:");
  Serial.print(consMedio, 7);

  Serial.print("    ConsumoTot [kWh]:");
  Serial.println(consTot / 3600000, 7);

}
6

Those pins are used by the Serial interface to upload code and communicate with the Serial monitor

Use SoftwareSerial on the Uno to create a second serial interface on pins of your choice but not 0 and 1

7

Ok thank you, i fixed that.
Nothing changed, i think the problems are all in the tft display code

8

Please post your revised sketch a project schematic

9

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