I am using a elegoo 2.8'' tft touch screen, and it uses most of the pins BUT i need a PWM pin for something else on the project; so How to change definition of LCD_D1 from pin 9 to pin 1? i can not see to see how/where this pin is define.
I am using an UNO now but it i would like to move to a micro or nano but they will have the same problem, the default pin out use all the PWM pin (as far as i can tell ) on more boards but the Mega, and i do not want to have to use a Mega.
Hi @RedShadowProjects
Welcome to the forum.
If you use a UNO or Nano, Pin 1 is used for programming and serial communication.
Tom.... 
Yes Pin 1 is use for programing, BUT I can still use it after programing for GPOI.
Welcome to the forum
If it is not done expressly in your sketch then LCD_D1 is probably #defined by the library that you are using. Have you looked for the definition in the library .h file ?
Ya, i did look in the libraries but i did not find it (does not me it is not there). I did not know it some one would be like it is define over in XYZ or that it is apart of some build it library or precompiled thing.
Which library or libraries are you using ?
Please post your full sketch, using code tags when you do
Posting your code using code tags prevents parts of it being interpreted as HTML coding and makes it easier to copy for examination
In my experience the easiest way to tidy up the code and add the code tags is as follows
Start by tidying up your code by using Tools/Auto Format in the IDE to make it easier to read. Then use Edit/Copy for Forum and paste what was copied in a new reply. Code tags will have been added to the code to make it easy to read in the forum thus making it easier to provide help.
It is also helpful to post full error messages in code tags as it makes it easier to scroll through them and copy them for examination
well as to libraries i am not full sure (i am new to this) but some of the examples are include these:
Elegoo_GFX.h
Elegoo_TFTLCD.h
TouchScreen.h
Then they too include thing, but in all the files i can find i do not see "LCD_d1" defined. Now maybe in the code they are calling it something else, this is what it is called in the hardware spec.
I dont know that the code really maters as i am not getting an error, but here is a sketch that would work for this case:
// Paint example specifically for the TFTLCD breakout board.
// If using the Arduino shield, use the tftpaint_shield.pde sketch instead!
// DOES NOT CURRENTLY WORK ON ARDUINO LEONARDO
#include <Elegoo_GFX.h> // Core graphics library
#include <Elegoo_TFTLCD.h> // Hardware-specific library
#include <TouchScreen.h>
#if defined(__SAM3X8E__)
#undef __FlashStringHelper::F(string_literal)
#define F(string_literal) string_literal
#endif
// When using the BREAKOUT BOARD only, use these 8 data lines to the LCD:
// For the Arduino Uno, Duemilanove, Diecimila, etc.:
// D0 connects to digital pin 8 (Notice these are
// D1 connects to digital pin 9 NOT in order!)
// D2 connects to digital pin 2
// D3 connects to digital pin 3
// D4 connects to digital pin 4
// D5 connects to digital pin 5
// D6 connects to digital pin 6
// D7 connects to digital pin 7
// For the Arduino Mega, use digital pins 22 through 29
// (on the 2-row header at the end of the board).
// D0 connects to digital pin 22
// D1 connects to digital pin 23
// D2 connects to digital pin 24
// D3 connects to digital pin 25
// D4 connects to digital pin 26
// D5 connects to digital pin 27
// D6 connects to digital pin 28
// D7 connects to digital pin 29
// For the Arduino Due, use digital pins 33 through 40
// (on the 2-row header at the end of the board).
// D0 connects to digital pin 33
// D1 connects to digital pin 34
// D2 connects to digital pin 35
// D3 connects to digital pin 36
// D4 connects to digital pin 37
// D5 connects to digital pin 38
// D6 connects to digital pin 39
// D7 connects to digital pin 40
#define YP A3 // must be an analog pin, use "An" notation!
#define XM A2 // must be an analog pin, use "An" notation!
#define YM 9 // can be a digital pin
#define XP 8 // can be a digital pin
#define TS_MINX 150
#define TS_MINY 120
#define TS_MAXX 920
#define TS_MAXY 940
// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// For the one we're using, its 300 ohms across the X plate
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
// optional
#define LCD_RESET A4
// Assign human-readable names to some common 16-bit color values:
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
Elegoo_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);
#define BOXSIZE 40
#define PENRADIUS 3
int oldcolor, currentcolor;
void setup(void) {
Serial.begin(9600);
Serial.println(F("Paint!"));
tft.reset();
uint16_t identifier = tft.readID();
if(identifier == 0x9325) {
Serial.println(F("Found ILI9325 LCD driver"));
} else if(identifier == 0x9328) {
Serial.println(F("Found ILI9328 LCD driver"));
} else if(identifier == 0x7575) {
Serial.println(F("Found HX8347G LCD driver"));
} else if(identifier == 0x9341) {
Serial.println(F("Found ILI9341 LCD driver"));
} else if(identifier == 0x8357) {
Serial.println(F("Found HX8357D LCD driver"));
} else {
Serial.print(F("Unknown LCD driver chip: "));
Serial.println(identifier, HEX);
Serial.println(F("If using the Elegoo 2.8\" TFT Arduino shield, the line:"));
Serial.println(F(" #define USE_Elegoo_SHIELD_PINOUT"));
Serial.println(F("should appear in the library header (Elegoo_TFT.h)."));
Serial.println(F("If using the breakout board, it should NOT be #defined!"));
Serial.println(F("Also if using the breakout, double-check that all wiring"));
Serial.println(F("matches the tutorial."));
return;
}
tft.begin(identifier);
tft.fillScreen(BLACK);
tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);
tft.fillRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, GREEN);
tft.fillRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, CYAN);
tft.fillRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, BLUE);
tft.fillRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, MAGENTA);
// tft.fillRect(BOXSIZE*6, 0, BOXSIZE, BOXSIZE, WHITE);
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
currentcolor = RED;
pinMode(13, OUTPUT);
}
#define MINPRESSURE 10
#define MAXPRESSURE 1000
void loop()
{
digitalWrite(13, HIGH);
TSPoint p = ts.getPoint();
digitalWrite(13, LOW);
// if sharing pins, you'll need to fix the directions of the touchscreen pins
//pinMode(XP, OUTPUT);
pinMode(XM, OUTPUT);
pinMode(YP, OUTPUT);
//pinMode(YM, OUTPUT);
// we have some minimum pressure we consider 'valid'
// pressure of 0 means no pressing!
if (p.z > MINPRESSURE && p.z < MAXPRESSURE) {
/*
Serial.print("X = "); Serial.print(p.x);
Serial.print("\tY = "); Serial.print(p.y);
Serial.print("\tPressure = "); Serial.println(p.z);
*/
if (p.y < (TS_MINY-5)) {
Serial.println("erase");
// press the bottom of the screen to erase
tft.fillRect(0, BOXSIZE, tft.width(), tft.height()-BOXSIZE, BLACK);
}
// scale from 0->1023 to tft.width
p.x = map(p.x, TS_MINX, TS_MAXX, tft.width(), 0);
p.y = map(p.y, TS_MINY, TS_MAXY, tft.height(), 0);
/*
Serial.print("("); Serial.print(p.x);
Serial.print(", "); Serial.print(p.y);
Serial.println(")");
*/
if (p.y < BOXSIZE) {
oldcolor = currentcolor;
if (p.x < BOXSIZE) {
currentcolor = RED;
tft.drawRect(0, 0, BOXSIZE, BOXSIZE, WHITE);
} else if (p.x < BOXSIZE*2) {
currentcolor = YELLOW;
tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, WHITE);
} else if (p.x < BOXSIZE*3) {
currentcolor = GREEN;
tft.drawRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, WHITE);
} else if (p.x < BOXSIZE*4) {
currentcolor = CYAN;
tft.drawRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, WHITE);
} else if (p.x < BOXSIZE*5) {
currentcolor = BLUE;
tft.drawRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, WHITE);
} else if (p.x < BOXSIZE*6) {
currentcolor = MAGENTA;
tft.drawRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, WHITE);
}
if (oldcolor != currentcolor) {
if (oldcolor == RED) tft.fillRect(0, 0, BOXSIZE, BOXSIZE, RED);
if (oldcolor == YELLOW) tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, YELLOW);
if (oldcolor == GREEN) tft.fillRect(BOXSIZE*2, 0, BOXSIZE, BOXSIZE, GREEN);
if (oldcolor == CYAN) tft.fillRect(BOXSIZE*3, 0, BOXSIZE, BOXSIZE, CYAN);
if (oldcolor == BLUE) tft.fillRect(BOXSIZE*4, 0, BOXSIZE, BOXSIZE, BLUE);
if (oldcolor == MAGENTA) tft.fillRect(BOXSIZE*5, 0, BOXSIZE, BOXSIZE, MAGENTA);
}
}
if (((p.y-PENRADIUS) > BOXSIZE) && ((p.y+PENRADIUS) < tft.height())) {
tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
}
}
}
How did you come to the conclusion that LCD_D1 needed to be redefined ?
for the project i want to do, i want the screen and i need one PWM pin for other things like servos and LED ( i have several project ideas). as far as i can tell the screen uses all the PWM pins even on the micro (it has more IO pins but not more PWM pins; as far as i can see).
As to pin 9, LCD_D1 goes to pin 9 (which is an PWM) but the reset of the data bus LCD_Dx are normal io pins, so i was thinking if can move LCD_D1 to a different pin i would free up the PWM pin i need.
So LCD_D1 is a label on the LCD
How is the LCD connected to the UNO ? Does it plug in in some way ?
Have you looked at the AVR_Slow_PWM Libraery by Khoi Hoang for the UNO?
It is supposed to let you use a non-PWM pin as a PWM pin.
Or;
Although its last update was 2018.
Tom....
Servos don't need a PWM pin. Do you need to control the brightness of an LED or just turn it on/off ?
UKH
It is on the LCD and listed in the hardware spec for the pin out.
It is a shield (for now i can move to a ribin cable later or remove that pin and wire it)
I though you did fore serve and the led is for a universal remote i have not tried a normal pin the instruction s i have said to use a PWM pin and i have that working separately.
Tom
i have not but i will, that could be a good solution if i can get it to work.
OK so i think i figure it out or i could be just going to mess it up (if you know do let me know)
There is a file "pin_magic.h" in here is were all the pin mapping seem to be done. but not by pins but by bits i register. In my case with a uno (for now) this is with bit in PORTSD/PIND and PORTSB/PINB . here:
// Shield pin usage:
// LCD Data Bit : 7 6 5 4 3 2 1 0
// Digital pin #: 7 6 13 4 11 10 9 8
// Uno port/pin : PD7 PD6 PB5 PD4 PB3 PB2 PB1 PB0
.
.
.
// Arduino Uno, Duemilanove, etc.
#ifdef USE_ADAFRUIT_SHIELD_PINOUT
.
.
.
// Write 8-bit value to LCD data lines
#define write8inline(d) { \
PORTD = (PORTD & B00101111) | ((d) & B11010000); \
PORTB = (PORTB & B11010000) | ((d) & B00101111); \
WR_STROBE; } // STROBEs are defined later
// Read 8-bit value from LCD data lines. The signle argument
// is a destination variable; this isn't a function and doesn't
// return a value in the conventional sense.
#define read8inline(result) { \
RD_ACTIVE; \
DELAY7; \
result = (PIND & B11010000) | (PINB & B00101111); \
RD_IDLE; }
This mask in the bits form different paces to make the reads and writs. i will have to take ping 9 out with in this case is PORTSB bit 1 the just and/or in the new port. so if i were to use D1 i think that this would be the change (in one case):
This line:
result = (PIND & B11010000) | (PINB & B00101111)
Would be come:
result = (PIND & B11010010) | (PINB & B00101101)
Oh how convenient D1 and D9 are in the same location just in different register so i can just mask out PINB bit 1 and unmask PIND bit 1 for the read.
Turns out i was wrong 
, as that did not work.
SO any other ideas how i move this pin?
Did you change the code for the defines for write8inline, read8inline, and setWriteDirInline?
Ya i did all 3 , and just to be sure i was in the section was being used 'using' i put bad code in it so i could verify it did not compile ( and would compile with the crap code in other sections), so i know the changes were in the code i am using. Problem is with the changes to "write8inline, read8inline, and setWriteDirInline" the screen still was working with the original wiring and when i move the LDC_D1 to pin 1 (not 9) the screen stopped working.
so dont know.
I may have a workaround; that is to use a "Arduino Nano 33 IoT" it has an PWM pin that the screen is not using, A5.
BUT it still bother me that i can not get this setup to work and i should be able too.