'GREEN' was not declared in this scope

Using Arduino Programming Questions
1

Hi,
The code I am testing shown error: 'GREEN' was not declared in this scope.
My question is the 'WHITE' was not declared either, why that can pass compile.

The 'GREEN' section between two line of Asterisks is new added .

Thanks
Adam

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SSD1306_LCDHEIGHT 64 //// https://forum.arduino.cc/t/ssd1306-says-height-incorrect/351277
//// #error ("Height incorrect, please fix Adafruit_SSD1306.h!");

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#if (SSD1306_LCDHEIGHT != 64)

#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif


const unsigned char audi_logo [] PROGMEM = {
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};


int sensorValue = 0;
int voltage = 0;
const int analogInPin = A0;

//display.invertDisplay(true); // invert the colours of led display
//display.invertDisplay(false);
//display.drawPixel(10, 10, WHITE);//to highlight a particular pixel
void setup()
{
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize I2C addr to 0x3C ( for 128x64 Display )

  display.clearDisplay(); // clear the display before starting the program to avoid adafruit splashscreen ( *we can also skip it by modifing header file )
  // drawBitmap(x-axis position, y-axis position, bitmap data, bitmap width, bitmap height, color)

}

void loop()
{

  display.clearDisplay();
  display.drawBitmap(0, 0, audi_logo, 128, 64, WHITE);
  display.display();
  delay(1000);

  //****************************************************************
  display.clearDisplay();
  display.drawBitmap(0, 0, audi_logo, 128, 64, GREEN);
  display.display();
  delay(1000);
  //******************************************************************

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("VIRAL");
  display.setCursor(1, 20);
  display.println("SCIENCE");
  display.display();
  delay(1000);

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(GREEN);
  display.setCursor(1, 0);
  display.println("SUBSCRIBE");
  display.display();
  delay(1000);

}

error:

Arduino: 1.8.13 (Windows 7), Board: "ESP32 Dev Module, Enabled, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi/BT), QIO, 80MHz, 4MB (32Mb), 921600, None"

E:\ENGINEERING\DIY\ESP32 CAM\PROJECTS\004_Arduino OLED Bitmap Graphics Display\Arduino_OLED_Bitmap_M2\Arduino_OLED_Bitmap_M2.ino: In function 'void loop()':

Arduino_OLED_Bitmap_M2:124:48: error: 'GREEN' was not declared in this scope

   display.drawBitmap(0, 0, audi_logo, 128, 64, GREEN);
                                            ^

exit status 1

'GREEN' was not declared in this scope

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
2

The compiler does not necessarily report the errors in the order they show up in the code.
Add
int GREEN;
int WHITE;
below the #include statements and see if that helps.

3

Most likely, GREEN etc. are colors declared and defined in a different graphics library.

The color constants you use have to be consistent with the graphics library and display you are using. Start by studying the program examples for your display.

What Arduino, and what display do you actually have?

4

A pertinent comment in the library you are using:

Arduino library for monochrome OLEDs

5

Thanks.
I'll add the two ints.
Sorry my uncleanly description, when I said the 'WHITE' passed the compiling meaning the code passed compiling without the 'GREEN' section added.

6

Thanks.
I used Arduino UNO R3 USB+ SSD1306 12864 OLCD.

7

Thank you.
I'll try other Libs.

8

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