Display was not declared in this scope

Projects Programming
1

Hi,

I was trying to upload a bit of code to my arduino and I keep getting this error message:

**exit status 1**
**'display' was not declared in this scope**




#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <Adafruit_ST7735.h>
#include <SPI.h>
#include <EEPROM.h> 
#include <AnalogKey.h>
#include <GyverButton.h>

#define EE_DATA_ADDR 1 
#define EE_KEY_ADDR 0  
#define EE_KEY 0xBE    

#define TFT_CS       10
#define TFT_RST       8
#define TFT_DC        9

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
//
char masschar[5];  
String massstring;  
int set,setmass,rapidtime;
boolean initial,flagmass, flagmassset, rapidflag, men, disp;  
int n=0;//
float input_volt = 0.0;
float temp=0.0;
float r1=330000.0; 
float r2=33300.0; 
float velocity; 
float energy;                
volatile unsigned long gap1, gap2;    
unsigned long lastshot;
unsigned long Last_time;
boolean butt_flag = 0;
int8_t arrowPos = 0;  
volatile unsigned long photocell1=0, photocell2=0, firstShot=0; 
volatile int shot1=0,shot2=0; 
volatile bool newShot=false; 
float photoDistance=0.09082; 
int lastShot=0; 
int speedBB=0; 
bool err=false, dispFlag=false; 
bool blocked2=false, blocked3=false; 
bool dispClear; 
int analog2, analog3; 
unsigned long rateFire=0; 
unsigned long prMicros2=0,prMicros3=0; 
unsigned long clearDisplayTime=5000000, prMicrosClear=0; 

void setup() {
attachInterrupt(0,Photo1,RISING); 
attachInterrupt(1,Photo2,RISING); 
Serial.begin(9600);
display.setBrightness(0x0f); 
SEG_ERR[3]=0; 
display.setSegments(data);
}

void Photo1() {
photocell1=micros();
if (!newShot) firstShot=photocell1;
shot1++;
newShot=true;
}

void Photo2() {
photocell2=micros();
shot2++;
}
void PrintDisplay() {
  Serial.print (speedBB);
  Serial.println (" m/s");
  Serial.print (rateFire);
  Serial.println (" rpm");
    dispClear=false;
    prMicrosClear=micros();
    if (!err && rateFire==0) display.showNumberDec(speedBB, false, 4, 0);  
    if (!err && rateFire!=0) { 
    display.showNumberDec(rateFire, false, 4, 0);
    rateFire=0;}
    if (err) {display.setSegments(SEG_ERR);err=false;} 
    dispFlag=false;
}
void Setting2() {
   analog2=analogRead(A3); 
   Serial.println(analog2); 
   data[0] = 0b00000110;
   data[1]=0;
   data[2]=0;
   data[3]=0;
   if (analog2>410) data[1]=0b00000001;
   if (analog2<390) data[1]=0b00001000;
   if (analog2>390 && analog2<410) data[1]=0b01000000;
   display.setSegments(data); 
}

void Setting3() { 
  analog3=analogRead(A2); 
   Serial.println(analog3);
   data[0] = 0b01011011; 
   data[1]=0;
   data[2]=0;
   data[3]=0;
   if (analog3>410) data[1]=0b00000001;
   if (analog3<390) data[1]=0b00001000;
   if (analog3>390 && analog3<410) data[1]=0b01000000;
   display.setSegments(data);
}

void ClearDisplay() {
 **display.setSegments(data_clr);**
  dispClear=true;





void loop() {
if (analogRead(A3)<=450) prMicros2=micros(); 
if (analogRead(A2)<=450) prMicros3=micros();
if (micros()-prMicros2>1500000) blocked2=true;
if (micros()-prMicros3>1500000 && !blocked2) blocked3=true;
if (blocked2) Setting2();
if (blocked3) Setting3();


if (newShot) { 
  ClearDisplay();
  if (micros()-photocell1 > 1000000) { 
  if (photocell2>photocell1 && shot1==shot2) { 
    speedBB=(10000000*(photoDistance)/(photocell2-photocell1)); 
    if (shot1-lastShot>4) rateFire=60000000/((photocell1-firstShot)/(shot1-lastShot)); 
  } else err=true; 
    dispFlag=true;
    newShot=false;
    if (!err) lastShot=shot1; else {shot1=lastShot;shot2=lastShot;}  
  }
}

if (dispFlag && !blocked2 && !blocked3) PrintDisplay();

if (micros()-prMicrosClear>clearDisplayTime && !blocked2 && !blocked3 && !dispFlag && !dispClear) ClearDisplay();
delay(300);
}
2

How about sharing the error message? And, please use code tags.

3

exit status 1
'display' was not declared in this scope

4

Welcome to the forum

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

It looks like you have not created the display object before using it. Have you looked at the examples that came with the Adafruit_ST7735 library.

Why did you #include the library twice ?

6

There is no variable called display; you however have a variable called tft. Renaming of the two might do the trick.

7

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