Why do I get this "function not declared in this scope" error?

¬

¬NichtBenOP•10/16/25, 3:57 PM

SSSurfer\SSSurfer.ino: In function 'void loop()':
SSSurfer\SSSurfer.ino:18:3: error: 'delayCheck' was not declared in this scope
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
SSSurfer\SSSurfer.ino:18:3: note: suggested alternative: 'delay'
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
   delay
SSSurfer\SSSurfer.ino:20:7: error: 'inRange' was not declared in this scope
   if (inRange(analogRead(buttonPin), 505)) {
       ^~~~~~~
exit status 1

Compilation error: 'delayCheck' was not declared in this scope

SSSurfer\SSSurfer.ino: In function 'void loop()':
SSSurfer\SSSurfer.ino:18:3: error: 'delayCheck' was not declared in this scope
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
SSSurfer\SSSurfer.ino:18:3: note: suggested alternative: 'delay'
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
   delay
SSSurfer\SSSurfer.ino:20:7: error: 'inRange' was not declared in this scope
   if (inRange(analogRead(buttonPin), 505)) {
       ^~~~~~~
exit status 1

Compilation error: 'delayCheck' was not declared in this scope

SSSurfer\SSSurfer.ino: In function 'void loop()':
SSSurfer\SSSurfer.ino:18:3: error: 'delayCheck' was not declared in this scope
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
SSSurfer\SSSurfer.ino:18:3: note: suggested alternative: 'delay'
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
   delay
SSSurfer\SSSurfer.ino:20:7: error: 'inRange' was not declared in this scope
   if (inRange(analogRead(buttonPin), 505)) {
       ^~~~~~~
exit status 1

Compilation error: 'delayCheck' was not declared in this scope

SSSurfer\SSSurfer.ino: In function 'void loop()':
SSSurfer\SSSurfer.ino:18:3: error: 'delayCheck' was not declared in this scope
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
SSSurfer\SSSurfer.ino:18:3: note: suggested alternative: 'delay'
   delayCheck(5000, 1000, 505, 328);
   ^~~~~~~~~~
   delay
SSSurfer\SSSurfer.ino:20:7: error: 'inRange' was not declared in this scope
   if (inRange(analogRead(buttonPin), 505)) {
       ^~~~~~~
exit status 1

Compilation error: 'delayCheck' was not declared in this scope

¬

¬NichtBenOP•10/16/25, 3:58 PM

I've got two relevant tabs within my project, and I find it strange that it complains about

delayCheck

delayCheck

delayCheck

delayCheck and

inRange

inRange

inRange

inRange, but not about

IdleAnimation

IdleAnimation

IdleAnimation

IdleAnimation for example, despite being declared in the same tab:

¬

¬NichtBenOP•10/16/25, 3:58 PM

SSSurfer.ino:

#include <LedControl.h>
const int buttonPin = A5;

LedControl lc = LedControl(12, 11, 10, 1); //DIN, CLK, CS, # of Displays connected

void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));
  
  lc.shutdown(0, false);
  lc.setIntensity(0, 1);   // brightness 0–15
  lc.clearDisplay(0);
}

void loop() {
  idleAnimation();
  delayCheck(5000, 1000, 505, 328);

  if (inRange(analogRead(buttonPin), 505)) {
    lc.clearDisplay(0);
    delay(3000);
    ssGame();
  }
  else if (inRange(analogRead(buttonPin), 328)) {
    lc.clearDisplay(0);
    delay(3000);
    subwayGame();
  }
}

#include <LedControl.h>
const int buttonPin = A5;

LedControl lc = LedControl(12, 11, 10, 1); //DIN, CLK, CS, # of Displays connected

void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));
  
  lc.shutdown(0, false);
  lc.setIntensity(0, 1);   // brightness 0–15
  lc.clearDisplay(0);
}

void loop() {
  idleAnimation();
  delayCheck(5000, 1000, 505, 328);

  if (inRange(analogRead(buttonPin), 505)) {
    lc.clearDisplay(0);
    delay(3000);
    ssGame();
  }
  else if (inRange(analogRead(buttonPin), 328)) {
    lc.clearDisplay(0);
    delay(3000);
    subwayGame();
  }
}

#include <LedControl.h>
const int buttonPin = A5;

LedControl lc = LedControl(12, 11, 10, 1); //DIN, CLK, CS, # of Displays connected

void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));
  
  lc.shutdown(0, false);
  lc.setIntensity(0, 1);   // brightness 0–15
  lc.clearDisplay(0);
}

void loop() {
  idleAnimation();
  delayCheck(5000, 1000, 505, 328);

  if (inRange(analogRead(buttonPin), 505)) {
    lc.clearDisplay(0);
    delay(3000);
    ssGame();
  }
  else if (inRange(analogRead(buttonPin), 328)) {
    lc.clearDisplay(0);
    delay(3000);
    subwayGame();
  }
}

#include <LedControl.h>
const int buttonPin = A5;

LedControl lc = LedControl(12, 11, 10, 1); //DIN, CLK, CS, # of Displays connected

void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));
  
  lc.shutdown(0, false);
  lc.setIntensity(0, 1);   // brightness 0–15
  lc.clearDisplay(0);
}

void loop() {
  idleAnimation();
  delayCheck(5000, 1000, 505, 328);

  if (inRange(analogRead(buttonPin), 505)) {
    lc.clearDisplay(0);
    delay(3000);
    ssGame();
  }
  else if (inRange(analogRead(buttonPin), 328)) {
    lc.clearDisplay(0);
    delay(3000);
    subwayGame();
  }
}

¬

¬NichtBenOP•10/16/25, 3:59 PM

funktionen.ino:

void idleAnimation() {
  int i = random(1, 4);

  if (i == 1) {
    idleTalking();
  }
  if (i == 2) {
    idleLooking();
  }
  if (i == 3) {
    idleTurning();
  }
}

bool inRange(int input, int target, int range = 10) {
  return  (input > target - range && input < target + range);
}

void delayCheck(int time, int checkAmount, int buttonA, int buttonB = -1, int buttonC = -1, int buttonD = -1, int buttonE = -1) {
  for (int i = 0; i < checkAmount; i++) {
    delay(time / checkAmount);

    int readValue = analogRead(buttonPin);
    
    if (inRange(readValue, buttonA)) return;

    if (readValue != -1 && inRange(readValue, buttonB)) return;
    if (readValue != -1 && inRange(readValue, buttonC)) return;
    if (readValue != -1 && inRange(readValue, buttonD)) return;
    if (readValue != -1 && inRange(readValue, buttonE)) return;
  }
}

void idleAnimation() {
  int i = random(1, 4);

  if (i == 1) {
    idleTalking();
  }
  if (i == 2) {
    idleLooking();
  }
  if (i == 3) {
    idleTurning();
  }
}

bool inRange(int input, int target, int range = 10) {
  return  (input > target - range && input < target + range);
}

void delayCheck(int time, int checkAmount, int buttonA, int buttonB = -1, int buttonC = -1, int buttonD = -1, int buttonE = -1) {
  for (int i = 0; i < checkAmount; i++) {
    delay(time / checkAmount);

    int readValue = analogRead(buttonPin);
    
    if (inRange(readValue, buttonA)) return;

    if (readValue != -1 && inRange(readValue, buttonB)) return;
    if (readValue != -1 && inRange(readValue, buttonC)) return;
    if (readValue != -1 && inRange(readValue, buttonD)) return;
    if (readValue != -1 && inRange(readValue, buttonE)) return;
  }
}

void idleAnimation() {
  int i = random(1, 4);

  if (i == 1) {
    idleTalking();
  }
  if (i == 2) {
    idleLooking();
  }
  if (i == 3) {
    idleTurning();
  }
}

bool inRange(int input, int target, int range = 10) {
  return  (input > target - range && input < target + range);
}

void delayCheck(int time, int checkAmount, int buttonA, int buttonB = -1, int buttonC = -1, int buttonD = -1, int buttonE = -1) {
  for (int i = 0; i < checkAmount; i++) {
    delay(time / checkAmount);

    int readValue = analogRead(buttonPin);
    
    if (inRange(readValue, buttonA)) return;

    if (readValue != -1 && inRange(readValue, buttonB)) return;
    if (readValue != -1 && inRange(readValue, buttonC)) return;
    if (readValue != -1 && inRange(readValue, buttonD)) return;
    if (readValue != -1 && inRange(readValue, buttonE)) return;
  }
}

void idleAnimation() {
  int i = random(1, 4);

  if (i == 1) {
    idleTalking();
  }
  if (i == 2) {
    idleLooking();
  }
  if (i == 3) {
    idleTurning();
  }
}

bool inRange(int input, int target, int range = 10) {
  return  (input > target - range && input < target + range);
}

void delayCheck(int time, int checkAmount, int buttonA, int buttonB = -1, int buttonC = -1, int buttonD = -1, int buttonE = -1) {
  for (int i = 0; i < checkAmount; i++) {
    delay(time / checkAmount);

    int readValue = analogRead(buttonPin);
    
    if (inRange(readValue, buttonA)) return;

    if (readValue != -1 && inRange(readValue, buttonB)) return;
    if (readValue != -1 && inRange(readValue, buttonC)) return;
    if (readValue != -1 && inRange(readValue, buttonD)) return;
    if (readValue != -1 && inRange(readValue, buttonE)) return;
  }
}

¬¬NichtBen Hello everyone, I'm still kinda new to Arduino, but I thought that I at least kn...

A

AnonEngineering•10/16/25, 5:28 PM

Put your functions into a

functions.h

functions.h

functions.h

functions.h (not an

ino

ino

ino

ino) file, then

#include

#include

#include

#include that file in the main sketch. Then it compiles (until it complains about functions you don't have listed above

)

AAnonEngineering Put your functions into a `functions.h` (not an `ino`) file, then `#include` tha...

¬

¬NichtBenOP•10/16/25, 7:11 PM

I assume it's not as easy as to just change the file extension from .ino to .h, right?

¬

¬NichtBenOP•10/16/25, 7:14 PM

Also how come that this issue is only popping up now, I have a bunch of different tabs in my project, and this is the first time that I got this. I used different functions across mutiple tabs a bunch of times now.

A

AnonEngineering•10/16/25, 11:29 PM

should be able to simply rename the tab

J

jim lee•10/17/25, 7:59 PM

There's no #include for it anyway.

Why do I get this "function not declared in this scope" error?

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