NODEMCU Resetting after few seconds

Development Tools IDE 1.x
1

Hi, I'm working on my personal UV exposer box for PCB. I want to automate the time count to start and stop UV tubes. I'm using the relay to turn ON/OFF the power source to tubes. Everything works fine except as it starts counting from time defined using potentiometer, the nodemcu resets.

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

//----------PIN ASSIGNEMENTS-----------//
#define LEDs D7          //LED Transistor Trigger Pin
#define buzzer D6        //Buzzer Pin
#define button D5        //Select Button Pin
#define durationPot A0   //Duration Knob Pin
//#define brightnessPot D8 //Brightness Knob Pin
//-------CONFIGURABLE PARAMETERS-------//
int 
maxTime = 1200,          //Maximum countdown timer time (in secs)      
buzzerFreq = 1000;       //Buzzer frequency (Hz, Change to customize tone)
//glowDelay = 10;          //Change this to increase LED glow rate (0-200)
//---SYSTEM VARIABLES (DO NOT TOUCH)---//
float 
timeLeftBarPercent = 0.00,
durationSecFloat = 0.00,
durationSecSelect = 0.00;
int
//whitePWM = 0,
duration = 0,
durationSec = 0,
//brightness = 0,
//brightnessPercent = 0,
//brightnessPWM = 0,
seconds = 0,
minutes = 0,
exposureLoop = 0,
startupLoop = 0;
unsigned long previousMillis = 0;    
const long interval = 1000;  
char timeMinSec[16];




//-VOID SETUP (Runs codes before entering loop)-//
void setup(){

  lcd.begin();

  lcd.backlight();
  pinMode(LEDs, OUTPUT);
  pinMode(buzzer, OUTPUT);
  // initialize the LCD
 
  lcd.clear();
  
  while(digitalRead(button)==LOW){
    lcd.setCursor(0,0);
    lcd.print("     PCB UV     ");
    lcd.setCursor(0,1);
    lcd.print("  Exposure Box  ");
     delay(2000);
  
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Firmware Version");
    delay(500);
    lcd.setCursor(0, 1);
    lcd.print("TechBuilder v3.1");
    delay(500);
    break;
  }
  lcd.clear();
}

//-VOID LOOP (Code that runs on repeat)-//
void loop(){
  //--Gather Duration Knob Readings--//
  duration = analogRead(durationPot);
  durationSec = map(duration,0,1023,0, maxTime);

  /*
  //--Gather Brightness Knob Readings--// 
  brightness = analogRead(brightnessPot);
  brightnessPercent = map(brightness,0,1023,0,100);
  brightnessPWM = map(brightness,0,1023,0,255);

  //--Control LED brightness in real time--// 
  analogWrite(LEDs,brightnessPWM);

      */
  minutes = durationSec/60;
  seconds = durationSec%60;
  
  lcd.setCursor(0,0);lcd.print("Duration: ");
  sprintf(timeMinSec,"%0.2d:%0.2d",minutes,seconds);
  lcd.setCursor(11,0);lcd.print(timeMinSec); 
 
 /*
  if(brightnessPercent<100){  //Used this instead of "lcd.clear();" function. Done to reduce LCD flicker.
    lcd.setCursor(14, 1);
    lcd.print(" ");
  }
  
      
  lcd.setCursor(0, 1);
  lcd.print("Brightness:     ");
  lcd.setCursor(12, 1);
  lcd.print(brightnessPercent);
  lcd.setCursor(15, 1);
  lcd.print("%"); 

*/
  
  if (digitalRead(button)==HIGH){
    durationSecSelect = durationSec;
    durationSecFloat = durationSec;
    
    lcd.clear();
    /*
    lcd.setCursor(0, 0);lcd.print(" Initializing  ");delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing.  ");tone(buzzer, buzzerFreq*3, 100);delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing.. ");tone(buzzer, buzzerFreq*3, 100);delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing...");tone(buzzer, buzzerFreq*3, 100);delay(500);
    */
    lcd.setCursor(0,0);lcd.print("    STARTING    ");
    lcd.setCursor(0, 1);
    for (int i=0; i <= 15; i++){ 
      lcd.print((char) 255);delay(35);
      tone(buzzer, buzzerFreq*2, 50);
    }
    lcd.print((char) 255);
    delay(300);
  // analogWrite(LEDs,brightnessPWM);    
 
    lcd.clear();  
    lcd.setCursor(0, 0);
    lcd.print("Time Left: ");

    while(exposureLoop==0){

      timeLeftBarPercent = 100*(durationSecFloat/durationSecSelect);
      
      unsigned long currentMillis = millis();
      if (currentMillis - previousMillis >= interval){
        previousMillis = currentMillis;

        minutes = durationSec/60;
        seconds = durationSec%60;

        sprintf(timeMinSec,"%0.2d:%0.2d", minutes, seconds);
        lcd.setCursor(11, 0);
        lcd.print(timeMinSec); 
         
        if(timeLeftBarPercent<2)        {for (int v=0; v <= 15; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}      
        else if(timeLeftBarPercent<6.25){for(int v=0; v <= 14; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<12.5){for(int v=0; v <= 13; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}  
        else if(timeLeftBarPercent<18.75){for(int v=0; v <= 12; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<25)   {for (int v=0; v <= 11; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<31.25){for(int v=0; v <= 10; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}  
        else if(timeLeftBarPercent<37.5) {for(int v=0; v <= 9; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<43.75){for(int v=0; v <= 8; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<50)   {for(int v=0; v <= 7; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}      
        else if(timeLeftBarPercent<56.25){for(int v=0; v <= 6; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<62.5) {for(int v=0; v <= 5; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<68.75){for (int v=0; v <= 4; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}    
        else if(timeLeftBarPercent<75)   {for (int v=0; v <= 3; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<81.25){for (int v=0; v <= 2; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<87.5) {for (int v=0; v <= 1; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<93.75){lcd.setCursor(0, 1);lcd.print((char) 255);}
        durationSec--;
        durationSecFloat--;
      }

      if(durationSec<=0){
        digitalWrite(LEDs,LOW);           //Turn off LEDs when countdown hits 0  
        tone(buzzer,3000,500);         
        lcd.setCursor(0,0);lcd.print("    Exposure    ");
        lcd.setCursor(0,1);lcd.print("    Finished    ");
        delay(500);lcd.clear();
        lcd.setCursor(0,0);lcd.print("  Press Button  ");
        lcd.setCursor(0,1);lcd.print("    To Start    ");
        delay(500);
        while(digitalRead(button)==LOW){}  //Press button to proceed with system restart
    /*  
        for (int i=0; i <= 255; i++){      //Glow-up Illumination LED
          analogWrite(LEDs,i);
          delay(glowDelay);
        }
        */
        lcd.clear(); 
        exposureLoop=1;
      }
      else if(digitalRead(button)==HIGH){
        digitalWrite(LEDs,LOW);
        tone(buzzer,3000,500);
        lcd.setCursor(0,0);lcd.print("   Cancelling   ");
        lcd.setCursor(0,1);lcd.print("    Process!    ");
        delay(750);       
        lcd.setCursor(0,0);lcd.print("    Exposure    ");
        lcd.setCursor(0,1);lcd.print("    Finished    ");
        delay(500);lcd.clear();
        lcd.setCursor(0,0);lcd.print("  Press Button  ");
        lcd.setCursor(0,1);lcd.print("    To Start    ");
        
/*        while(digitalRead(button)==LOW){}
      for (int i=0;i<=brightnessPWM;i++){ 
          analogWrite(LEDs,i);
          delay(glowDelay);
        }
    */
        lcd.clear();  
        exposureLoop=1;
      }
    } //End of While
    exposureLoop=0; 
  } //End Of Startup Button
  delay(20);
}//End of loop

Video Link: https://drive.google.com/file/d/13sFhu4S1CPtQmAqnGYUHBiW9hJq4cn04/view?usp=sharing

2

If your while loop exceeds 2.5s the wdt will reset the board. to reset the wdt insert

yield();

into the loop to executed scheduled tasks and reset the wdt.

delay();

also calls yield(); and there is a call to yield(); at the end of loop()

1 Like
3

Hello @Deva_Rishi, thanks for reply!

Can you please embed it in my code as I'm unable figure it out!

Thanks in advance!

4

Oh dear, well that inability is going to cause problems in the future.
I found 2 obvious ones

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

//----------PIN ASSIGNEMENTS-----------//
#define LEDs D7          //LED Transistor Trigger Pin
#define buzzer D6        //Buzzer Pin
#define button D5        //Select Button Pin
#define durationPot A0   //Duration Knob Pin
//#define brightnessPot D8 //Brightness Knob Pin
//-------CONFIGURABLE PARAMETERS-------//
int 
maxTime = 1200,          //Maximum countdown timer time (in secs)      
buzzerFreq = 1000;       //Buzzer frequency (Hz, Change to customize tone)
//glowDelay = 10;          //Change this to increase LED glow rate (0-200)
//---SYSTEM VARIABLES (DO NOT TOUCH)---//
float 
timeLeftBarPercent = 0.00,
durationSecFloat = 0.00,
durationSecSelect = 0.00;
int
//whitePWM = 0,
duration = 0,
durationSec = 0,
//brightness = 0,
//brightnessPercent = 0,
//brightnessPWM = 0,
seconds = 0,
minutes = 0,
exposureLoop = 0,
startupLoop = 0;
unsigned long previousMillis = 0;    
const long interval = 1000;  
char timeMinSec[16];




//-VOID SETUP (Runs codes before entering loop)-//
void setup(){

  lcd.begin();

  lcd.backlight();
  pinMode(LEDs, OUTPUT);
  pinMode(buzzer, OUTPUT);
  // initialize the LCD
 
  lcd.clear();
  
  while(digitalRead(button)==LOW){
    lcd.setCursor(0,0);
    lcd.print("     PCB UV     ");
    lcd.setCursor(0,1);
    lcd.print("  Exposure Box  ");
     delay(2000);
  
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Firmware Version");
    delay(500);
    lcd.setCursor(0, 1);
    lcd.print("TechBuilder v3.1");
    delay(500);
    break;
  }
  lcd.clear();
}

//-VOID LOOP (Code that runs on repeat)-//
void loop(){
  //--Gather Duration Knob Readings--//
  duration = analogRead(durationPot);
  durationSec = map(duration,0,1023,0, maxTime);

  /*
  //--Gather Brightness Knob Readings--// 
  brightness = analogRead(brightnessPot);
  brightnessPercent = map(brightness,0,1023,0,100);
  brightnessPWM = map(brightness,0,1023,0,255);

  //--Control LED brightness in real time--// 
  analogWrite(LEDs,brightnessPWM);

      */
  minutes = durationSec/60;
  seconds = durationSec%60;
  
  lcd.setCursor(0,0);lcd.print("Duration: ");
  sprintf(timeMinSec,"%0.2d:%0.2d",minutes,seconds);
  lcd.setCursor(11,0);lcd.print(timeMinSec); 
 
 /*
  if(brightnessPercent<100){  //Used this instead of "lcd.clear();" function. Done to reduce LCD flicker.
    lcd.setCursor(14, 1);
    lcd.print(" ");
  }
  
      
  lcd.setCursor(0, 1);
  lcd.print("Brightness:     ");
  lcd.setCursor(12, 1);
  lcd.print(brightnessPercent);
  lcd.setCursor(15, 1);
  lcd.print("%"); 

*/
  
  if (digitalRead(button)==HIGH){
    durationSecSelect = durationSec;
    durationSecFloat = durationSec;
    
    lcd.clear();
    /*
    lcd.setCursor(0, 0);lcd.print(" Initializing  ");delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing.  ");tone(buzzer, buzzerFreq*3, 100);delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing.. ");tone(buzzer, buzzerFreq*3, 100);delay(300);
    lcd.setCursor(0, 0);lcd.print(" Initializing...");tone(buzzer, buzzerFreq*3, 100);delay(500);
    */
    lcd.setCursor(0,0);lcd.print("    STARTING    ");
    lcd.setCursor(0, 1);
    for (int i=0; i <= 15; i++){ 
      lcd.print((char) 255);delay(35);
      tone(buzzer, buzzerFreq*2, 50);
    }
    lcd.print((char) 255);
    delay(300);
  // analogWrite(LEDs,brightnessPWM);    
 
    lcd.clear();  
    lcd.setCursor(0, 0);
    lcd.print("Time Left: ");

    while(exposureLoop==0){

      timeLeftBarPercent = 100*(durationSecFloat/durationSecSelect);
      
      unsigned long currentMillis = millis();
      if (currentMillis - previousMillis >= interval){
        previousMillis = currentMillis;

        minutes = durationSec/60;
        seconds = durationSec%60;

        sprintf(timeMinSec,"%0.2d:%0.2d", minutes, seconds);
        lcd.setCursor(11, 0);
        lcd.print(timeMinSec); 
         
        if(timeLeftBarPercent<2)        {for (int v=0; v <= 15; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}      
        else if(timeLeftBarPercent<6.25){for(int v=0; v <= 14; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<12.5){for(int v=0; v <= 13; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}  
        else if(timeLeftBarPercent<18.75){for(int v=0; v <= 12; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<25)   {for (int v=0; v <= 11; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<31.25){for(int v=0; v <= 10; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}  
        else if(timeLeftBarPercent<37.5) {for(int v=0; v <= 9; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<43.75){for(int v=0; v <= 8; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<50)   {for(int v=0; v <= 7; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}      
        else if(timeLeftBarPercent<56.25){for(int v=0; v <= 6; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<62.5) {for(int v=0; v <= 5; v++){  lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<68.75){for (int v=0; v <= 4; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}    
        else if(timeLeftBarPercent<75)   {for (int v=0; v <= 3; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<81.25){for (int v=0; v <= 2; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}} 
        else if(timeLeftBarPercent<87.5) {for (int v=0; v <= 1; v++){lcd.setCursor(v, 1);lcd.print((char) 255);}}   
        else if(timeLeftBarPercent<93.75){lcd.setCursor(0, 1);lcd.print((char) 255);}
        durationSec--;
        durationSecFloat--;
      }

      if(durationSec<=0){
        digitalWrite(LEDs,LOW);           //Turn off LEDs when countdown hits 0  
        tone(buzzer,3000,500);         
        lcd.setCursor(0,0);lcd.print("    Exposure    ");
        lcd.setCursor(0,1);lcd.print("    Finished    ");
        delay(500);lcd.clear();
        lcd.setCursor(0,0);lcd.print("  Press Button  ");
        lcd.setCursor(0,1);lcd.print("    To Start    ");
        delay(500);
        while(digitalRead(button)==LOW){ yield(); }  //Press button to proceed with system restart
   //always make sure that you reset the wdt in what could be an infinite loop.
    /*                       
        for (int i=0; i <= 255; i++){      //Glow-up Illumination LED
          analogWrite(LEDs,i);
          delay(glowDelay);
        }
        */
        lcd.clear(); 
        exposureLoop=1;
      }
      else if(digitalRead(button)==HIGH){
        digitalWrite(LEDs,LOW);
        tone(buzzer,3000,500);
        lcd.setCursor(0,0);lcd.print("   Cancelling   ");
        lcd.setCursor(0,1);lcd.print("    Process!    ");
        delay(750);       
        lcd.setCursor(0,0);lcd.print("    Exposure    ");
        lcd.setCursor(0,1);lcd.print("    Finished    ");
        delay(500);lcd.clear();
        lcd.setCursor(0,0);lcd.print("  Press Button  ");
        lcd.setCursor(0,1);lcd.print("    To Start    ");
        
/*        while(digitalRead(button)==LOW){}
      for (int i=0;i<=brightnessPWM;i++){ 
          analogWrite(LEDs,i);
          delay(glowDelay);
        }
    */
        lcd.clear();  
        exposureLoop=1;
      }
      yield();         // and put one before the end of the while loop
    } //End of While
    exposureLoop=0; 
  } //End Of Startup Button
  delay(20);
}//End of loop

The idea is fairly simple, and there is no harm in adding to many of them.

5

@Deva_Rishi Thanks a lot mate! Saved my time!

Thanks again!

6

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