U8g2 Display doesnt Work as it should

manufi · February 13, 2025, 4:52pm

Hi, im new and I have a project in which I want to build a sonar, but I have a problem, the output values on the display, which are supposed to show the distance, change much too slowly and lag, but I don't understand why that is please help me im very frustrated.
Sry for my bad english

#include "U8g2lib.h"
#define Echopin 13
#define Trigpin 12
#define SERVOPIN 10
#include "Servo.h"
#include "HCSR04.h"
#define Buzzer 9

// 1,3 Zoll SH1106
 U8G2_SH1106_128X64_NONAME_F_HW_I2C oled(U8G2_R0);
UltraSonicDistanceSensor Abstandssensor (Trigpin,Echopin);


Servo Servomotor;
byte Servowinkel = 0;
int Serv = 0;
unsigned long previousMillis = 0;//für den Timer
const long intervall = 30;//für den Timer

void setup() 
{
  oled.setBusClock(100000);
  oled.begin();
  oled.clearBuffer();
  Serial.begin(9600);
  Servomotor.attach(SERVOPIN);
  pinMode(Buzzer,OUTPUT);
  digitalWrite(Buzzer,0);
  Servomotor.write (0);
}

void loop() 
{
 
 
  //Zeichnen der Benutzeroberfläche OLED:

  oled.setDrawColor(1);// Farbe weiß
  
   
  oled.firstPage();
  do 
  {
  
   oled.drawRFrame(0, 0, 128, 64, 3); //Rahmen
   oled.setFont(u8g2_font_helvB12_tf); //12 px
   oled.drawStr(2,15,"Sonar:");
   oled.drawLine(3,18,51,18); //Unterschrift von "Sonar"

   //Radar:
   oled.drawCircle(65,62, 34, U8G2_DRAW_UPPER_RIGHT);//Großer Kreis Rechts
   oled.drawCircle(63,62,34,U8G2_DRAW_UPPER_LEFT); //Großer Kreis Links

   oled.drawCircle(65,62, 24, U8G2_DRAW_UPPER_RIGHT); //Mittlerer Kreis Rechts
   oled.drawCircle(63,62,24,U8G2_DRAW_UPPER_LEFT);//Mittlerer Kreis Links

    oled.drawCircle(65,62, 14, U8G2_DRAW_UPPER_RIGHT);//Kleiner Kreis Rechts
   oled.drawCircle(63,62,14,U8G2_DRAW_UPPER_LEFT);//Kleiner Kreis Rechts

   oled.drawLine(64,62,64,25);//Mittlere Linie
   oled.drawLine(64,62,36,36);//Linke Linie
   oled.drawLine(64,62,92,36);//Rechte Linie

   oled.drawFrame(79,3,46,15);//Rechteck cm anzeige
   
   //damit cm immer direkt eine Freizeile hinter der entfernung steht 
  unsigned long currentMillis = millis();
  if((currentMillis-previousMillis)>= intervall){//delay
  previousMillis = currentMillis;
   int Abstand = Abstandssensor.measureDistanceCm();
   oled.setFont(u8g2_font_ncenB08_tr);
   if(Abstand<=99){
   if(Abstand<10){
   oled.drawStr(88,14,"cm");
   }
   else{
   oled.drawStr(94,14,"cm");
   }
   }
   else{
   oled.drawStr(82,14,"no");
   }
  }
  // x Koordinaten Radar OLED Display Start: 31 Ende: 99
  // y Koordinaten Radar OLED Display Start: 25 Ende: 62

  for(int Serv= 0; Serv<= 165;Serv++) // Servomotor geht nur dreht nur bis 165 alles danach ist quasi wie delay
{
Servomotor.write(Serv);
delay(10);
unsigned long currentMillis = millis();
if((currentMillis-previousMillis)>= intervall){//delay
previousMillis = currentMillis;
int Abstand = Abstandssensor.measureDistanceCm();
if(Abstand<30){
oled.setCursor(82,14);
oled.setFont(u8g2_font_ncenB08_tr);
oled.print(Abstand);
Serial.print(Abstand);
Serial.println();
}
}
}


for(int Serv=165; Serv>0;Serv--) //for schleife wird solange ausgeführt bis sie false ist dann geht es erst weiter
{
Servomotor.write(Serv);
delay(10);
unsigned long currentMillis = millis();
if((currentMillis-previousMillis)>= intervall){//delay
previousMillis = currentMillis;
int Abstand = Abstandssensor.measureDistanceCm();
if(Abstand<30){
oled.setCursor(82,14);
oled.setFont(u8g2_font_ncenB08_tr);
oled.print(Abstand);
Serial.print(Abstand);
Serial.println();
}
}
}


   
    
  


  
  }
  while (oled.nextPage());
  
}

PaulRB · February 13, 2025, 5:59pm

Have you tried 400000 ?

PaulRB · February 13, 2025, 6:00pm

Please Auto-Format your code and re-post it. It is difficult to follow with such poor indentation.

PaulRB · February 13, 2025, 6:04pm

The OLED will not be updated until this line is executed.

Before that line can be executed, your code executes 2x for-loops that repeat 165 times and delay 10ms in each loop.

So your display will only update once every 3~3.5 seconds.

manufi · February 13, 2025, 8:34pm

Yes it changes nothing

manufi · February 13, 2025, 8:35pm

#include "U8g2lib.h"
#include "Servo.h"
#include "HCSR04.h"

#define Echopin 13
#define Trigpin 12
#define SERVOPIN 10

// 1,3 Zoll SH1106
U8G2_SH1106_128X64_NONAME_1_HW_I2C oled(U8G2_R0);
UltraSonicDistanceSensor Abstandssensor(Trigpin, Echopin);


Servo Servomotor;
int Serv = 0;

void setup() {
  oled.setBusClock(400000);
  oled.begin();
  oled.clearBuffer();
  Serial.begin(9600);
  Servomotor.attach(SERVOPIN);
  Servomotor.write(0);
}

void loop() {


  //Zeichnen der Benutzeroberfläche OLED:

  oled.setDrawColor(1);  // Farbe weiß


  oled.firstPage();
  do {

    oled.drawRFrame(0, 0, 128, 64, 3);   //Rahmen
    oled.setFont(u8g2_font_helvB12_tf);  //12 px
    oled.drawStr(2, 15, "Sonar:");
    oled.drawLine(3, 18, 51, 18);  //Unterschrift von "Sonar"

    //Radar:
    oled.drawCircle(65, 62, 34, U8G2_DRAW_UPPER_RIGHT);  //Großer Kreis Rechts
    oled.drawCircle(63, 62, 34, U8G2_DRAW_UPPER_LEFT);   //Großer Kreis Links

    oled.drawCircle(65, 62, 24, U8G2_DRAW_UPPER_RIGHT);  //Mittlerer Kreis Rechts
    oled.drawCircle(63, 62, 24, U8G2_DRAW_UPPER_LEFT);   //Mittlerer Kreis Links

    oled.drawCircle(65, 62, 14, U8G2_DRAW_UPPER_RIGHT);  //Kleiner Kreis Rechts
    oled.drawCircle(63, 62, 14, U8G2_DRAW_UPPER_LEFT);   //Kleiner Kreis Rechts

    oled.drawLine(64, 62, 64, 25);  //Mittlere Linie
    oled.drawLine(64, 62, 36, 36);  //Linke Linie
    oled.drawLine(64, 62, 92, 36);  //Rechte Linie

    oled.drawFrame(79, 3, 46, 15);  //Rechteck cm anzeige




    // x Koordinaten Radar OLED Display Start: 31 Ende: 99
    // y Koordinaten Radar OLED Display Start: 25 Ende: 62

    for (int Serv = 0; Serv <= 165; Serv++)  // Servomotor geht nur dreht nur bis 165 alles danach ist quasi wie delay
    {
      Servomotor.write(Serv);
      delay(10);
      int Abstand = Abstandssensor.measureDistanceCm();
      if (Abstand < 30) {
        oled.setFont(u8g2_font_ncenB08_tr);
        if (Abstand <= 99) {
          if (Abstand < 10) {
            oled.drawStr(88, 14, "cm");  //damit cm immer direkt eine Freizeile hinter der entfernung steht
          } else {
            oled.drawStr(94, 14, "cm");
          }
        } else {
          oled.drawStr(82, 14, "no");
        }

        oled.setCursor(82, 14);

        oled.print(Abstand);
        Serial.print(Abstand);
        Serial.println();
      }
    }


    for (int Serv = 165; Serv > 0; Serv--)  //for schleife wird solange ausgeführt bis sie false ist dann geht es erst weiter
    {
      Servomotor.write(Serv);
      delay(10);
      int Abstand = Abstandssensor.measureDistanceCm();
      oled.setFont(u8g2_font_ncenB08_tr);
      if (Abstand < 30) {
        if (Abstand <= 99) {
          if (Abstand < 10) {
            oled.drawStr(88, 14, "cm");  //damit cm immer direkt eine Freizeile hinter der entfernung steht
          } else {
            oled.drawStr(94, 14, "cm");
          }
        } else {
          oled.drawStr(82, 14, "no");
        }

        oled.setCursor(82, 14);

        oled.print(Abstand);
        Serial.print(Abstand);
        Serial.println();
      }
    }







  }

  while (oled.nextPage());
}

PaulRB · February 13, 2025, 9:28pm

Having read your code in more detail, I agree, increasing the i2c clock will make no difference.

The problem is the way you have structured your code.

Try this

#include "U8g2lib.h"
#include "Servo.h"
#include "HCSR04.h"

#define Echopin 13
#define Trigpin 12
#define SERVOPIN 10

// 1,3 Zoll SH1106
U8G2_SH1106_128X64_NONAME_1_HW_I2C oled(U8G2_R0);
UltraSonicDistanceSensor Abstandssensor(Trigpin, Echopin);


Servo Servomotor;
int Serv = 0;

void setup() {
  oled.setBusClock(400000);
  oled.begin();
  oled.clearBuffer();
  Serial.begin(9600);
  Servomotor.attach(SERVOPIN);
  Servomotor.write(0);
}

void loop() {


  //Zeichnen der Benutzeroberfläche OLED:

  oled.setDrawColor(1);  // Farbe weiß

    oled.drawRFrame(0, 0, 128, 64, 3);   //Rahmen
    oled.setFont(u8g2_font_helvB12_tf);  //12 px
    oled.drawStr(2, 15, "Sonar:");
    oled.drawLine(3, 18, 51, 18);  //Unterschrift von "Sonar"

    //Radar:
    oled.drawCircle(65, 62, 34, U8G2_DRAW_UPPER_RIGHT);  //Großer Kreis Rechts
    oled.drawCircle(63, 62, 34, U8G2_DRAW_UPPER_LEFT);   //Großer Kreis Links

    oled.drawCircle(65, 62, 24, U8G2_DRAW_UPPER_RIGHT);  //Mittlerer Kreis Rechts
    oled.drawCircle(63, 62, 24, U8G2_DRAW_UPPER_LEFT);   //Mittlerer Kreis Links

    oled.drawCircle(65, 62, 14, U8G2_DRAW_UPPER_RIGHT);  //Kleiner Kreis Rechts
    oled.drawCircle(63, 62, 14, U8G2_DRAW_UPPER_LEFT);   //Kleiner Kreis Rechts

    oled.drawLine(64, 62, 64, 25);  //Mittlere Linie
    oled.drawLine(64, 62, 36, 36);  //Linke Linie
    oled.drawLine(64, 62, 92, 36);  //Rechte Linie

    oled.drawFrame(79, 3, 46, 15);  //Rechteck cm anzeige

    oled.sendBuffer();


    // x Koordinaten Radar OLED Display Start: 31 Ende: 99
    // y Koordinaten Radar OLED Display Start: 25 Ende: 62

    for (int Serv = 0; Serv <= 165; Serv++)  // Servomotor geht nur dreht nur bis 165 alles danach ist quasi wie delay
    {
      Servomotor.write(Serv);
      delay(10);
      int Abstand = Abstandssensor.measureDistanceCm();
      if (Abstand < 30) {
        oled.setFont(u8g2_font_ncenB08_tr);
        if (Abstand <= 99) {
          if (Abstand < 10) {
            oled.drawStr(88, 14, "cm");  //damit cm immer direkt eine Freizeile hinter der entfernung steht
          } else {
            oled.drawStr(94, 14, "cm");
          }
        } else {
          oled.drawStr(82, 14, "no");
        }

        oled.setCursor(82, 14);

        oled.print(Abstand);
        oled.sendBuffer();
        Serial.print(Abstand);
        Serial.println();
      }
    }


    for (int Serv = 165; Serv > 0; Serv--)  //for schleife wird solange ausgeführt bis sie false ist dann geht es erst weiter
    {
      Servomotor.write(Serv);
      delay(10);
      int Abstand = Abstandssensor.measureDistanceCm();
      oled.setFont(u8g2_font_ncenB08_tr);
      if (Abstand < 30) {
        if (Abstand <= 99) {
          if (Abstand < 10) {
            oled.drawStr(88, 14, "cm");  //damit cm immer direkt eine Freizeile hinter der entfernung steht
          } else {
            oled.drawStr(94, 14, "cm");
          }
        } else {
          oled.drawStr(82, 14, "no");
        }

        oled.setCursor(82, 14);

        oled.print(Abstand);
        oled.sendBuffer();
        Serial.print(Abstand);
        Serial.println();
      }
    }
}

PaulRB · February 13, 2025, 10:03pm

There are other problems with your code.

For example:

      if (Abstand < 30) {
        if (Abstand <= 99) {

If a value is less than 30, it must also be less than 99, so why test it against 99?

system · August 12, 2025, 10:04pm

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