Library gets stuck with OLED SSH1106 and Arduino UNO

[Alejandro13C]

Hi all,

I have connected Arduino UNO with ZDelivery 1,3" OLED Display I2C SSH1106 Chip 128 x 64.
I try to use a simple clock example but when i connect the Ardunio UNO at OLED.

5V --> 5V arduino.
GND--> GND Arduino.
SDA --> A4
SCL --> A5

#include <U8g2lib.h>
#include <Wire.h>

U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);

void setup(void) {
  Serial.begin(115200);
  u8g2.begin();  
}

uint8_t s = 00;
uint8_t m = 00;
uint8_t h = 00;

char s_str[3];
char m_str[3];
char h_str[3];

void loop(void) {

  strcpy(s_str, u8x8_u8toa(s, 2));		/* convert m to a string with two digits */
  strcpy(m_str, u8x8_u8toa(m, 2));		/* convert m to a string with two digits */
  strcpy(h_str, u8x8_u8toa(h, 2));		/* convert m to a string with two digits */
  u8g2.firstPage();
  do {
    u8g2.setFont(u8g2_font_ncenB10_tr);
    u8g2.drawStr(10,63,h_str);
    u8g2.drawStr(33,63,":");
    u8g2.drawStr(50,63,m_str);
    u8g2.drawStr(73,63,":");
    u8g2.drawStr(90,63,s_str);
    Serial.print("u8g2.nextPage(): "); Serial.println(u8g2.nextPage());
  } while ( u8g2.nextPage() );
  
  delay(1000);
  s++;
  if ( s == 60 )
  {
    s = 0;
    m++;
  }
  if ( m == 60 )
  {
    m = 0;
    h++;
  }
  if (h == 24)
  {
    h = 0;
  } 
}

The program is in stuck at this instruction.
while ( u8g2.nextPage() )
I had the same problem when i use "u8g2.sendBuffer();"
I see the issue onyl when i connect the oled to the Arduino.
I check the same OLED with ESP32 and i do not see any issue.
I check the same OLED with another Arduino UNO i reproduce the issue.
Could you help me?
Thanks!

[olikraus]

Your constructor
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);
seems to be wrong.

Use
U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);
or
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0,/* reset=*/ U8X8_PIN_NONE);

[Alejandro13C]

Hi @olikraus

This constructor does not work.
8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);
The code is not running with this.

With the other. U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0,/* reset=*/ U8X8_PIN_NONE);
I see the issue after 15 minutes

Regards

[olikraus]

Then? Is your problem solved?

[Alejandro13C]

Hi,
No, i still have the issue.
I check that when i disconnect only the SCL pin of the OLED display, the code is running.
Could be possible that the frecuency is not setting properly?

Some new Updates.

I change the wire between OLED and Arduino, i use a longer wire.
If i check the i2c address of the oled i see it:

2:05:40.295 -> Scanning... 12:05:40.295 -> I2C device found at address 0x3C ! 12:05:40.295 -> done

But if i try to run the clock example, the code get stuck at : u8g2.begin();

Thanks!

[olikraus]

But if i try to run the clock example, the code get stuck at : u8g2.begin();

Looks like you need a 10K pullup resistor for the I2C bus.

[Alejandro13C]

Hi,

I use a 10k pullup with external powersupply and the code is stuck at the same point.
:(

Regards,

[olikraus]

Hmm.. I never heard, that the "SW_I2C" can cause such trouble. Strange...

[Alejandro13C]

Hi Again,
I did again the code with all your indication.
And again i see the same issue.
At hw level i put 2k pull up reistir to SCL and SDA.
I tried to use this but it does not work
U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);

It seems that i lost the SDA and the Screen get frozen.
I put some prints and i see the issue in this point.
} while ( u8g2.nextPage() );

Code.

U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0,/* reset=*/ U8X8_PIN_NONE);
//U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,4,5, /* reset=*/ U8X8_PIN_NONE);

void setup(void) {
  Serial.begin(115200);
  u8g2_SetI2CAddress(u8g2.getU8g2(), 0x3C * 2);
  u8g2.begin();
  //Display Renault Logo during 3 secs.
  Logo_Renault();

  //Only to test
  Battery_sensor = 780;
  Vdo_sensor = 170;
}

void loop(void) {
  //Only to test.
  Vdo_sensor++;

  // ADC.
  //Battery_sensor = analogRead(A0); //Read Analog battery sensor
  //Vdo_sensor = analogRead(A1); //Read Analog VDO sensor

  /* Conversion of counts --> batery voltage and counts --> oil pressure.*/
  Voltage = Battery_sensor * bit_volt; //Conversion from bit to volts to have the voltage divisor.
  Vbat = Voltage * k_bat; //Conversion from voltage divisor to Battery voltage.
  if(Vdo_sensor < 173 || Vdo_sensor > 800) { Vdo_sensor = 172; } //Limit of sensor 171 samples is 10 ohmios, 800 samples is 184 ohmios.
  Voltage_oil = Vdo_sensor * bit_volt; //Conversion from bit to volts to have the voltage divisor.
  Resistor_VDO = ((50.05*Voltage_oil)/(5.23-Voltage_oil)); // Resistence from the voltage divisor.
  Oil_pressure = (-0.471 + (0.0459*Resistor_VDO) + (3.79*pow(10.0,-5.0))*pow(Resistor_VDO,2.0) + ((1.16*pow(10.0,-7.0))*pow(Resistor_VDO,3.0))); //Funtion to conver resistence into pressure.
  
  SerialLogger();
  u8g2.firstPage();

  do
  {
    u8g2.setFont(u8g2_font_profont22_tf);	// choose a suitable font
    if(Vbat < 12.4) //If the battery is less than 12.4, show battery voltage.
    {
      dtostrf(Vbat, 4, 2, Battery_char); //Converts from float to const char
      u8g2.drawStr(35 , 60, Battery_char);
      u8g2.drawStr(85 , 60 , "V");
      u8g2.drawXBMP(48, 2, 40, 40, BatteryLogo);
    } else { // Else how Oil pressure value.
      dtostrf(Oil_pressure, 4, 2, OP_char);
      u8g2.drawStr(25,60, OP_char);
      u8g2.drawStr(75 , 60 , "Bar");
      u8g2.drawXBMP(48, 10, 32, 32, OilLogo);
    } 
  }while (u8g2.nextPage());
  delay(500);
}

//Functions to display Logos.
void Logo_Renault(void)
{
  // Display Reanult Logo during 10s
  u8g2.clearBuffer();
  u8g2.drawXBMP(0, 16, 128, 34, RenaultLogo);
  u8g2.sendBuffer();
  delay(2000);
  u8g2.clearBuffer(); // clear the internal memory
}

Update, i will check this constructor.

U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);

Thanks in advance!