Cheap ssd1306 oleds not showing i2c address

Using Arduino Displays
1

Hello all, ive recently tried to start a project for a car that im building to make a digital boost gauge with an arduino uno and a .96 oled screen. Using i2c address locating code, i could not find them at all. I figured out that they work on the ug8 library rather than ssd1306. I have code compiled that i found somewhere else, that i planned to just use for now and then modify it to fit my needs a little better. Im very new to programming other than a few classes in school 20+ years ago and lots of html experience around the same time frame. My questions are, is there an easy way to convert this code to work with the ug8 library, or does someone have a link for actual ssd1306 oled screens? I got the ones that i have right now on ebay, but again they were labeled as ssd1306, and i have spent a few weeks trying to get them to work, only to finally get them to power up and work with an example from the ug8lib. heres the code im trying to run. Its a boost gauge with dual ls3 map sensors, one for atmospheric pressure, one for boost.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define sensorPin A0
#define refPin A2
#define WINDOW_SIZE 6

#define LOGO_HEIGHT   64
#define LOGO_WIDTH    128

// 'vw128x64', 128x64px
const unsigned char VWround [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0x80, 0x00, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xff, 0x80, 0x00, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x1f, 0xc0, 0x03, 0xfc, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x0f, 0xe0, 0x03, 0xf8, 0x3f, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x01, 0xf0, 0x07, 0xf0, 0x07, 0xf0, 0x0f, 0xc0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x07, 0xe0, 0x07, 0xf8, 0x0f, 0xe0, 0x03, 0xf0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x0f, 0xe0, 0x03, 0xfc, 0x1f, 0xc0, 0x03, 0xf8, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1f, 0xe0, 0x01, 0xfc, 0x3f, 0x80, 0x07, 0xfc, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x3f, 0xf0, 0x00, 0xfe, 0x7f, 0x00, 0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x3f, 0xf8, 0x00, 0x7f, 0xff, 0x00, 0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7d, 0xfc, 0x00, 0x3f, 0xfe, 0x00, 0x1f, 0xff, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7c, 0xfc, 0x00, 0x1f, 0xfc, 0x00, 0x3f, 0x9f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7c, 0x7e, 0x00, 0x1f, 0xf8, 0x00, 0x7f, 0x1f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xfc, 0x3f, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x1f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xfc, 0x3f, 0x80, 0x0f, 0xf8, 0x01, 0xfc, 0x1f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7c, 0x1f, 0xc0, 0x1f, 0xfc, 0x01, 0xf8, 0x1f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7c, 0x0f, 0xe0, 0x3f, 0xfc, 0x03, 0xf8, 0x1f, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x7e, 0x07, 0xf0, 0x7f, 0xfe, 0x07, 0xf0, 0x3e, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x3e, 0x03, 0xf0, 0xff, 0x7f, 0x0f, 0xe0, 0x3e, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1f, 0x03, 0xf8, 0xfe, 0x3f, 0x9f, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x0f, 0x80, 0xff, 0xfc, 0x1f, 0xff, 0x80, 0xf8, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x07, 0xc0, 0x7f, 0xf8, 0x0f, 0xff, 0x01, 0xf0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x7f, 0xf0, 0x07, 0xfe, 0x07, 0xe0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x01, 0xf8, 0x3f, 0xe0, 0x03, 0xfc, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x0f, 0xc0, 0x03, 0xf8, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xef, 0x80, 0x01, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0x80, 0x00, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

//---------------

int OLED_RESET = 4;
Adafruit_SSD1306 display(OLED_RESET); //driver for the screen

// bar graph

float rawval = 0; // Setup raw sensor value
float refval = 0; // Setup raw refernce sensor value
float barboost = 0; // Setup value for boost bar
float realboost = 0; // Setup value for  real boost

int INDEX = 0;
int VALUE = 0;
int SUM = 0;
int READINGS[WINDOW_SIZE];
int AVERAGED = 0;


byte count;
byte sensorArray[128];
byte drawHeight;
boolean filled = 0; //decide either filled, or dot-display. 0==dot display.

void VWlogo() {
  display.clearDisplay();
  display.drawBitmap(0, 0, VWround, LOGO_WIDTH, LOGO_HEIGHT, 1);
  display.display();
  delay(1500);
}

void setup()
{
  delay(250);
  Serial.begin(9600); // start monitoring raw voltage for calibration
  display.begin(SSD1306_SWITCHCAPVCC); // 3.3V power supply
  display.clearDisplay(); // Clear the display and ram
  display.display();
  VWlogo();
  delay(2000); // display Adafruit logo for 2 seconds
  for (count = 0; count <= 128; count++) //zero all elements
  {
    sensorArray[count] = 0;
  }
}


void loop() // Start loop
{
  analogRead(sensorPin);
  int boost1 = map(analogRead(sensorPin), 21, 961, 100, 2600);
  analogRead(refPin);
  int boost2 = map(analogRead(refPin), 21, 961, 100, 2600);

  int boostmbar = boost1 - boost2;
  rawval = (analogRead(A0) - analogRead (A2)); // Read MAP sensor raw value on analog port 0

  SUM = SUM - READINGS[INDEX];       // Remove the oldest entry from the sum
  VALUE = boostmbar * 1.215;        // Read the next sensor value
  READINGS[INDEX] = VALUE;           // Add the newest reading to the window
  SUM = SUM + VALUE;                 // Add the newest reading to the sum
  INDEX = (INDEX + 1) % WINDOW_SIZE; // Increment the index, and wrap to 0 if it exceeds the window size

  AVERAGED = SUM / WINDOW_SIZE;      // Divide the sum of the window by the window size for the result

  barboost = ((rawval * 0.19)  + 10); // Calculate boost value for the graph

  drawHeight = map((analogRead(A0) - analogRead(A2)), 0, 1023, 0, 25 );

  sensorArray[0] = drawHeight;

  for (count = 55; count <= 128; count++ )
  {
    if (filled == false)
    {
      display.drawPixel(count, 71 - sensorArray[count - 55], WHITE);
    }
    else
      display.drawLine(count, 1, count, 71 - sensorArray[count - 55], WHITE);
  }

  for (count = 80; count >= 2; count--) // count down from 160 to 2
  {
    sensorArray[count - 1] = sensorArray[count - 2];
  }

  display.fillRect(0, 0, barboost, 4, WHITE); // Draws the bar depending on the sensor value
  display.setTextSize(1);
  display.setCursor(97, 20);
  display.println("BOOST");
  display.setTextColor(WHITE);
  display.setTextSize(3);
  display.setCursor(0, 10);
  display.println(((AVERAGED * 0.001) * 14) + 0.12);
  delay(1);
  display.display();
  display.clearDisplay();
  delay(10); // delay between numbers
}
2

Did you use pull ups on the I2C lines?

Please remember to use code tags when posting code

3

first off, thank you for the response! I apologize, i do not know what you mean by code tags. Yes i have pull up resistors. The screens work perfectly using ug8lib with no issues. i also have an sh1106 1.2" screen, that does work fine with adafruit 110x library, but again, i haven't had any luck changing the code for the gauge to work with the 110x library.

4

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 </> icon above the compose window) to make it easier to read and copy for examination

5

thank you. fixed the code tag.

6

You display has the "no ack" issue: https://forum.arduino.cc/t/using-hw-i2c-with-ssd1306-display-no-ack/697448

7

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