It works on the teensy 3.6 without Pullup-Resistors. Perhaps they are inside the OLED-Baords.
I use 2 cheap OLED-Boards with 4 Pins each, GND, VCC, SCL and SCA.
Both use the same I2C-Address but they use different I2C-Ports.
I thought that it is much more complex, but finally it was very easy to do.
Here is the code that works fine:
I dropped the code here because there where no running examples with code available.
Perhaps add this to the examples.
I use 2 cheap OLED-Boards with 4 Pins each, GND, VCC, SCL and SCA.
Both use the same I2C-Address but they use different I2C-Ports.
I thought that it is much more complex, but finally it was very easy to do.
Here is the code that works fine:
Code:
/**************************************************************************
Example to connect 2 I2C SSD1106-OLEDs to Teensy 3.6
Both OLEDs have the same size in my case 128x64 Pixels
**************************************************************************/
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
// Display 0 on PINs 18/19
Adafruit_SSD1306 dp0(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// Display 1 on Pins 37/38
Adafruit_SSD1306 dp1(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire1, OLED_RESET);
void setup() {
Serial.begin(9600);
// Perhaps these lines are not needed, I have only tested with these
Wire.setSDA(15);
Wire.setSCL(19);
Wire1.setSDA(37);
Wire1.setSCL(38);
if(!dp1.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
Serial.println(F("SSD1306 Display1 allocation failed"));
for(;;); // Don't proceed, loop forever
}
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if(!dp0.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
Serial.println(F("SSD1306 Display 0 allocation failed"));
for(;;); // Don't proceed, loop forever
}
// Show initial display buffer contents on the screen --
// the library initializes this with an Adafruit splash screen.
dp0.display();
delay(200); // Pause for 2 seconds
dp0.clearDisplay();
dp1.display();
delay(200); // Pause for 2 seconds
// Clear the buffer
dp1.clearDisplay();
delay(1000);
// Draw a single pixel in white
dp0.drawPixel(10, 10, WHITE);
dp1.drawPixel(10, 10, WHITE);
// Show the display buffer on the screen. You MUST call display() after
// drawing commands to make them visible on screen!
dp0.display();
dp1.display();
delay(200);
// display.display() is NOT necessary after every single drawing command,
// unless that's what you want...rather, you can batch up a bunch of
// drawing operations and then update the screen all at once by calling
// display.display(). These examples demonstrate both approaches...
testdrawchar(); // Draw characters of the default font
testdrawstyles(); // Draw 'stylized' characters
dp0.clearDisplay();
dp1.clearDisplay();
}
void loop() {
}
void testdrawchar(void) {
dp0.clearDisplay();
dp0.setTextSize(1); // Normal 1:1 pixel scale
dp0.setTextSize(1); // Normal 1:1 pixel scale
dp0.setTextColor(WHITE); // Draw white text
dp0.setCursor(0, 0); // Start at top-left corner
dp0.cp437(true); // Use full 256 char 'Code Page 437' font
// Not all the characters will fit on the display. This is normal.
// Library will draw what it can and the rest will be clipped.
for(int16_t i=0; i<256; i++) {
if(i == '\n') dp0.write(' ');
else dp0.write(i);
}
dp0.display();
delay(20);
dp1.clearDisplay();
dp1.setTextSize(1); // Normal 1:1 pixel scale
dp1.setTextSize(1); // Normal 1:1 pixel scale
dp1.setTextColor(WHITE); // Draw white text
dp1.setCursor(0, 0); // Start at top-left corner
dp1.cp437(true); // Use full 256 char 'Code Page 437' font
// Not all the characters will fit on the display. This is normal.
// Library will draw what it can and the rest will be clipped.
for(int16_t i=0; i<256; i++) {
if(i == '\n') dp1.write(' ');
else dp1.write(i);
}
dp1.display();
delay(200);
}
void testdrawstyles(void) {
// Change Display 0
dp0.clearDisplay();
dp0.setTextSize(1); // Normal 1:1 pixel scale
dp0.setTextColor(WHITE); // Draw white text
dp0.setCursor(0,0); // Start at top-left corner
dp0.println(F("Display 0 works!"));
dp0.setTextColor(BLACK, WHITE); // Draw 'inverse' text
dp0.println(3.141592);
dp0.setTextSize(2); // Draw 2X-scale text
dp0.setTextColor(WHITE);
dp0.print(F("0x"));
dp0.println(0xDEADBEEF, HEX);
dp0.display();
delay(200);
// Same on Display 1
dp1.clearDisplay();
dp1.setTextSize(1); // Normal 1:1 pixel scale
dp1.setTextColor(WHITE); // Draw white text
dp1.setCursor(0,0); // Start at top-left corner
dp1.println(F("Display 1 works!"));
dp1.setTextColor(BLACK, WHITE); // Draw 'inverse' text
dp1.println(3.141592);
dp1.setTextSize(2); // Draw 2X-scale text
dp1.setTextColor(WHITE);
dp1.print(F("0x"));
dp1.println(0xDEADBEEF, HEX);
dp1.display();
delay(2000);
}
/*
void testdrawpot1(void) {
// draw outer ring
dp0.
// draw marker on pot
dp0.
}
*/
I dropped the code here because there where no running examples with code available.
Perhaps add this to the examples.
Last edited: