Printing text to transparent OLED display

Components & Accessories Displays
1

Hello all, I recently acquired the TOLED breakout and have been successfully driving some basic images/animations to it using the HyperDisplay library, however I am having difficulties with the print function. Here is what I have tried doing, however nothing is displayed to the screen.

#include "HyperDisplay_UG2856KLBAG01.h"
#define WIRE_PORT Wire
UG2856KLBAG01_SPI myTOLED;
setup()
{ 
  WIRE_PORT.begin();
  myTOLED.begin(WIRE_PORT, false, SSD1309_ARD_UNUSED_PIN);
  Wire.setClock(400000);

  wind_info_t test;
  myTOLED.setWindowDefaults(&test);
  myTOLED.pCurrentWindow = &test;
  myTOLED.print("test");
}
loop()
{
}

I also tried the same thing without any window shenanigans. I believe I am missing something painfully obvious, but I am at a loss. Thanks in advance for assistance!

2

Hi evantheking01,

Which microcontroller are you using with the Transparent OLED? In order to use the default font in HyperDisplay, your microcontroller has to support the “<avr/pgmspace.h> header”. For example, if you are using the ESP32 Thing Plus like our [Hookup Guide demonstrates, the default font will not work since the ESP32 does not support the <avr/pgmspace.h> header. There are ways around this by modifying the library to either create a custom font or port the default font over but they’re a bit beyond the scope of that tutorial and our support here. The engineer who wrote the library gave a very detailed response with some tips to [this issue in the HyperDisplay GitHub repository that might help you get started porting over the default font or creating a new one if you are using a microcontroller that does not support the <avr/pgmspace.h> header.

If you are using the display with an AVR-based controller like an Arduino Mega 2560, then something else is causing the problem. If that’s the case, let me know and we can troubleshoot further.](Alternative Font Sizes · Issue #2 · sparkfun/SparkFun_HyperDisplay · GitHub)](https://learn.sparkfun.com/tutorials/transparent-graphical-oled-breakout-hookup-guide#software-setup-and-programming)

3

Hello TS-Mark,

I am using the esp32, so I will make my way over to the links you attached, thank you for the support!