ATTinyCore VS Tiny4kOLED

Resources I used: - How to Burn ATTiny85 Using Arduino-Mega As ISP : 5 Steps - Instructables - To program Arduino as an ISP. This was for my Arduino mega. There are a more than a few links for "normal" Arduinos if you google a bit. - GitHub - SpenceKonde/ATTinyCore: Arduino core for ATtiny 1634, 828, x313, x4, x41, x5, x61, x7 and x8 - arduino support for attiny microcontrollers.

You can code in Arduino using the ATTinyCore - https://github.com/SpenceKonde/ATTinyCore

Using this ATtiny85 board support building the 20 LED variant of the blink sketch in the Readme I get:

Install ATTinyCore package by Space Konde (author in video is using it). More info on ATTiny core github.

The Arduino core (i.e. the Arduino libraries) for the ATTiny85 (and a couple more ATTinys) is here and you can find the link for the ATTiny85 specific information a bit down the main page which, inside, includes this excelent refence picture.

After that go check the analogRead implementation in the ATTinyCore and the Arduino Samd core (it's in wiring_analog.c)

Finally, I used the Tiny4kOLED arduino library to display the pixels on the SSD1306 OLED display.

Now, for how to actually make the screen do what you want. This is the implementation of the bitmap function. This takes as its final parameter an address to some data in PROGMEM. When you make a call with a literal (e.g. oled.bitmap(..., 0x08);) you're telling it that the address to read the bitmap data from is in 0x08 PROGMEM3 .