Micro I2C-Scanner with 0.96" OLED and ATtiny85
This is a re-implementation of the elektor labs project Micro I2C-Scanner with 0.96" Oled and ATtiny44. At first I tried to port the tiny44 project to a tiny85, but was unable to make it work on a digispark clone. The original implementation used some clever coding to fit the application on the tiny44. Unfortunately, this made it hard to modify.
Besides the different uC, this implementation intends to address some issues I had the original tiny44 project:
- swap between 7bit I2C addresses and even 8bit addresses (original)
- use an external library to handle the OLED
The tinyFont branch re-implements the exact functionality of the elektor labs project.
It uses the background bitmap and some lines of code from original project, and therefore the original license is kept.
The tinusaur branch contains a simpler implementation which does not require a background bitmap,
and relies on printed text (on a sticker) placed around of the OLED display.
The tinyFont and tinusaur branches rely on the tinusaur ssd1306xled
library. They ose only a small fraction of the tiny85 memory.
The master branch uses the u8g2 library. It uses nearly all the tiny85 memory
(~83% data, ~98% program) to fit the headers for the address upper/lower nibbles.
On 8x8 character mode (USE_U8X8 flag) the memory consumption is reduced
(~40% data, ~60% program), but the address headers share the space with the
first row/columns of the found/no-found indicators.
The exact memory usage mainly determined by the u8g2 library version.
After U8g2@2.24.3 the program does not logger fits without the USE_U8X8 flag.
On all branches the I2C scanning function on the tiny85 is built around the TinyWireM library.
The master branch also contains build environments for the 3.3V/8Mhz version of the
arduino pro-mini. See the project configuration file for more details.