Shields
In order to make it easier to develop and debug GEM, the following set of custom shields were designed. They also can be used to replicate test benches, used in examples.
There are four shields in total. Some of them are used to connect displays (e.g. ST7735 based display or compatible for Adafruit GFX version of GEM; KS0108 based display or compatible for U8g2 version of GEM), some as an input method (Keys shield for push-button interaction with the menu), some as both (Encoder shield can be used to connect rotary encoder as well as SH1106 based display or compatible for Adafruit GFX and U8g2 versions of GEM). Input shields can be stacked on top of the display shields.
Schematics, Fusion projects, Gerber files and SVGs (for DIY fabrication of boards) are provided.