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#define EXT_I2C_SDA 21
#define EXT_I2C_SCL 5
const int extCenterX = 64;
const int extCenterY = -70;
void initExtDisplay();
void pixelOnExtDisplay(int16_t x, int16_t y);
void lineCalcOnExtDisplay(int16_t x, int16_t y, int radius);
void overlayOnExtDisplay();
float valueOnExtDisplay(float value);
void drawLineExtDisplay(float value);
void changeExt(float value);