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I2C & SPI https://learn.adafruit.com/monochrome-oled-breakouts/downloads Adafruit SSD1306 OLED 1.3 inch 128x64 I2C & SPI https://learn.adafruit.com/monochrome-oled-breakouts/downloads Adafruit SSD1306 OLED 1.3 inch 128x64 I2C & SPI https://learn.adafruit.com/monochrome-oled-breakouts/downloads Adafruit SSD1306 OLED 1.3 inch 128x64 I2C & SPI https://learn.adafruit.com/monochrome-oled-breakouts/downloads Adafruit SSD1306 OLED 1.3 inch 128x64 I2C & SPI CR2013-MI2120 ILI9341 LCD Breakout LCD-graphical display with a more complex module, several variations on the bottom //connect that to the front panel. Possibly do as an external CV-to-pulse-rate module? Is this even useful? - Seven-segment display. Can be done, but requires a lot of controls for this. // please feel free to improve on this one, how much smoothing to apply CC0 to the author/donor to decide if he or she is willing to distribute the Covered Software under this License. 5.