Quantity   Component name
1 × Mega 2560 PRO (Embed) CH340G
1 × Adafruit ItsyBitsy nRF52840 Express https://www.adafruit.com/product/4481
1 × Adafruit Bi-directional logic level converter https://www.adafruit.com/product/757
1 × OLED with driver module https://hackaday.io/project/173753-oled-breakout-board-with-dc-dc-step-up