Quantity   Component name
1 × Arduino Leonardo / ProMicro / Seeeduino XIAO ATSAMD21 / ESP8266 / ESP32 / Seeed Studio SAMD21 MCU: https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html
1 × i2C SSD1306 or i2C SH1106 OLED Display