Arduino: build a digital clock with DS3231 + OLED
Build a desk clock that never drifts: a DS3231 RTC keeps time, a 0.96 inch SSD1306 OLED shows it big. Two I2C devices on the same two wires, plus a button to set it.
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#oled
3 tutorials
ESP32: drive an SSD1306 OLED display over I2C
Wire a 128x64 OLED display (SSD1306) to an ESP32 and draw text, graphics, and sensor graphs. Smaller and brighter than the 16x2 LCD.
ESP32: build an indoor air quality monitor
BME280 + MQ-2 + MQ-135 + ESP32 + OLED = a complete indoor air quality monitor. Temperature, humidity, CO2 equivalent, and combustible gas.