A thermostat with an OLED capable of plugging into a USB port.
You want to attach the DigiSpark ATtiny85 to a tiny OLED (128x32 pixels) and make it use easily readable, huge fonts (16x32 pixels WxH)?
This is the 2nd tutorial on my ESP32 learning journey. Here, an OLED shows time and captured data by DHT sensor (temperature & humidity).
Application notes for Pmod OLED and Arduino Uno. In this app, a cloud of points is displayed randomly, then a flashing message will appear.