OLED Shield is a I2C screen 0.66" across.
OLED
Features:
Pin:
| D1 mini | Shield |
| D1 | SCL |
| D2 | SDA |
Arduino Code:
SparkFun Library
File->Sketchbook->libraries->D1_mini_Examples->04.ShieldsAdafruit SSD1306 Library
NodeMCU Code:

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OLED Shield is a I2C screen 0.66" across.