The ESP8266 modules are so cheap who could resist experimenting with one. For about $8USD a few things you get are 9 GPIOs, I2C/SPI support, an ADC, and on board WiFi or other goodies. In addition ...
One uses the LiquidCrystal_I2C library (I²C display). The other uses the LiquidCrystal library (parallel display). In the code, set: USE_I2C = 1 for I²C displays (with LiquidCrystal_I2C) USE_I2C = 0 ...
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